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Chapter 296-841 WAC

 Last Update: 2/20/07

AIRBORNE CONTAMINANTS

WAC Sections

296-841-100 Scope.
296-841-200 Evaluate and control employee exposures.
296-841-20003 Employee protective measures.
296-841-20005 Exposure evaluations.
296-841-20010 Exposure controls.
296-841-20015 Respirators.
296-841-20020 Notification.
296-841-20025 Permissible exposure limits (PELs).
296-841-300 Definitions.

296-841-100
Scope.

  This chapter applies when your employees are, or could be, exposed to an airborne hazard.

     • The following are examples of airborne contaminants that may become airborne hazards in some workplaces:

     – Chemicals listed in Table 3, Permissible Exposure Limits (PELs) for Airborne Contaminants

     – Any substance:

     ▪ Listed in the latest edition of the NIOSH Registry of Toxic Effects of Chemical Substances

     ▪ For which positive evidence of an acute or chronic health hazard exists through tests conducted by, or known to, the employer

     ▪ That may pose a hazard to human health as stated on a material safety data sheet (MSDS) kept by, or known to, the employer

     – Biological agents such as harmful bacteria, viruses or fungi

     ▪ Examples include TB aerosols and anthrax

     – Pesticides

     – Chemicals used as crowd control agents, such as pepper spray

     – Chemicals present at clandestine drug labs.

     • Airborne contaminants exist in a variety of physical forms such as dusts, fibers, fogs, fumes, mists, gases, smoke, sprays, vapors, or aerosols.

     Definition:

     Exposed or exposure:

     The contact an employee has with a toxic substance, harmful physical agent or oxygen-deficient condition, whether or not protection is provided by respirators or other personal protective equipment (PPE). Exposure can occur through various routes of entry, such as inhalation, ingestion, skin contact, or skin absorption.



[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-100, filed 2/20/07, effective 4/1/07; 06-08-087, § 296-841-100, filed 4/4/06, effective 9/1/06; 05-17-168, § 296-841-100, filed 8/23/05, effective 1/1/06; 04-18-079, § 296-841-100, filed 8/31/04, effective 11/1/04; 03-20-115, § 296-841-100, filed 10/1/03, effective 1/1/04.]

296-841-200
Evaluate and control employee exposures.

  



[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-200, filed 2/20/07, effective 4/1/07; 03-20-115, § 296-841-200, filed 10/1/03, effective 1/1/04.]

296-841-20003
Employee protective measures.

  Protect employees from potentially hazardous exposure while you perform your exposure evaluation, using all available resources to determine adequate protective measures.


Note: • Resources include product labels, material safety data sheets (MSDSs), manufacturer recommendations, and industry protocols.




[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-20003, filed 2/20/07, effective 4/1/07.]

296-841-20005
Exposure evaluations.

  (1) Conduct an exposure evaluation to determine or reasonably estimate whether an employee is or could be exposed to either of the following:

     – An airborne contaminant above a permissible exposure limit (PEL) listed in Table 3;

     OR

     – Other airborne hazards, such as biological hazards.


Note: • When evaluating air contaminants, keep in mind that oxygen deficient conditions may also occur due to:
– Processes such as fermentation, decomposition of organic matter, or combustion of fossil fuels
– Displacement by another gas such as nitrogen or carbon dioxide
• Rules for specific substances may contain additional requirements for determining employee exposure
• Samples from a representative group of employees may be used for other employees performing the same work activities, when the duration and level of exposure are similar.

     (2) Conclude that an atmosphere is immediately dangerous to life or health (IDLH) when you cannot determine or reasonably estimate employee exposure.

     (3) Do all the following when you perform your evaluation:

     (a) Determine the form of the airborne contaminant, such as dust, mist, gas, or biological agent.

     (b) Make sure you don't use the amount of protection provided to employees by respirators as a factor in determining whether employees are exposed to an airborne hazard.

     (c) Make sure any air monitoring results used to determine employee exposures are based on personal air samples taken from, or representative of, the employee's breathing zone.

     ▪ You may use area sampling to screen for the presence of an airborne contaminant; however, results from area sampling can't be used if they don't adequately represent exposure of affected employees.

     (d) Include potential emergency and rescue situations that may occur, such as equipment or power failures, uncontrolled chemical reactions, fire, explosion, or human error.

     (e) Include workplace conditions such as work processes, types of material, exposure control methods, work practices, and environmental conditions.

     (f) Address extended work periods. For work shifts longer than eight hours, evaluate the continuous eight-hour portion of the shift expected to have the highest average exposure concentration.

     (4) Use either of the following types of documentation to conclusively demonstrate that employee exposure cannot meet or exceed any PEL for the airborne contaminant during any reasonably anticipated conditions:

     – Personal air samples that represent an employee's usual or worst-case exposure during the entire shift.

     OR

     – Specific information about products, materials, or activities that provides for an estimate of the level of employee exposure such as material safety data sheets (MSDSs), observations, previous air sampling results, other measurements, calculations, or pesticide labels.


Note: • You should use methods of sampling and analysis that have been validated by the laboratory performing the analysis.

     (5) Use the following formula to evaluate employee exposure to two or more substances that have additive health effects:


Em = C1

L1		 C2

L2		 ... Cn

Ln



The

symbol		 Is the . . .
E Equivalent exposure for the mixture. When the value of E is greater than 1, an airborne hazard is present.
C Concentration of a specific airborne contaminant.
L TWA8, STEL, or ceiling limit for that airborne contaminant, from Table 3, Permissible Exposure Limits (PELs) for Airborne Contaminants.

Note: • When results from your exposure evaluation indicate an airborne hazard, follow requirements in WAC 296-841-20010 through 296-841-20020 of this chapter.
• When changes occur that increase the level of exposure to an airborne hazard, you may need to conduct a new exposure evaluation to make sure exposure controls and other protective measures are sufficient.




[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-20005, filed 2/20/07, effective 4/1/07; 04-18-079, § 296-841-20005, filed 8/31/04, effective 11/1/04; 03-20-115, § 296-841-20005, filed 10/1/03, effective 1/1/04.]

296-841-20010
Exposure controls.

  

     IMPORTANT:

     • Respirators and other personal protective equipment are not exposure controls. Respirators may be used to protect employees while exposure controls are being installed or when it's not feasible to use exposure controls to remove or reduce the airborne hazard.

     (1) Use feasible exposure controls to reduce employee exposure to one of the following:

     – A level below the permissible exposure limits (PEL) in Table 3

     – A level that removes the airborne hazard, when no PEL is established

     – The lowest achievable level, when exposure cannot be reduced to below the PEL or the airborne hazard can't be removed.

     (2) Make sure exposure controls don't create or increase employee health hazards. For example, when ventilation systems are installed:

     – Prevent contaminated exhaust air from either:

     ▪ Reentering the building in harmful amounts

     or

     ▪ Exposing any employee to a health hazard.

     – Temper make-up air, when necessary

     – Prevent employee exposure to excessive air velocities.

     (3) Use make-up air systems that will not interfere with the effectiveness of the exhaust air system.

     – For example, make sure enough make-up air is provided to replace the amount of air exhausted.


Note: • Table 1 provides examples of possible exposure controls.


Table 1

Examples of Possible Controls
Preferred exposure controls include: For example:
Using a different chemical (this is also known as substitution) • Choose a chemical with a lower evaporation rate or vapor pressure
  • Choose a chemical that's not hazardous
Changing a process to decrease emissions • Use hand rolling or paint dipping instead of paint spraying
  • Bolt items instead of welding them
Separating employees from emissions areas and sources • Use control rooms
• Build an enclosure around process machinery or other emissions sources
  • Automate a process
Using local exhaust ventilation to remove emissions at or near the source • Install exhaust hoods or slots to capture emissions
  • Use an exhausted enclosure (like a blasting cabinet or laboratory hood)
Other exposure controls include: For example:
Using general exhaust ventilation to dilute and remove emissions in the work area • Allow natural air movement to create an adequate airflow through an area
Note: • Use mechanical fans
This isn't recommended for control of highly toxic airborne contaminants such as carcinogens, where low exposures can still present a health hazard  
Modifying work practices • Change the position of the employee relative to the work so fumes, vapors, or smoke aren't directed into the employee's face
Limiting the amount of time employees can spend in a contaminated area. • Establish a contaminant-free area for tasks such as prep work that don't need to be done in the exposure area
Implementing an employee rotation schedule Have employees alternate working in the exposure area so that each employee gets less overall exposure
Note:
This control will increase the number of employees exposed to the airborne contaminant. Due to this risk, employee rotation is NOT recommended for highly toxic airborne contaminants such as carcinogens, where low exposures can still present a health hazard.




[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-20010, filed 2/20/07, effective 4/1/07; 04-18-079, § 296-841-20010, filed 8/31/04, effective 11/1/04; 03-20-115, § 296-841-20010, filed 10/1/03, effective 1/1/04.]

296-841-20015
Respirators.

  Require employees to use respirators when airborne hazards have not been removed using feasible exposure controls. For example, use respirators at any of the following times:

     – While exposure controls are being evaluated or put in place

     – When the airborne hazard is not completely removed

     – When exposure controls are NOT feasible.



[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-20015, filed 2/20/07, effective 4/1/07; 03-20-115, § 296-841-20015, filed 10/1/03, effective 1/1/04.]

296-841-20020
Notification.

  Notify employees who are or may be exposed to airborne hazards, as specified in Table 2.


Note: • The notification may be provided either individually, to a group, or by posting of results in an appropriate location that is accessible to affected employees.


Table 2

Notification Requirements
Notify employees of: As follows:
Any exposure result above a permissible exposure limit (PEL) Within five business days, after the employee's exposure result is known to the employer
The corrective action being taken to reduce employee exposure to or below the PEL Within fifteen business days, after the employee's exposure result is known to the employer
AND  
The schedule for completion of the corrective action and any reasons why exposures cannot be lowered to below the PEL




[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-20020, filed 2/20/07, effective 4/1/07; 04-18-079, § 296-841-20020, filed 8/31/04, effective 11/1/04; 03-20-115, § 296-841-20020, filed 10/1/03, effective 1/1/04.]

296-841-20025
Permissible exposure limits (PELs).

  

     IMPORTANT:

     The following information applies to Table 3, Permissible Exposure Limits (PELs) for Airborne Contaminants.

     • Ppm refers to parts of vapor or gas per million parts of air by volume, at 25 degrees C and 760 mm Hg pressure.

     • Mg/m3 refers to milligrams of an airborne contaminant per cubic meter of air.

     • F/cc refers to fibers per cubic centimeter of air.

     • For a metal that is measured as the metal itself, only the CAS number for the metal is given. The CAS numbers for individual compounds of the metal are not provided. For more information about CAS registry numbers see the web site: http://www.cas.org.

     • Short-term exposure limits (STEL) pertain to fifteen-minute exposure periods, unless another time period is noted in Table 3.

     • An "X" in the "skin" column indicates the contaminant can be absorbed through the skin, either by airborne or direct contact.

     – Personal protective equipment (PPE) to prevent skin contact may be needed to minimize the risk for adverse health effects when employees are exposed to these chemicals.

     – Requirements for the use of gloves, coveralls, goggles, and other personal protective equipment can be found in WAC 296-800-160, Personal protective equipment (PPE).

     • Nuisance dusts (also known as inert dusts) are included in the Table 3 listing, particulates not otherwise regulated (PNOR).

     – The PNOR listing in Table 3 also applies to other particulate airborne contaminants for which a specific PEL is NOT listed unless the airborne contaminant is found to require a lower limit.

     • The respirable fraction of a particulate airborne contaminant is measured by sampling with a size-selector having the following characteristics:


Mean aerodynamic diameter in micrometers Percent passing the selector
1 97
2 91
3 74
4 50
5 30
6 17
7 9
8 5
10 1

Table 3 "Permissible Exposure Limits (PELs) for Airborne Contaminants"
Airborne contaminant CAS TWA8 STEL Ceiling Skin
Abate (Temephos) 3383-96-8 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Acetaldehyde 75-07-0 100 ppm 150 ppm ---- ----
Acetic acid 64-19-7 10 ppm 20 ppm ---- ----
Acetic anhydride 108-24-7 ---- ---- 5 ppm ----
Actinolite (asbestiform) (as asbestos)

     (see WAC 296-62-077 and

     chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Acetone 67-64-1 750 ppm 1,000 ppm ---- ----
Acetonitrile 75-05-8 40 ppm 60 ppm ---- ----
2-Acetylaminofluorene

     (see WAC 296-62-073)		 53-96-3 ---- ---- ---- ----
Acetylene 74-86-2 Simple asphyxiant ---- ---- ----
Acetylene dichloride

     (1,2-Dichloroethylene)		 540-59-0 200 ppm 250 ppm ---- ----
Acetylene tetrabromide 79-27-6 1 ppm 3 ppm ---- ----
Acetylsalicylic acid

     (Aspirin)		 50-78-2 5 mg/m3 10 mg/m3 ---- ----
Acrolein 107-02-8 0.1 ppm 0.3 ppm ---- ----
Acrylamide 79-06-1 0.03 mg/m3 0.09 mg/m3 ---- X
Acrylic acid 79-10-7 10 ppm 20 ppm ---- X
Acrylonitrile (Vinyl cyanide)

     (see WAC 296-62-07336)		 107-13-1 2 ppm 10 ppm ---- ----
Aldrin 309-00-2 0.25 mg/m3 0.75 mg/m3 ---- X
Allyl alcohol 107-18-6 2 ppm 4 ppm ---- X
Allyl chloride 107-05-1 1 ppm 2 ppm ---- ----
Allyl glycidyl ether (AGE) 106-92-3 5 ppm 10 ppm ---- ----
Allyl propyl disulfide 2179-59-1 2 ppm 3 ppm ---- ----
alpha-Alumina

     (Aluminum oxide)		 1344-28-1 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Aluminum (as Al) 7429-90-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
     Pyro powders ---- 5 mg/m3 10 mg/m3 ---- ----
     Welding fumes ---- 5 mg/m3 10 mg/m3 ---- ----
     Soluble salts ---- 2 mg/m3 4 mg/m3 ---- ----
     Alkyls (NOC) ---- 2 mg/m3 4 mg/m3 ---- ----
Aluminum oxide (Alundum,

     Corundum)		 7429-90-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
4-Aminodiphenyl

     (see WAC 296-62-073)		 92-67-1 ---- ---- ---- ----
2-Aminoethanol

     (Ethanolamine)		 141-43-5 3 ppm 6 ppm ---- ----
2-Aminopyridine 504-29-0 0.5 ppm 1.5 ppm ---- ----
Amitrole 61-82-5 0.2 mg/m3 0.6 mg/m3 ---- ----
Ammonia 7664-41-7 25 ppm 35 ppm ---- ----
Ammonium chloride, fume 12125-02-9 10 mg/m3 20 mg/m3 ---- ----
Ammonium sulfamate (Ammate) 7773-06-0 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5.0 mg/m3 10 mg/m3 ---- ----
Amosite (as asbestos)

     (see WAC 296-62-077 and

     and chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
n-Amyl acetate 628-63-7 100 ppm 150 ppm ---- ----
sec-Amyl acetate 626-38-0 125 ppm 156 ppm ---- ----
Aniline and homologues 62-53-3 2 ppm 4 ppm ---- X
Anisidine (o, p-isomers) 29191-52-4 0.1 ppm 0.3 ppm ---- X
Anthophyllite (asbestiform) (as

     asbestos)

     (see WAC 296-62-077 and

     chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Antimony and compounds (as Sb) 7440-36-0 0.5 mg/m3 1.5 mg/m3 ---- ----
ANTU

     (alpha Naphthyl thiourea)		 86-88-4 0.3 mg/m3 0.9 mg/m3 ---- ----
Argon 7440-37-1 Simple asphyxiant ---- ---- ----
Arsenic,

     organic compounds (as As)		 7440-38-2 0.2 mg/m3 0.6 mg/m3 ---- ----
Arsenic, inorganic

     compounds (as As) (when

     use is covered by chapter

     296-848 WAC)		 7440-38-2 0.01 mg/m3 ---- ---- ----
Arsenic, inorganic

     compounds (as As)

     (when use is not

     covered by chapter

     296-848 WAC)		 7440-38-2 0.2 mg/m3 0.6 mg/m3 ---- ----
Arsine 7784-42-1 0.05 ppm 0.15 ppm ---- ----
Asbestos

     (see WAC 296-62-077

     and chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Asphalt (Petroleum fumes) 8052-42-4 5 mg/m3 10 mg/m3 ---- ----
Atrazine 1912-24-9 5 mg/m3 10 mg/m3 ---- ----
Azinphos methyl (Guthion) 86-50-0 0.2 mg/m3 0.6 mg/m3 ---- X
Azodrin (Monocrotophos) 6923-22-4 0.25 mg/m3 0.75 mg/m3 ---- ----
Barium, soluble

     compounds (as Ba)		 7440-39-3 0.5 mg/m3 1.5 mg/m3 ---- ----
Barium sulfate 7727-43-7 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Baygon (Propoxur) 114-26-1 0.5 mg/m3 1.5 mg/m3 ---- ----
Benomyl 17804-35-2 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Benzene

     (see chapter 296-849 WAC)		 71-43-2 1 ppm 5 ppm ---- ----
Benzidine

     (see WAC 296-62-073)		 92-87-5 ---- ---- ---- ----
p-Benzoquinone

     (Quinone)		 106-51-4 0.1 ppm 0.3 ppm ---- ----
Benzo(a) pyrene

     (Coal tar pitch volatiles)		 65996-93-2 0.2 mg/m3 0.6 mg/m3 ---- ----
Benzoyl peroxide 94-36-0 5 mg/m3 10 mg/m3 ---- ----
Benzyl chloride 100-44-7 1ppm 3 ppm ---- ----
Beryllium and beryllium

     compounds (as Be)		 7440-41-7 0.002 mg/m3 0.005 mg/m3

(30 min.)		 0.025 mg/m3 ----
Biphenyl (Diphenyl) 92-52-4 0.2 ppm 0.6 ppm ---- ----
Bismuth telluride, undoped 1304-82-1 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Bismuth telluride, Se-doped ---- 5 mg/m3 10 mg/m3 ---- ----
Borates, tetra, sodium salts ---- ---- ---- ---- ----
     Anhydrous 1330-43-4 1 mg/m3 3 mg/m3 ---- ----
     Decahydrate 1303-96-4 5 mg/m3 10 mg/m3 ---- ----
     Pentahydrate 12179-04-3 1 mg/m3 3 mg/m3 ---- ----
Boron oxide 1303-86-2 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
Boron tribromide 10294-33-4 ---- ---- 1 ppm ----
Boron trifluoride 6737-07-2 ---- ---- 1 ppm ----
Bromacil 314-40-9 1 ppm 3 ppm ---- ----
Bromine 7726-95-6 0.1 ppm 0.3 ppm ---- ----
Bromine pentafluoride 7789-30-2 0.1 ppm 0.3 ppm ---- ----
Bromochloromethane

     (Chlorobromomthane)		 74-97-5 200 ppm 250 ppm ---- ----
Bromoform 15-25-2 0.5 ppm 1.5 ppm ---- X
Butadiene

     (1,3-butadiene)

     (see WAC 296-62-07460)		 106-99-0 1 ppm 5 ppm ---- ----
Butane 106-97-8 800 ppm 1,000 ppm ---- ----
Butanethiol

     (Butyl mercaptan)		 109-79-5 0.5 ppm 1.5 ppm ---- ----
2-Butanone

     (Methyl ethyl ketone)		 78-93-3 200 ppm 300 ppm ---- ----
2-Butoxy ethanol

     (Butyl cellosolve)		 111-76-2 25 ppm 38 ppm ---- X
n-Butyl acetate 123-86-4 150 ppm 200 ppm ---- ----
sec-Butyl acetate 105-46-4 200 ppm 250 ppm ---- ----
tert-Butyl acetate 540-88-5 200 ppm 250 ppm ---- ----
Butyl acrylate 141-32-2 10 ppm 20 ppm ---- ----
n-Butyl alcohol 71-36-3 ---- ---- 50 ppm X
sec-Butyl alcohol 78-92-2 100 ppm 150 ppm -- -- ----
tert-Butyl alcohol 75-65-0 100 ppm 150 ppm ---- ----
Butylamine 109-73-9 ---- ---- 5 ppm X
Butyl cellosolve (2-Butoxy ethanol) 111-76-2 25 ppm 38 ppm ---- ----
tert-Butyl chromate

     (as Cr)

     (see WAC 296-62-08003)		 1189-85-1 0.005 mg/m3 ---- 0.1 mg/m3 X
n-Butyl glycidyl ether (BGE) 2426-08-6 25 ppm 38 ppm ---- ----
n-Butyl lactate 138-22-7 5 ppm 10 ppm --- ----
Butyl mercaptan 109-79-5 0.5 ppm 1.5 ppm ---- ----
o-sec-Butylphenol 89-72-5 5 ppm 10 ppm ---- X
p-tert-Butyl-toluene 98-51-1 10 ppm 20 ppm ---- ----
Cadmium oxide fume (as Cd)

     (see WAC 296-62-074

     and 296-155-174)		 1306-19-0 0.005 mg/m3 ---- -- -- ----
Cadmium dust and salts (as Cd)

     (see WAC 296-62-074

     and 296-155-174)		 7440-43-9 0.005 mg/m3 ---- ---- ----
Calcium arsenate

     (see chapter 296-848 WAC)		 ---- 0.01 mg/m3 ---- ---- ----
Calcium carbonate 1317-65-3 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Calcium cyanamide 156-62-7 0.5 mg/m3 1.5 mg/m3 ---- ----
Calcium hydroxide 1305-62-0 5 mg/m3 10 mg/m3 ---- ----
Calcium oxide 1305-78-8 2 mg/m3 4 mg/m3 ---- ----
Calcium silicate 1344-95-2 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Calcium sulfate 7778-18-9 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Camphor (synthetic) 76-22-2 2 mg/m3 4 mg/m3 ---- ----
Caprolactam 105-60-2 ---- ---- ---- ----
     Dust ---- 1 mg/m3 3 mg/m3 ---- ----
     Vapor ---- 5 ppm 10 ppm ---- ----
Captafol

     (Difolatan)		 2425-06-1 0.1 mg/m3 0.3 mg/m3 ---- X
Captan 133-06-2 5 mg/m3 10 mg/m3 ---- ----
Carbaryl (Sevin) 63-25-2 5 mg/m3 10 mg/m3 ---- ----
Carbofuran (Furadon) 1563-66-2 0.1 mg/m3 0.3 mg/m3 ---- ----
Carbon black 1333-86-4 3.5 mg/m3 7 mg/m3 ---- ----
Carbon dioxide 124-38-9 5,000 ppm 30,000 ppm ---- ----
Carbon disulfide 75-15-0 4 ppm 12 ppm ---- X
Carbon monoxide 630-08-0 35 ppm 200 ppm (5 min.) 1,500 ppm ----
Carbon tetrabromide 558-13-4 0.1 ppm 0.3 ppm ---- ----
Carbon tetrachloride

     (Tetrachloromethane)		 56-23-5 2 ppm 4 ppm ---- X
Carbonyl chloride

     (Phosgene)		 7803-51-2 0.1 ppm 0.3 ppm ---- ----
Carbonyl fluoride 353-50-4 2 ppm 5 ppm ---- ----
Catechol (Pyrocatechol) 120-80-9 5 ppm 10 ppm ---- X
Cellosolve acetate

     (2-Ethoxyethylacetate)		 111-15-9 5 ppm 10 ppm ---- X
Cellulose (paper fiber) 9004-34-6 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Cesium hydroxide 21351-79-1 2 mg/m3 4 mg/m3 ---- ----
Chlordane 57-74-9 0.5 mg/m3 1.5 mg/m3 ---- X
Chlorinated camphene

     (Toxaphen)		 8001-35-2 0.5 mg/m3 1 mg/m3 ---- X
Chlorinated diphenyl oxide 55720-99-5 0.5 mg/m3 1.5 mg/m3 ---- ----
Chlorine 7782-50-5 0.5 ppm ---- 1 ppm ----
Chlorine dioxide 10049-04-4 0.1 ppm 0.3 ppm ---- ----
Chlorine trifluoride 7790-91-2 ---- ---- 0.1 ppm ----
Chloroacetaldehyde 107-20-0 ---- ---- 1 ppm ----
a-Chloroacetophenone

     (Phenacyl chloride)		 532-21-4 0.05 ppm 0.15 ppm ---- ----
Chloroacetyl chloride 79-04-9 0.05 ppm 0.15 ppm ---- ----
Chlorobenzene

     (Monochlorobenzene)		 108-90-7 75 ppm 113 ppm ---- ----
o-Chlorobenzylidene

     malononitrile (OCBM)		 2698-41-1 ---- ---- 0.05 ppm X
Chlorobromomethane 74-97-5 200 ppm 250 ppm ---- ----
2-Chloro-1, 3-butadiene

     (beta-Chloroprene)		 126-99-8 10 ppm 20 ppm ---- X
Chlorodifluoromethane 75-45-6 1,000 ppm 1,250 ppm ---- ----
Chlorodiphenyl

     (42% Chlorine) (PCB)

     (Polychlorobiphenyls)		 53469-21-9 1 mg/m3 3 mg/m3 ---- X
Chlorodiphenyl

     (54% Chlorine)

     (Polychlorobiphenyls

     (PCB))		 11097-69-1 0.5 mg/m3 1.5 mg/m3 ---- X
1-Chloro-2, 3-epoxypropane

     (Epichlorhydrin)		 106-89-8 2 ppm 4 ppm ---- X
2-Chloroethanol

     (Ethylene chlorohydrin)		 107-07-3 ---- ---- 1 ppm X
Chloroethylene

     (vinyl chloride)

     (See WAC 296-62-07329)		 75-01-4 1 ppm 5 ppm ---- ----
Chloroform (Trichloromethane) 67-66-3 2 ppm 4 ppm ---- ----
1-Chloro-1-nitropropane 600-25-9 2 ppm 4 ppm ---- ----
bis-Chloromethyl ether

     (see WAC 296-62-073)		 542-88-1 ---- ---- ---- ----
Chloromethyl methyl ether

     (Methyl chloromethyl

     ether)

     (see WAC 296-62-073)		 107-30-2 ---- ---- ---- ----
Chloropentafluoroethane 76-15-3 1,000 ppm 1,250 ppm ---- ----
Chloropicrin (Nitrotrichloromethane) 76-06-2 0.1 ppm 0.3 ppm ---- ----
beta-Chloroprene (2-Chloro-1,

     3-butadiene)		 126-99-8 10 ppm 20 ppm ---- X
o-Chlorostyrene 2039-87-4 50 ppm 75 ppm ---- ----
o-Chlorotoluene 95-49-8 50 ppm 75 ppm ---- ----
2-Chloro-6-trichloromethyl

     pyridine (Nitrapyrin)		 1929-82-4 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Chlorpyrifos 2921-88-2 0.2 mg/m3 0.6 mg/m3 ---- X
Chromic acid and chromates

     (as Cr)

     (when the compound is not

     covered by WAC

     296-62-08003)		 Varies with

compound		 ---- ---- 0.1 mg/m3 ----
Chromium ---- ---- ---- ---- ----
Chromium (VI) compounds

     (as Cr) (when the compound

     is covered by

     WAC 296-62-08003)		 ---- 0.005 mg/m3 ---- ---- ----
Chromium metal

     or Chromium (II) compounds

     Or

     Chromium (III) compounds		 7440-47-3 0.5 mg/m3 ---- ---- ----
Chromyl chloride (as Cr)

     (see WAC 296-62-08003)		 14977-61-8 0.005 mg/m3 ---- ---- ----
Chrysene (Coal tar

     pitch volatiles)		 65996-93-2 0.2 mg/m3 0.6 mg/m3 ---- ----
Chrysotile (as asbestos)

     (see WAC 296-62-077

     and chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Clopidol 2971-90-6 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Coal dust (less than 5% SiO2) ---- ---- ---- ---- ----
     Respirable fraction ---- 2 mg/m3 4 mg/m3 ---- ----
Coal dust (greater than or

     equal to 5% SiO2)		 ---- ---- ---- ---- ----
     Respirable fraction ---- 0.1 mg/m3 0.3 mg/m3 ---- ----
Coal tar pitch volatiles

     (benzene soluble fraction)

     Acridine

     Anthracene

     Benzo (a) pyrene

     Chrysene

     Phenanthrene

     Pyrene		 65996-93-2 0.2 mg/m3 0.6 mg/m3 ---- ----
Cobalt, metal fume & dust

     (as Co)		 7440-48-4 0.05 mg/m3 0.15 mg/m3 ---- ----
Cobalt carbonyl (as Co) 10210-68-1 0.1 mg/m3 0.3 mg/m3 ---- ----
Cobalt hydrocarbonyl (as Co) 16842-03-8 0.1 mg/m3 0.3 mg/m3 ---- ----
Coke oven emissions

     (see WAC 296-62-200)		 ---- 0.15 mg/m3 ---- ---- ----
Copper (as Cu) 7440-50-8 ---- ---- ---- ----
     Fume ---- 0.1 mg/m3 0.3 mg/m3 ---- ----
Dusts and mists ---- 1 mg/m3 3 mg/m3 ---- ----
Cotton dust (raw) (waste sorting, blending, cleaning, willowing and garetting) (see WAC 296-62-14533) ---- 1 mg/m3 ---- ---- ----
Corundum (Aluminum oxide) 7429-90-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Crag herbicide (Sesone, Sodium-2,

     4-dichloro-phenoxyethyl

     sulfate)		 136-78-7 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Cresol (all isomers) 1319-77-3 5 ppm 10 ppm ---- X
Crocidolite (as asbestos)

     (see WAC 296-62-077 and

     chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Crotonaldehyde

     		123-73-9;

4170-30-3		 2 ppm 4 ppm ---- ----
Crufomate 299-86-5 5 mg/m3 10 mg/m3 ---- ----
Cumene 98-82-8 50 ppm 75 ppm ---- X
Cyanamide 420-04-2 2 mg/m3 4 mg/m3 ---- ----
Cyanide (as CN) Varies with

compound		 5 mg/m3 10 mg/m3 ---- X
Cyanogen 460-19-5 10 ppm 20 ppm ---- ----
Cyanogen chloride 506-77-4 ---- ---- 0.3 ppm ----
Cyclohexane 110-82-7 300 ppm 375 ppm ---- ----
Cyclohexanol 108-93-0 50 ppm 75 ppm ---- X
Cyclohexanone 108-94-1 25 ppm 38 ppm ---- X
Cyclohexene 110-83-8 300 ppm 375 ppm ---- ----
Cyclohexylamine 108-91-8 10 ppm 20 ppm ---- ----
Cyclonite (RDX) 121-82-4 1.5 mg/m3 3.0 mg/m3 ---- X
Cyclopentadiene 542-92-7 75 ppm 113 ppm ---- ----
Cyclopentane 287-92-3 600 ppm 750 ppm ---- ----
Cyhexatin (Tricyclohexyltin

     hydroxide)		 13121-70-5 5 mg/m3 10 mg/m3 ---- ----
2,4-D (Dichlorophenoxy-

     acetic acid)		 94-75-7 10 mg/m3 20 mg/m3 ---- ----
DBCP (1,2-Dibromo-3-

     chloropropane)

     (See WAC 296-62-07342)		 96-12-8 0.001 ppm ---- 0.005 ppm ----
DDT (Dichlorodiphenyltri-

     chloroethane)		 50-29-3 1 mg/m3 3 mg/m3 ---- X
DDVP, (Dichlorvos) 62-73-7 0.1 ppm 0.3 ppm ---- X
Dasanit

     (Fensulfothion)		 115-90-2 0.1 mg/m3 0.3 mg/m3 ---- ----
Decaborane 17702-41-9 0.05 ppm 0.15 ppm ---- X
Demeton 8065-48-3 0.01 ppm 0.03 ppm ---- X
Diacetone alcohol

     (4-hydroxy-4-methyl-

     2-pentanone)		 123-42-2 50 ppm 75 ppm ---- ----
1, 2-Diaminoethane

     (Ethylenediamine)		 107-15-3 10 ppm 20 ppm ---- ----
Diazinon 333-41-5 0.1 mg/m3 0.3 mg/m3 ---- X
Diazomethane 334-88-3 0.2 ppm 0.6 ppm ---- ----
Diborane 19287-45-7 0.1 ppm 0.3 ppm ---- ----
Dibrom (see Naled) 300-76-5 3 mg/m3 6 mg/m3 ---- X
1, 2-Dibromo-3-chloropropane

     (DBCP)

     (see WAC

     296-62-07342)		 96-12-8 0.001 ppm ---- 0.005 ppm ----
2-N-Dibutylamino ethanol 102-81-8 2 ppm 4 ppm ---- X
Dibutyl phosphate 107-66-4 1 ppm 2 ppm ---- ----
Dibutyl phthalate 84-74-2 5 mg/m3 10 mg/m3 ---- ----
Dichloroacetylene 7572-29-4 ---- ----- 0.1 ppm ----
o-Dichlorobenzene 95-50-1 ---- ---- 50 ppm ----
p-Dichlorobenzene 106-46-7 75 ppm 110 ppm ---- ----
3, 3'-Dichlorobenzidine

     (see WAC 296-62-073)		 91-94-1 ---- ---- ---- ----
Dichlorodiphenyltri-

     chloroethane (DDT)		 50-29-3 1 mg/m3 3 mg/m3 ---- X
Dichlorodifluoromethane 75-71-8 1,000 ppm 1,250 ppm ---- ----
1, 3-Dichloro-5, 5-dimethyl

     hydantoin		 118-52-5 0.2 mg/m3 0.4 mg/m3 ---- ----
1, 1-Dichloroethane

     (Ethylidine chloride)		 75-34-3 100 ppm 150 ppm ---- ----
1, 2-Dichloroethane

     (Ethylene dichloride)		 107-06-2 1 ppm 2 ppm ---- ----
1, 1-Dichloroethylene

     (Vinylidene chloride)		 75-35-4 1 ppm 3 ppm ---- ----
1, 2-Dichloroethylene (Acetylene

     dichloride)		 540-59-0 200 ppm 250 ppm ---- ----
Dichloroethyl ether 111-44-4 5 ppm 10 ppm ---- X
Dichlorofluoromethane 75-43-4 10 ppm 20 ppm ---- ----
Dichloromethane

     (Methylene chloride)

     (See chapter 296-859 WAC)		 75-09-2 25 ppm 125 ppm ---- ----
1, 1-Dichloro-1-nitroethane 594-72-9 2 ppm 10 ppm ---- ----
Dichlorophenoxyacetic acid

     (2, 4-D)		 94-75-7 10 mg/m3 20 mg/m3 ---- ----
1, 2-Dichloropropane

     (Propylene dichloride)		 78-87-5 75 ppm 110 ppm ---- ----
Dichloropropene 542-75-6 1 ppm 3 ppm ---- X
2, 2-Dichloropropionic acid 75-99-0 1 ppm 3 ppm ---- ----
Dichlorotetrafluoroethane 76-14-2 1,000 ppm 1,250 ppm ---- ----
Dichlorvos (DDVP) 62-73-7 0.1 ppm 0.3 ppm ---- X
Dicrotophos 141-66-2 0.25 mg/m3 0.75 mg/m3 ---- X
Dicyclopentadiene 77-73-6 5 ppm 10 ppm ---- ----
Dicyclopentadienyl iron 102-54-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Dieldrin 60-57-1 0.25 mg/m3 0.75 mg/m3 ---- X
Diethanolamine 111-42-2 3 ppm 6 ppm ---- ----
Diethylamine 109-89-7 10 ppm 25 ppm ---- ----
2-Diethylaminoethanol 100-37-8 10 ppm 20 ppm ---- X
Diethylene triamine 111-40-0 1 ppm 3 ppm ---- X
Diethyl ether (Ethyl ether) 60-29-7 400 ppm 500 ppm ---- ----
Diethyl ketone 96-22-0 200 ppm 250 ppm ---- ----
Diethyl phthalate 84-66-2 5 mg/m3 10 mg/m3 ---- ----
Difluorodibromomethane 75-61-6 100 ppm 150 ppm ---- ----
Difolatan (Captafol) 2425-06-1 0.1 mg/m3 0.3 mg/m3 ---- X
Diglycidyl ether (DGE) 2238-07-5 0.1 ppm 0.3 ppm ---- ----
Dihydroxybenzene

     (Hydroquinone)		 123-31-9 2 mg/m3 4 mg/m3 -- -- ----
Diisobutyl ketone (2, 6-

     Dimethylheptanone)		 108-83-8 25 ppm 38 ppm ---- ----
Diisopropylamine 108-18-9 5 ppm 10 ppm ---- X
Dimethoxymethane (Methylal) 109-87-5 1,000 ppm 1,250 ppm ---- ----
Dimethyl acetamide 127-19-5 10 ppm 20 ppm ---- X
Dimethylamine 124-40-3 10 ppm 20 ppm ---- ----
4-Dimethylaminoazo benzene

     (see WAC 296-62-073)		 60-11-7 ---- ---- ---- ----
Dimethylaminobenzene

     (Xylidene)		 1300-73-8 2 ppm 4 ppm ---- X
Dimethylaniline

     (N, N-Dimethylaniline)		 121-69-7 5 ppm 10 ppm ---- X
Dimethylbenzene (Xylene) 1300-73-8 100 ppm 150 ppm ---- ----
Dimethyl-1, 2-dibromo-2,

     2-dichloroethyl phosphate

     (Naled)		 300-76-5 3 mg/m3 6 mg/m3 ---- X
Dimethylformamide 68-12-2 10 ppm 20 ppm ---- X
2, 6-Dimethylheptanone

     (Diisobutyl ketone)		 108-83-8 25 ppm 38 ppm ---- ----
1, 1-Dimethylhydrazine 57-14-7 0.5 ppm 1.5 ppm ---- X
Dimethyl phthalate 131-11-3 5 mg/m3 10 mg/m3 ---- ----
Dimethyl sulfate 77-78-1 0.1 ppm 0.3 ppm ---- X
Dinitolmide

     (3, 5-Dinitro-o-toluamide)		 148-01-6 5 mg/m3 10 mg/m3 ---- ----
Dinitrobenzene (all isomers -

     alpha, meta and para)		 528-29-0;

99-65-0;

100-25-4		 0.15 ppm 0.45 ppm ---- X
Dinitro-o-cresol 534-52-1 0.2 mg/m3 0.6 mg/m3 ---- X
3, 5-Dinitro-o-toluamide

     (Dinitolmide)		 148-01-6 5 mg/m3 10 mg/m3 ---- ----
Dinitrotoluene 25321-14-6 1.5 mg/m3 3 mg/m3 ---- X
Dioxane (Diethylene dioxide) 123-91-1 25 ppm 38 ppm ---- X
Dioxathion 78-34-2 0.2 mg/m3 0.6 mg/m3 ---- X
Diphenyl (Biphenyl) 92-52-4 0.2 ppm 0.6 ppm ---- ----
Diphenylamine 122-39-4 10 mg/m3 20 mg/m3 ---- ----
Diphenylmethane diisocyanate

     (Methylene bisphenyl           isocyanate (MDI))		 101-68-8 ---- ---- 0.02 ppm ----
Dipropylene glycol methyl ether 34590-94-8 100 ppm 150 ppm ---- X
Dipropyl ketone 123-19-3 50 ppm 75 ppm ---- ----
Diquat 85-00-7 0.5 mg/m3 1.5 mg/m3 ---- ----
Di-sec, Octyl phthalate

     (Di-2-ethylhexylphthalate)		 117-81-7 5 mg/m3 10 mg/m3 ---- ----
Disulfram 97-77-8 2 mg/m3 4 mg/m3 ---- ----
Disulfoton 298-04-4 0.1 mg/m3 0.3 mg/m3 ---- X
2, 6-Di-tert-butyl-p-cresol 128-37-0 10 mg/m3 20 mg/m3 ---- ----
Diuron 330-54-1 10 mg/m3 20 mg/m3 ---- ----
Divinyl benzene 1321-74-0 10 ppm 20 ppm ---- ----
Emery 12415-34-8 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Endosulfan (Thiodan) 115-29-7 0.1 mg/m3 0.3 mg/m3 ---- X
Endrin 72-20-8 0.1 mg/m3 0.3 mg/m3 ---- X
Epichlorhydrin (1-Chloro-2,

     3-epoxypropane)		 106-89-8 2 ppm 4 ppm ---- X
EPN 2104-64-5 0.5 mg/m3 1.5 mg/m3 ---- X
1, 2-Epoxypropane

     (Propylene oxide)		 75-56-9 20 ppm 30 ppm ---- ----
2, 3-Epoxy-1-propanol

     (Glycidol)		 556-52-5 25 ppm 38 ppm ---- ----
Ethane ---- Simple asphyxiant ---- ---- ----
Ethanethiol

     (Ethyl mercaptan)		 75-08-1 0.5 ppm 1.5 ppm ---- ----
Ethanol

     (Ethyl alcohol)		 64-17-5 1,000 ppm 1,250 ppm ---- ----
Ethanolamine (2-Aminoethanol) 141-43-5 3 ppm 6 ppm ---- ----
Ethion 563-12-2 0.4 mg/m3 1.2 mg/m3 ---- X
2-Ethoxyethanol (Glycol

     monoethyl ether)		 110-80-5 5 ppm 10 ppm ---- X
2-Ethoxyethyl acetate

     (Cellosolve acetate)		 111-15-9 5 ppm 10 ppm ---- X
Ethyl acetate 141-78-6 400 ppm 500 ppm ---- ----
Ethyl acrylate 140-88-5 5 ppm 25 ppm ---- X
Ethyl alcohol (ethanol) 64-17-5 1,000 ppm 1,250 ppm ---- ----
Ethylamine 75-04-07 10 ppm 20 ppm ---- ----
Ethyl amyl ketone

     (5-Methyl-3-hepatone)		 541-85-5 25 ppm 38 ppm ---- ----
Ethyl benzene 100-41-4 100 ppm 125 ppm ---- ----
Ethyl bromide 74-96-4 200 ppm 250 ppm ---- ----
Ethyl butyl ketone

     (3-Heptanone)		 106-35-4 50 ppm 75 ppm ---- ----
Ethyl chloride 75-00-3 1,000 ppm 1,250 ppm ---- ----
Ethylene 74-85-1 Simple asphyxiant ---- ---- ----
Ethylene chlorohydrin

     (2-Chloroethanol)		 107-07-3 ---- ---- 1 ppm X
Ethylenediamine (1,2-

     Diaminoethane)		 107-15-3 10 ppm 20 ppm ---- X
Ethylene dibromide 106-93-4 0.1 ppm 0.5 ppm ---- ----
Ethylene dichloride

     (1,2-Dichloroethane)		 107-06-2 1 ppm 2 ppm ---- ----
Ethylene glycol 107-21-1 ---- ---- 50 ppm ----
Ethylene glycol dinitrate 628-96-6 ---- 0.1 mg/m3 ---- X
Ethylene glycol monomethyl ether

     acetate (Methyl cellosolve           acetate)		 ---- 5 ppm 10 ppm ---- X
Ethyleneimine

     (see WAC 296-62-073)		 151-56-4 ---- ---- ---- X
Ethylene oxide

     (see chapter 296-855 WAC)		 75-21-8 1 ppm 5 ppm ---- ----
Ethyl ether (Diethyl ether) 60-29-7 400 ppm 500 ppm ---- ----
Ethyl formate 109-94-4 100 ppm 125 ppm ---- ----
Ethylidine chloride

     (1, 1-Dichloroethane)		 107-06-2 1 ppm 2 ppm ---- ----
Ethylidene norbornene 16219-75-3 ---- ---- 5.0 ppm ----
Ethyl mercaptan (Ethanethiol) 75-08-1 0.5 ppm 1.5 ppm ---- ----
n-Ethylmorpholine 100-74-3 5 ppm 10 ppm ---- X
Ethyl sec-amyl ketone

     (5-methyl-3-heptanone)		 541-85-5 25 ppm 38 ppm ---- ----
Ethyl silicate 78-10-4 10 ppm 20 ppm ---- ----
Fenamiphos 22224-92-6 0.1 mg/m3 0.3 mg/m3 ---- X
Fensulfothion (Dasanit) 115-90-2 0.1 mg/m3 0.3 mg/m3 ---- ----
Fenthion 55-38-9 0.2 mg/m3 0.6 mg/m3 ---- X
Ferbam ---- ---- ---- ---- ----
     Total particulate 14484-64-1 10 mg/m3 20 mg/m3 ---- ----
Ferrovanadium dust 12604-58-9 1 mg/m3 3 mg/m3 ---- ----
Fluorides (as F) Varies with

compound		 2.5 mg/m3 5 mg/m3 ---- ----
Fluorine 7782-41-4 0.1 ppm 0.3 ppm ---- ----
Fluorotrichloromethane

     (see Trichlorofluoro methane)		 75-69-4 ---- ---- 1,000 ppm ----
Fonofos 944-22-9 0.1 mg/m3 0.3 mg/m3 ---- X
Formaldehyde

     (see chapter 296-856 WAC)		 50-00-0 0.75 ppm 2 ppm ---- ----
Formamide 75-12-7 20 ppm 30 ppm ---- ----
Formic acid 64-18-6 5 ppm 10 ppm ---- ----
Furadon

     (carbofuran)		 1563-66-2 0.1 mg/m3 0.3 mg/m3 ---- ----
Furfural 98-01-1 2 ppm 4 ppm ---- X
Furfuryl alcohol 98-00-0 10 ppm 15 ppm ---- X
Gasoline 8006-61-9 300 ppm 500 ppm ---- ----
Germanium tetrahydride 7782-65-2 0.2 ppm 0.6 ppm ---- ----
Glass, fibrous or dust ---- 10 mg/m3 20 mg/m3 ---- ----
Glutaraldehyde 111-30-8 ---- ---- 0.2 ppm ----
Glycerin mist 56-81-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Glycidol

     (2, 3-Epoxy-1-propanol)		 556-52-5 25 ppm 38 ppm ---- ----
Glycol monoethyl ether

     (2-Ethoxyethanol)		 110-80-5 5 ppm 10 ppm ---- X
Grain dust (oat, wheat, barley) ---- 10 mg/m3 20 mg/m3 ---- ----
Graphite, natural 7782-42-5 ---- ---- ---- ----
     Respirable particulate ---- 2.5 mg/m3 5 mg/m3 ---- ----
Graphite, synthetic ---- ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Guthion

     (Azinphosmethyl)		 86-50-0 0.2 mg/m3 0.6 mg/m3 ---- X
Gypsum 13397-24-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Hafnium 7440-58-6 0.5 mg/m3 1.5 mg/m3 ---- ----
Helium ---- Simple asphyxiant ---- ---- ----
Heptachlor 76-44-8 0.5 mg/m3 1.5 mg/m3 ---- X
Heptane (n-heptane) 142-82-5 400 ppm 500 ppm ---- ----
2-Heptanone

     (Methyl n-amyl ketone)		 110-43-0 50 ppm 75 ppm ---- ----
3-Heptanone

     (Ethyl butyl ketone)		 106-35-4 50 ppm 75 ppm ---- ----
Hexachlorobutadiene 87-68-3 0.02 ppm 0.06 ppm ---- X
Hexachlorocyclopentadiene 77-47-4 0.01 ppm 0.03 ppm ---- ----
Hexachloroethane 67-72-1 1 ppm 3 ppm ---- X
Hexachloronaphthalene 1335-87-1 0.2 mg/m3 0.6 mg/m3 ---- X
Hexafluoroacetone 684-16-2 0.1 ppm 0.3 ppm ---- X
Hexane ---- ---- ---- ---- ----
     n-hexane 110-54-3 50 ppm 75 ppm ---- ----
     other isomers Varies with

compound		 500 ppm 1,000 ppm ---- ----
2-Hexanone

     (Methyl-n-butyl ketone)		 591-78-6 5 ppm 10 ppm ---- ----
Hexone

     (Methyl isobutyl ketone)		 108-10-1 50 ppm 75 ppm ---- ----
sec-Hexyl acetate 108-84-9 50 ppm 75 ppm ---- ----
Hexylene glycol 107-41-5 ---- ---- 25 ppm ----
Hydrazine 302-01-2 0.1 ppm 0.3 ppm ---- X
Hydrogen ---- Simple asphyxiant ---- ---- ----
Hydrogenated terphenyls 61788-32-7 0.5 ppm 1.5 ppm ---- ----
Hydrogen bromide 10035-10-6 ---- ---- 3.0 ppm ----
Hydrogen chloride 7647-01-0 ---- ---- 5.0 ppm ----
Hydrogen cyanide 74-90-8 ---- 4.7 ppm ---- X
Hydrogen fluoride 7664-39-3 ---- ---- 3 ppm ----
Hydrogen peroxide 7722-84-1 1 ppm 3 ppm ---- ----
Hydrogen selenide (as Se) 7783-07-5 0.05 ppm 0.15 ppm ---- ----
Hydrogen sulfide 7783-06-4 10 ppm 15 ppm ---- ----
Hydroquinone

     (Dihydroxybenzene)		 123-31-9 2 mg/m3 4 mg/m3 ---- ----
4-Hydroxy-4-methyl-2-pentanone

     (Diacetone alcohol)		 123-42-2 50 ppm 75 ppm ---- ----
2-Hydroxypropyl acrylate 99-61-1 0.5 ppm 1.5 ppm ---- X
Indene 95-13-6 10 ppm 20 ppm ---- ----
Indium and compounds (as In) 7440-74-6 0.1 mg/m3 0.3 mg/m3 ---- ----
Iodine 7553-56-2 ---- ---- 0.1 ppm ----
Iodoform 75-47-8 0.6 ppm 1.8 ppm ---- ----
Iron oxide dust and fume (as Fe) 1309-37-1 ---- ---- ---- ----
     Total particulate ---- 5 mg/m3 10 mg/m3 ---- ----
Iron pentacarbonyl (as Fe) 13463-40-6 0.1 ppm 0.2 ppm ---- ----
Iron salts, soluble (as Fe) Varies with

compound		 1 mg/m3 3 mg/m3 ---- ----
Isoamyl acetate 123-92-2 100 ppm 150 ppm ---- ----
Isoamyl alcohol

     (primary and secondary)		 123-51-3 100 ppm 125 ppm ---- ----
Isobutyl acetate 110-19-0 150 ppm 188 ppm ---- ----
Isobutyl alcohol 78-83-1 50 ppm 75 ppm ---- ----
Isooctyl alcohol 26952-21-6 50 ppm 75 ppm ---- X
Isophorone 78-59-1 4 ppm ---- 5 ppm ----
Isophorone diisocyanate 4098-71-9 0.005 ppm 0.02 ppm ---- X
Isopropoxyethanol 109-59-1 25 ppm 38 ppm ---- ----
Isopropyl acetate 108-21-4 250 ppm 310 ppm ---- ----
Isopropyl alcohol 67-63-0 400 ppm 500 ppm ---- ----
Isopropylamine 75-31-0 5 ppm 10 ppm ---- ----
N-Isopropylaniline 768-52-5 2 ppm 4 ppm ---- X
Isopropyl ether 108-20-3 250 ppm 313 ppm ---- ----
Isopropyl glycidyl ether (IGE) 4016-14-2 50 ppm 75 ppm ----- ----
Kaolin ---- ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Ketene 463-51-4 0.5 mg/m3 1.5 mg/m3 ---- ----
Lannate

     (Methomyl)		 16752-77-5 2.5 mg/m3 5 mg/m3 ---- ----
Lead, inorganic (as Pb)

     (see WAC 296-62-07521

     and 296-155-176)		 7439-92-1 0.05 mg/m3 ---- ---- ----
Lead arsenate (as Pb)

     (see WAC 296-62-07521,

     296-155-176, and chapter

     296-848 WAC)		 3687-31-8 0.05 mg/m3 ---- ---- ----
Lead chromate (as Pb)

     (see WAC 296-62-08003,

     296-62-07521, and

     296-155-176)		 7758-97-6 0.05 mg/m3 ---- ---- ----
Limestone 1317-65-3 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Lindane 58-89-9 0.5 mg/m3 1.5 mg/m3 ---- X
Lithium hydride 7580-67-8 0.025 mg/m3 0.075 mg/m3 ---- ----
L.P.G.

     (liquified petroleum gas)		 68476-85-7 1,000 ppm 1,250 ppm ---- ----
Magnesite 546-93-0 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Magnesium oxide fume 1309-48-4 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
Malathion 121-75-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- X
Maleic anhydride 108-31-6 0.25 ppm 0.75 ppm ---- ----
Manganese and compounds (as Mn) 7439-96-5 ---- ---- 5 mg/m3 ----
Manganese cyclopentadienyl

     tricarbonyl (as Mn)		 12079-65-1 0.1 mg/m3 0.3 mg/m3 ---- X
Manganese tetroxide and

     fume (as Mn)		 7439-96-5 1 mg/m3 3 mg/m3 ---- ----
Marble 1317-65-3 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
MBOCA

     (4, 4'-Methylene bis

     (2-chloro-aniline))

     (see WAC 296-62-073)		 101-14-4 ---- ---- ---- X
MDA

     (4, 4-Methylene dianiline)

     (see WAC 296-62-076

     and 296-155-173)		 101-77-9 0.01 ppm 0.1 ppm ---- X
MDI

     (Methylene bisphenyl

     isocyanate)

     (Diphenylmethane

     diisocyanate)		 101-68-8 ---- ---- 0.02 ppm ----
MEK

     (Methyl ethyl ketone)

     (2-Butanone)		 78-93-3 200 ppm 300 ppm ---- ----
MEKP

     (Methyl ethyl ketone peroxide)		 1338-23-4 ---- ---- 0.2 ppm ----
Mercury (as Hg) 7439-97-6 ---- ---- ---- ----
     Aryl and inorganic ---- 0.1 mg/m3 0.3 mg/m3 ---- X
     Organo-alkyl compounds ---- 0.01 mg/m3 0.03 mg/m3 ---- X
     Vapor ---- 0.05 mg/m3 0.15 mg/m3 ---- X
Mesityl oxide 141-79-7 15 ppm 25 ppm ---- ----
Methacrylic acid 79-41-4 20 ppm 30 ppm ---- X
Methane ---- Simple asphyxiant ---- ---- ----
Methanethiol

     (Methyl mercaptan)		 74-93-1 0.5 ppm 1.5 ppm ---- ----
Methanol

     (Methyl alcohol)		 67-56-1 200 ppm 250 ppm ---- X
Methomyl (lannate) 16752-77-5 2.5 mg/m3 5 mg/m3 ---- ----
Methoxychlor 72-43-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
2-Methoxyethanol

     (Methyl cellosolve)		 109-86-4 5 ppm 10 ppm ---- X
2-Methoxyethyl acetate

     (Methyl cellosolve acetate)		 110-49-6 5 ppm 10 ppm ---- X
4-Methoxyphenol 150-76-5 5 mg/m3 10 mg/m3 ---- ----
Methyl acetate 79-20-9 200 ppm 250 ppm ---- ----
Methyl acetylene (propyne) 74-99-7 1,000 ppm 1,250 ppm ---- ----
Methyl acetylene-propadiene

     mixture (MAPP)		 ---- 1,000 ppm 1,250 ppm ---- ----
Methyl acrylate 96-33-3 10 ppm 20 ppm ---- X
Methylacrylonitrile 126-98-7 1 ppm 3 ppm ---- X
Methylal (Dimethoxy-methane) 109-87-5 1,000 ppm 1,250 ppm ---- ----
Methyl alcohol (methanol) 67-56-1 200 ppm 250 ppm ---- X
Methylamine 74-89-5 10 ppm 20 ppm ---- ----
Methyl amyl alcohol

     (Methyl isobutyl carbinol)		 108-11-2 25 ppm 40 ppm ---- X
Methyl n-amyl ketone

     (2-Heptanone)		 110-43-0 50 ppm 75 ppm ---- ----
N-Methyl aniline

     (Monomethyl aniline)		 100-61-8 0.5 ppm 1.5 ppm ---- X
Methyl bromide 74-83-9 5 ppm 10 ppm ---- X
Methyl-n-butyl ketone

     (2-Hexanone)		 591-78-6 5 ppm 10 ppm ---- ----
Methyl cellosolve

     (2-Methoxyethanol)		 109-86-4 5 ppm 10 ppm ---- X
Methyl cellosolve acetate

     (2-Methoxyethyl acetate)		 110-49-6 5 ppm 10 ppm ---- X
Methyl chloride 74-87-3 50 ppm 100 ppm ---- ----
Methyl chloroform

     (1, 1, 1-trichlorethane)		 71-55-6 350 ppm 450 ppm ---- ----
Methyl chloromethyl ether

     (chloromethyl methyl

     ether)

     (see WAC 296-62-073)		 107-30-2 ---- ---- ---- ----
Methyl 2-cyanoacrylate 137-05-3 2 ppm 4 ppm ---- ----
Methylcyclohexane 108-87-2 400 ppm 500 ppm ---- ----
Methylcyclohexanol 25639-42-3 50 ppm 75 ppm ---- ----
Methylcyclohexanone 583-60-8 50 ppm 75 ppm ---- X
Methylcyclopentadienyl

     manganese tricarbonyl (as           Mn)		 12108-13-3 0.2 mg/m3 0.6 mg/m3 ---- X
Methyl demeton 8022-00-2 0.5 mg/m3 1.5 mg/m3 ---- X
Methylene bisphenyl isocyanate

     (MDI)

     (Diphenylmethane                     diisocyanate)		 101-68-8 ---- ---- 0.02 ppm ----
4, 4'-Methylene bis

     (2-chloro-aniline) (MBOCA)

     (see WAC 296-62-073)		 101-14-4 ---- ---- ---- X
Methylene bis

     (4-cyclohexylisocyanate)		 5124-30-1 ---- ---- 0.01 ppm ----
Methylene chloride

     (Dichloromethane)

     (see chapter 296-859 WAC)		 75-09-2 25 ppm 125 ppm ---- ----
4, 4-Methylene dianiline (MDA)

     (see WAC 296-62-076

     and 296-155-173)		 101-77-9 0.01 ppm 0.1 ppm ---- X
Methyl ethyl ketone (MEK)

     (2-Butanone)		 78-93-3 200 ppm 300 ppm ---- ----
Methyl ethyl ketone peroxide

     (MEKP)		 1338-23-4 ---- ---- 0.2 ppm ----
Methyl formate 107-31-3 100 ppm 150 ppm ---- ----
5-Methyl-3-heptanone

     (Ethyl amyl ketone)		 541-85-5 25 ppm 38 ppm ---- ----
Methyl hydrazine

     (Monomethyl hydrazine)		 60-34-4 ---- ---- 0.2 ppm X
Methyl iodide 74-88-4 2 ppm 4 ppm ---- X
Methyl isoamyl ketone 110-12-3 50 ppm 75 ppm ---- ----
Methyl isobutyl carbinol

     (Methyl amyl alcohol)		 108-11-2 25 ppm 40 ppm ---- X
Methyl isobutyl ketone

     (Hexone)		 108-10-1 50 ppm 75 ppm ---- ----
Methyl isocyanate 624-83-9 0.02 ppm 0.06 ppm ---- X
Methyl isopropyl ketone 563-80-4 200 ppm 250 ppm ---- ----
Methyl mercaptan (Methanethiol) 74-93-1 0.5 ppm 1.5 ppm ---- ----
Methyl methacrylate 80-62-6 100 ppm 150 ppm ---- ----
Methyl parathion 298-00-0 0.2 mg/m3 0.6 mg/m3 ---- X
Methyl propyl ketone

     (2-Pentanone)		 107-87-9 200 ppm 250 ppm ---- ----
Methyl silicate 684-84-5 1 ppm 3 ppm ---- ----
alpha-Methyl styrene 98-83-9 50 ppm 100 ppm ---- ----
Mevinphos (Phosdrin) 7786-34-7 0.01 ppm 0.03 ppm ---- X
Metribuzin 21087-64-9 5 mg/m3 10 mg/m3 ---- ----
Mica (Silicates)

     Respirable fraction		 12001-26-2 3 mg/m3 6 mg/m3 ---- ----
Molybdenum (as Mo) 7439-98-7 ---- ---- ---- ----
     Soluble compounds ---- 5 mg/m3 10 mg/m3 ---- ----
     Insoluble compounds ---- 10 mg/m3 20 mg/m3 ---- ----
Monochlorobenzene

     (Chlorobenzene)		 108-90-7 75 ppm 113 ppm ---- ----
Monocrotophos (Azodrin) 6923-22-4 0.25 mg/m3 0.75 mg/m3 ---- ----
Monomethyl aniline

     (N-Methyl aniline)		 100-61-8 0.5 ppm 1.5 ppm ---- X
Monomethyl hydrazine ---- ---- ---- 0.2 ppm ----
Morpholine 110-91-8 20 ppm 30 ppm ---- X
Naled (Dibrom) 300-76-5 3 mg/m3 6 mg/m3 ---- X
Naphtha 8030-30-6 100 ppm 150 ppm ---- X
Naphthalene 91-20-3 10 ppm 15 ppm ---- ----
alpha-Naphthylamine

     (see WAC 296-62-073)		 134-32-7 ---- ---- ---- ----
beta-Naphthylamine

     (see WAC 296-62-073)		 91-59-8 ---- ---- ---- ----
Neon 7440-01-9 Simple asphyxiant ---- ---- ----
Nickel carbonyl (as Ni) 13463-39-3 0.001 ppm 0.003 ppm ---- ----
Nickel (as Ni) 7440-02-0 ---- ---- ---- ----
     Metal and insoluble

     compounds		 ---- 1 mg/m3 3 mg/m3 ---- ----
     Soluble compounds ---- 0.1 mg/m3 0.3 mg/m3 ---- ----
Nicotine 54-11-5 0.5 mg/m3 1.5 mg/m3 ---- X
Nitrapyrin

     (2-Chloro-6

     trichloromethyl pyridine)		 1929-82-4 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Nitric acid 7697-37-2 2 ppm 4 ppm ---- ----
Nitric oxide 10102-43-9 25 ppm 38 ppm ---- ----
p-Nitroaniline 100-01-6 3 mg/m3 6 mg/m3 ---- X
Nitrobenzene 98-95-3 1 ppm 3 ppm ---- X
4-Nitrobiphenyl

     (see WAC 296-62-073)		 92-93-3 ---- ---- ---- ----
p-Nitrochlorobenzene 100-00-5 0.5 mg/m3 1.5 mg/m3 ---- X
4-Nitrodiphenyl

     (see WAC 296-62-073)		 ---- ---- ---- ---- ----
Nitroethane 79-24-3 100 ppm 150 ppm ---- ----
Nitrogen 7727-37-9 Simple asphyxiant ---- ---- ----
Nitrogen dioxide 10102-44-0 ---- 1 ppm ---- ----
Nitrogen oxide

     (Nitrous oxide)		 10024-97-2 50 ppm 75 ppm ---- ----
Nitrogen trifluoride 7783-54-2 10 ppm 20 ppm ---- ----
Nitroglycerin 55-63-0 ---- 0.1 mg/m3 ---- X
Nitromethane 75-52-5 100 ppm 150 ppm ---- ----
1-Nitropropane 108-03-2 25 ppm 38 ppm ---- ----
2-Nitropropane 79-46-9 10 ppm 20 ppm ---- ----
N-Nitrosodimethylamine

     (see WAC 296-62-073)		 62-75-9 ---- ---- ---- ----
Nitrotoluene ---- ---- ---- ---- ----
     o-isomer 88-72-2 2 ppm 4 ppm ---- X
     m-isomer 98-08-2 2 ppm 4 ppm ---- X
     p-isomer 99-99-0 2 ppm 4 ppm ---- X
Nitrotrichloromethane

     (Chloropicrin)		 76-06-2 0.1 ppm 0.3 ppm ---- ----
Nitrous oxide

     (Nitrogen oxide)		 10024-97-2 50 ppm 75 ppm ---- ----
Nonane 111-84-2 200 ppm 250 ppm ---- ----
Nuisance dusts (see Particulates not otherwise regulated) ---- ---- ---- ---- ----
Octachloronaphthalene 2234-13-1 0.1 mg/m3 0.3 mg/m3 ---- X
Octane 111-65-9 300 ppm 375 ppm ---- ----
Oil mist mineral (particulate) 8012-95-1 5 mg/m3 10 mg/m3 ---- ----
Osmium tetroxide (as Os) 20816-12-0 0.0002 ppm 0.0006 ppm ---- ----
Oxalic acid 144-62-7 1 mg/m3 2 mg/m3 ---- ----
Oxygen

     See requirements in other

     chapters such as:

     Chapter 296-809 WAC,

     Confined spaces; chapter

     296-843 WAC, Hazardous

     waste operations; chapter

     296-824 WAC, Emergency

     response; WAC 296-62-100,

     Oxygen deficient

     atmospheres		 ---- ---- ---- ---- ----
Oxygen difluoride 7783-41-7 ---- ---- 0.05 ppm ----
Ozone 10028-15-6 0.1 ppm 0.3 ppm ---- ----
Paper fiber

     (Cellulose)		 9004-34-6 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Paraffin wax fume 8002-74-2 2 mg/m3 4 mg/m3 ---- ----
Paraquat ---- ---- ---- ---- ----
     Respirable fraction 4685-14-7 0.1 mg/m3 0.3 mg/m3 ---- X
  1910-42-5        
  2074-50-2        
Parathion 56-38-2 0.1 mg/m3 0.3 mg/m3 ---- X
Particulate polycyclic

     aromatic hydrocarbons

     (see coal tar pitch volatiles)		       ---- ----
Particulates not otherwise

     regulated		 ---- ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Pentaborane 19624-22-7 0.005 ppm 0.015 ppm ---- ----
Pentachloronaphthalene 1321-64-8 0.5 mg/m3 1.5 mg/m3 ---- X
Pentachlorophenol 87-86-5 0.5 mg/m3 1.5 mg/m3 ---- X
Pentaerythritol 115-77-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Pentane 109-66-0 600 ppm 750 ppm ---- ----
2-Pentanone

     (methyl propyl ketone)		 107-87-9 200 ppm 250 ppm ---- ----
Perchloroethylene

     (tetrachloroethylene)		 127-18-4 25 ppm 38 ppm ---- ----
Perchloromethyl mercaptan 594-42-3 0.1 ppm 0.3 ppm ---- ----
Perchloryl fluoride 7616-94-6 3 ppm 6 ppm ---- ----
Perlite ---- ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Petroleum distillates

     (Naptha, rubber solvent)		 ---- 100 ppm 150 ppm ---- ----
Phenacyl chloride

     (a-Chloroacetophenone)		 532-21-4 0.05 ppm 0.15 ppm ---- ----
Phenol 108-95-2 5 ppm 10 ppm ---- X
Phenothiazine 92-84-2 5 mg/m3 10 mg/m3 ---- X
p-Phenylene diamine 106-50-3 0.1 mg/m3 0.3 mg/m3 ---- X
Phenyl ether (vapor) 101-84-8 1 ppm 3 ppm ---- ----
Phenyl ether-diphenyl

     mixture (vapor)		 ---- 1 ppm 3 ppm ---- ----
Phenylethylene (Styrene) 100-42-5 50 ppm 100 ppm ---- ----
Phenyl glycidyl ether (PGE) 122-60-1 1 ppm 3 ppm ---- ----
Phenylhydrazine 100-63-0 5 ppm 10 ppm ---- X
Phenyl mercaptan 108-98-5 0.5 ppm 1.5 ppm ---- ----
Phenylphosphine 638-21-1 ---- ---- 0.05 ppm ----
Phorate 298-02-2 0.05 mg/m3 0.2 mg/m3 ---- X
Phosdrin (Mevinphos) 7786-34-7 0.01 ppm 0.03 ppm ---- X
Phosgene (carbonyl chloride) 75-44-5 0.1 ppm 0.3 ppm ---- ----
Phosphine 7803-51-2 0.3 ppm 1 ppm ---- ----
Phosphoric acid 7664-38-2 1 mg/m3 3 mg/m3 ---- ----
Phosphorus (yellow) 7723-14-0 0.1 mg/m3 0.3 mg/m3 ---- ----
Phosphorous oxychloride 10025-87-3 0.1 ppm 0.3 ppm ---- ----
Phosphorus pentachloride 10026-13-8 0.1 ppm 0.3 ppm ---- ----
Phosphorus pentasulfide 1314-80-3 1 mg/m3 3 mg/m3 ---- ----
Phosphorus trichloride 12-2-19 0.2 ppm 0.5 ppm ---- ----
Phthalic anhydride 85-44-9 1 ppm 3 ppm ---- ----
m-Phthalodinitrile 626-17-5 5 mg/m3 10 mg/m3 ---- ----
Picloram 1918-02-1 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Picric acid (2, 4, 6-

     Trinitrophenol)		 88-89-1 0.1 mg/m3 0.3 mg/m3 ---- X
Pindone

     (2-Pivalyl-1, 3-indandione,

     Pival)		 83-26-1 0.1 mg/m3 0.3 mg/m3 ---- ----
Piperazine dihydrochloride 142-64-3 5 mg/m3 10 mg/m3 ---- ----
Pival (Pindone) 83-26-1 0.1 mg/m3 0.3 mg/m3 ---- ----
Plaster of Paris 26499-65-0 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Platinum (as Pt) 7440-06-4 ---- ---- ---- ----
     Metal ---- 1 mg/m3 3 mg/m3 ---- ----
     Soluble salts ---- 0.002 mg/m3 0.006 mg/m3 ---- ----
Polychlorobiphenyls

     (Chlorodiphenyls)		 ---- ---- ---- ---- ----
     42% Chlorine (PCB) 53469-21-9 1 mg/m3 3 mg/m3 ---- X
     54% Chlorine (PCB) 11097-69-1 0.5 mg/m3 1.5 mg/m3 ---- X
Portland cement 65997-15-1 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Potassium hydroxide 1310-58-3 ---- ---- 2 mg/m3 ----
Propane 74-98-6 1,000 ppm 1,250 ppm ---- ----
Propargyl alcohol 107-19-7 1 ppm 3 ppm ---- X
beta-Propiolactone

     (see WAC 296-62-073)		 57-57-8 ---- ---- ---- ----
Propionic acid 79-09-4 10 ppm 20 ppm ---- ----
Propoxur (Baygon) 114-26-1 0.5 mg/m3 1.5 mg/m3 ---- ----
n-Propyl acetate 109-60-4 200 ppm 250 ppm ---- ----
n-Propyl alcohol 71-23-8 200 ppm 250 ppm ---- X
n-Propyl nitrate 627-13-4 25 ppm 40 ppm ---- ----
Propylene ---- Simple asphyxiant ---- ---- ----
Propylene dichloride

     (1, 2-Dichloropropane)		 78-87-5 75 ppm 110 ppm ---- ----
Propylene glycol dinitrate 6423-43-4 0.05 ppm 0.15 ppm ---- X
Propylene glycol

     monomethyl ether		 107-98-2 100 ppm 150 ppm ---- ----
Propylene imine 75-55-8 2 ppm 4 ppm ---- X
Propylene oxide (1,2-

     Epoxypropane)		 75-56-9 20 ppm 30 ppm ---- ----
Propyne (Methyl acetylene) 74-99-7 1,000 ppm 1,250 ppm ---- ----
Pyrethrum 8003-34-7 5 mg/m3 10 mg/m3 ---- ----
Pyridine 110-86-1 5 ppm 10 ppm ---- ----
Pyrocatachol

     (Catechol)		 120-80-9 5 ppm 10 ppm ---- X
Quinone (p-Benzoquinone) 106-51-4 0.1 ppm 0.3 ppm ---- ----
RDX (Cyclonite) ---- 1.5 mg/m3 3 mg/m3 ---- X
Resorcinol 108-46-3 10 ppm 20 ppm ---- ----
Rhodium (as Rh) 7440-16-6 ---- ---- ---- ----
     Insoluble compounds,

     metal fumes and dusts		 ---- 0.1 mg/m3 0.3 mg/m3 ---- ----
     Soluble compounds, salts ---- 0.001 mg/m3 0.003 mg/m3 ---- ----
Ronnel 299-84-3 10 mg/m3 20 mg/m3 ---- ----
Rosin core solder, pyrolysis

     products (as formaldehyde)		 8050-09-7 0.1 mg/m3 0.3 mg/m3 ---- ----
Rotenone 83-79-4 5 mg/m3 10 mg/m3 ---- ----
Rouge ---- ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Rubber solvent (naphtha) 8030-30-6 100 ppm 150 ppm ---- ----
Selenium compounds (as Se) 7782-49-2 0.2 mg/m3 0.6 mg/m3 ---- ----
Selenium hexafluoride (as Se) 7783-79-1 0.05 ppm 0.15 ppm ---- ----
Sesone (Crag herbicide) 136-78-7 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Sevin

     (Carbaryl)		 63-25-2 5 mg/m3 10 mg/m3 ---- ----
Silane (see Silicon tetrahydride) 7803-62-5 5 ppm 10 ppm ---- ----
Silica, amorphous, precipitated

     and gel		 112926-00-8 6 mg/m3 12 mg/m3 ---- ----
Silica, amorphous, diatomaceous

     earth, containing less than

     1% crystalline silica		 61790-53-2 ---- ---- ---- ----
     Total particulate ---- 6 mg/m3 12 mg/m3 ---- ----
     Respirable fraction ---- 3 mg/m3 6 mg/m3 ---- ----
Silica, crystalline cristobalite ---- ---- ---- ---- ----
     Respirable fraction 14464-46-1 0.05 mg/m3 0.15 mg/m3 ---- ----
Silica, crystalline quartz ---- ---- ---- ---- ----
     Respirable fraction 14808-60-7 0.1 mg/m3 0.3 mg/m3 ---- ----
Silica, crystalline tripoli

     (as quartz)		 ---- ---- ---- ---- ----
     Respirable fraction 1317-95-9 0.1 mg/m3 0.3 mg/m3 ---- ----
Silica, crystalline tridymite ---- ---- ---- ---- ----
     Respirable fraction 15468-32-3 0.05 mg/m3 0.15 mg/m3 ---- ----
Silica, fused ---- ---- ---- ---- ----
     Respirable fraction 60676-86-0 0.1 mg/m3 0.3 mg/m3 ---- ----
Silicates (less than 1% crystalline silica) ---- ---- ---- ---- ----
     Mica ---- ---- ---- ---- ----
          Respirable fraction 12001-26-2 3 mg/m3 6 mg/m3 ---- ----
     Soapstone ---- ---- ---- ---- ----
          Total particulate ---- 6 mg/m3 12 mg/m3 ---- ----
          Respirable fraction ---- 3 mg/m3 6 mg/m3 ---- ----
     Talc (containing asbestos)

          (as asbestos)

          (see WAC

          296-62-07705 and

          chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
     Talc (containing no

          asbestos)		 ---- ---- ---- ---- ----
          Respirable fraction 14807-96-6 2 mg/m3 4 mg/m3 ---- ----
     Tremolite

          (asbestiform)

          (as asbestos)

          (see WAC

          296-62-07705

          and chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Silicon 7440-21-3 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Silicon carbide 409-21-2 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Silicon tetrahydride (Silane) 7803-62-5 5 ppm 10 ppm ---- ----
Silver, metal dust and soluble

     compounds (as Ag)		 7440-22-4 0.01 mg/m3 0.03 mg/m3 ---- ----
Soapstone ---- ---- ---- ---- ----
     Total particulate ---- 6 mg/m3 12 mg/m3 ---- ----
     Respirable fraction ---- 3 mg/m3 6 mg/m3 ---- ----
Sodium azide (as HN3 or NaN3) 26628-22-8 ---- ---- 0.1 ppm X
Sodium bisulfite 7631-90-5 5 mg/m3 10 mg/m3 ---- ----
Sodium-2,

     4-dichloro-

     phenoxyethyl

     sulfate

     (Crag herbicide)		 136-78-7 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Sodium fluoroacetate 62-74-8 0.05 mg/m3 0.15 mg/m3 ---- X
Sodium hydroxide 1310-73-2 ---- ---- 2 mg/m3 ----
Sodium metabisulfite 7681-57-4 5 mg/m3 10 mg/m3 ---- ----
Starch 9005-25-8 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Stibine 7803-52-3 0.1 ppm 0.3 ppm ---- ----
Stoddard solvent 8052-41-3 100 ppm 150 ppm ---- ----
Strychnine 57-24-9 0.15 mg/m3 0.45 mg/m3 ---- ----
Styrene (Phenylethylene,

     Vinyl benzene)		 100-42-5 50 ppm 100 ppm ---- ----
Subtilisins 9014-01-1 ---- 0.00006 mg/m3 ---- ----
      (60 min.)    
Sucrose 57-50-1 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Sulfotep (TEDP) 3689-24-5 0.2 mg/m3 0.6 mg/m3 ---- X
Sulfur dioxide 7446-09-5 2 ppm 5 ppm ---- ----
Sulfur hexafluoride 2551-62-4 1,000 ppm 1,250 ppm ---- ----
Sulfuric acid 7664-93-9 1 mg/m3 3 mg/m3 ---- ----
Sulfur monochloride 10025-67-9 ---- ---- 1 ppm ----
Sulfur pentafluoride 5714-22-1 ---- ---- 0.01 ppm ----
Sulfur tetrafluoride 7783-60-0 ---- ---- 0.1 ppm ----
Sulfuryl fluoride 2699-79-8 5 ppm 10 ppm ---- ----
Sulprofos 35400-43-2 1 mg/m3 3 mg/m3 ---- ----
Systox (Demeton) 8065-48-3 0.01 ppm 0.03 ppm ---- X
2, 4, 5-T (2, 4, 5- tri-

     chlorophenoxyacetic acid)		 93-76-5 10 mg/m3 20 mg/m3 ---- ----
Talc (containing asbestos)

     (as asbestos)

     (see WAC 296-62-07705

     and chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Talc (containing no asbestos) ---- ---- ---- ---- ----
     Respirable fraction 14807-96-6 2 mg/m3 4 mg/m3 ---- ----
Tantalum ---- ---- ---- ---- ----
     Metal and oxide dusts 7440-25-7 5 mg/m3 10 mg/m3 ---- ----
TDI

     (Toluene-2, 4-diisocyanate)		 584-84-9 0.005 ppm 0.02 ppm ---- ----
TEDP (Sulfotep) 3689-24-5 0.2 mg/m3 0.6 mg/m3 ---- X
Tellurium and compounds (as Te) 13494-80-9 0.1 mg/m3 0.3 mg/m3 ---- ----
Tellurium hexafluoride (as Te) 7783-80-4 0.02 ppm 0.06 ppm ---- ----
Temephos (Abate) 3383-96-8 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
TEPP 107-49-3 0.004 ppm 0.012 ppm ---- X
Terphenyls 26140-60-3 ---- ---- 0.5 ppm ----
1, 1, 1, 2-Tetrachloro-2,

     2-difluoroethane		 76-11-0 500 ppm 625 ppm ---- ----
1, 1, 2, 2-Tetrachloro-1,

     2-difluoroethane		 76-12-0 500 ppm 625 ppm ---- ----
1, 1, 2, 2-Tetrachloroethane 79-34-5 1 ppm 3 ppm ---- X
Tetrachloroethylene

     (Perchloroethylene)		 127-18-4 25 ppm 38 ppm ---- ----
Tetrachloromethane

     (Carbon tetrachloride)		 56-23-5 2 ppm 4 ppm ---- X
Tetrachloronaphthalene 1335-88-2 2 mg/m3 4 mg/m3 ---- X
Tetraethyl lead (as Pb) 78-00-2 0.075 mg/m3 0.225 mg/m3 ---- X
Tetrahydrofuran 109-99-9 200 ppm 250 ppm ---- ----
Tetramethyl lead (as Pb) 75-74-1 0.075 mg/m3 0.225 mg/m3 ---- X
Tetramethyl succinonitrile 3333-52-6 0.5 ppm 1.5 ppm ---- X
Tetranitromethane 509-14-8 1 ppm 3 ppm ---- ----
Tetrasodium pyrophosphate 7722-88-5 5 mg/m3 10 mg/m3 ---- ----
Tetryl (2, 4, 6-trinitrophenyl-

     methylnitramine)		 479-45-8 1.5 mg/m3 3 mg/m3 ---- X
Thallium (soluble compounds)

     (as Tl)		 7440-28-0 0.1 mg/m3 0.3 mg/m3 ---- X
4, 4-Thiobis

     (6-tert-butyl-m-cresol)		 96-69-5 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Thiodan

     (Endosulfan)		 115-29-7 0.1 mg/m3 0.3 mg/m3 ---- X
Thioglycolic acid 68-11-1 1 ppm 3 ppm ----- X
Thionyl chloride 7719-09-7 ---- ---- 1 ppm ----
Thiram

     (see WAC 296-62-07519)		 137-26-8 5 mg/m3 10 mg/m3 ---- ----
Tin (as Sn) ---- ---- ---- ---- ----
     Inorganic compounds 7440-31-5 2 mg/m3 4 mg/m3 ---- ----
Tin (as Sn) ---- ---- ---- ---- ----
     Organic compounds 7440-31-5 0.1 mg/m3 0.3 mg/m3 ---- X
Tin oxide (as Sn) 21651-19-4 2 mg/m3 4 mg/m3 ---- ----
Titanium dioxide 13463-67-7 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
TNT

     (2, 4, 6-Trinitrotoluene)		 118-96-7 0.5 mg/m3 1.5 mg/m3 ---- X
Toluene 108-88-3 100 ppm 150 ppm ---- ----
Toluene-2, 4-diisocyanate (TDI) 584-84-9 0.005 ppm 0.02 ppm ----- ----
m-Toluidine 108-44-1 2 ppm 4 ppm ---- X
o-Toluidine 95-53-4 2 ppm 4 ppm ---- X
p-Toluidine 106-49-0 2.0 ppm 4 ppm ---- X
Toxaphene

     (Chlorinated camphene)		 8001-35-2 0.5 mg/m3 1 mg/m3 ---- X
Tremolite (asbestiform)

     (as asbestos)

     (see WAC

     296-62-07705 and

     chapter 296-65 WAC)		 ---- 0.1 f/cc 1.0 f/cc (30 minutes) ---- ----
Tributyl phosphate 126-73-8 0.2 ppm 0.6 ppm ---- ----
Trichloroacetic acid 76-03-9 1 ppm 3 ppm ---- ----
1, 2, 4-Trichlorobenzene 120-82-1 ---- ---- 5 ppm ----
1, 1, 1-Trichloroethane

     (Methyl chloroform)		 71-55-6 350 ppm 450 ppm ---- ----
1, 1, 2-Trichloroethane 79-00-5 10 ppm 20 ppm ---- ----
Trichloroethylene 79-01-6 50 ppm 200 ppm ---- ----
Trichlorofluoromethane

     (Fluorotrichloromethane)		 75-69-4 ---- ---- 1,000 ppm ----
Trichloromethane

     (Chloroform)		 67-66-3 2 ppm 4 ppm ---- ----
Trichloronaphthalene 1321-65-9 5 mg/m3 10 mg/m3 ---- X
1, 2, 3-Trichloropropane 96-18-4 10 ppm 20 ppm ---- X
1, 1, 2-Trichloro-1, 2,

     2-trifluoroethane		 76-13-1 1,000 ppm 1,250 ppm ---- ----
Tricyclohexyltin hydroxide

     (Cyhexatin)		 13121-70-5 5 mg/m3 10 mg/m3 ---- ----
Triethylamine 121-44-8 10 ppm 15 ppm ---- ----
Trifluorobromomethane 75-63-8 1,000 ppm 1,250 ppm ---- ----
Trimellitic anhydride 552-30-7 0.005 ppm 0.015 ppm ---- ----
Trimethylamine 75-50-3 10 ppm 15 ppm ---- ----
Trimethyl benzene 25551-13-7 25 ppm 38 ppm ---- ----
Trimethyl phosphite 121-45-9 2 ppm 4 ppm ---- ----
2, 4, 6-Trinitrophenol

     (Picric acid)		 88-89-1 0.1 mg/m3 0.3 mg/m3 ---- X
2, 4, 6-Trinitrophenyl-

     methylnitramine

     (Tetryl)		 479-45-8 1.5 mg/m3 3 mg/m3 ----- X
2, 4, 6-Trinitrotoluene (TNT) 118-96-7 0.5 mg/m3 1.5 mg/m3 ---- X
Triorthocresyl phosphate 78-30-8 0.1 mg/m3 0.3 mg/m3 ---- X
Triphenyl amine 603-34-9 5 mg/m3 10 mg/m3 ---- ----
Triphenyl phosphate 115-86-6 3 mg/m3 6 mg/m3 ---- ----
Tungsten (as W) 7440-33-7 ---- ---- ---- ----
     Soluble compounds ---- 1 mg/m3 3 mg/m3 ---- ----
     Insoluble compounds ---- 5 mg/m3 10 mg/m3 ---- ----
Turpentine 8006-64-2 100 ppm 150 ppm ---- ----
Uranium (as U) 7440-61-1 ---- ---- ---- ----
     Soluble compounds ---- 0.05 mg/m3 0.15 mg/m3 ---- ----
     Insoluble compounds ---- 0.2 mg/m3 0.6 mg/m3 ---- ----
n-Valeraldehyde 110-62-3 50 ppm 75 ppm ---- ----
Vanadium (as V2O5) ---- ---- ---- ---- ----
     Respirable fraction 1314-62-1 0.05 mg/m3 0.15 mg/m3 ---- ----
Vegetable oil mist ---- ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Vinyl acetate 108-05-1 10 ppm 20 ppm ---- ----
Vinyl benzene (Styrene) 100-42-5 50 ppm 100 ppm ---- ----
Vinyl bromide 593-60-2 5 ppm 10 ppm ---- ----
Vinyl chloride (Chloroethylene)

     (see WAC 296-62-07329)		 75-01-4 1 ppm 5 ppm ---- ----
Vinyl cyanide (Acrylonitrile)

     (see WAC 296-62-07336)		 107-13-1 2 ppm 10 ppm ---- ----
Vinyl cyclohexene dioxide 106-87-6 10 ppm 20 ppm ---- X
Vinyl toluene 25013-15-4 50 ppm 75 ppm ---- ----
Vinylidene chloride

     (1, 1-Dichloroethylene)		 75-35-4 1 ppm 3 ppm ---- ----
VM & P Naphtha 8032-32-4 300 ppm 400 ppm ---- ----
Warfarin 81-81-2 0.1 mg/m3 0.3 mg/m3 ---- ----
Welding fumes

     (total particulate)		 ---- 5 mg/m3 10 mg/m3 ---- ----
Wood dust ---- ---- ---- ---- ----
     Nonallergenic;

          (All woods except

          allergenics)		 ---- 5 mg/m3 10 mg/m3 ---- ----
     Allergenics (e.g. cedar,

          mahogany and teak)		 ---- 2.5 mg/m3 5 mg/m3 ---- ----
Xylenes (ortho, meta, and

     para isomers)

     (Dimethylbenzene)		 1330-20-7 100 ppm 150 ppm ---- ----
m-Xylene alpha, alpha-diamine 1477-55-0 ---- ---- 0.1 mg/m3 X
Xylidine

     (Dimethylaminobenzene)		 1300-73-8 2 ppm 4 ppm ---- X
Yttrium 7440-65-5 1 mg/m3 3 mg/m3 ---- ----
Zinc chloride fume 7646-85-7 1 mg/m3 2 mg/m3 ---- ----
Zinc chromate (as Cr)

     (see WAC 296-62-08003)		 Varies with compound 0.005 mg/m3 ---- 0.1 mg/m3 ----
Zinc oxide 1314-13-2 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m ---- ----
Zinc oxide fume 1314-13-2 5 mg/g3 10 mg/m3 ---- ----
Zinc stearate 557-05-1 ---- ---- ---- ----
     Total particulate ---- 10 mg/m3 20 mg/m3 ---- ----
     Respirable fraction ---- 5 mg/m3 10 mg/m3 ---- ----
Zirconium compounds (as Zr) 7440-67-2 5 mg/m3 10 mg/m3 ---- ----




[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-20025, filed 2/20/07, effective 4/1/07; 04-18-079, § 296-841-20025, filed 8/31/04, effective 11/1/04.]

296-841-300
Definitions.

  

     Breathing zone

     The space around and in front of an employee's nose and mouth, forming a hemisphere with a six to nine inch radius.

     Ceiling limit

     See Permissible exposure limits (PELs).

     Dust

     Solid particles suspended in air. Dusts are generated by handling, drilling, crushing, grinding, rapid impact, detonation, or decrepitation of organic or inorganic materials such as rock, ore, metal, coal, wood, grain, etc.

     Exposed or exposure

     The contact an employee has with a toxic substance, harmful physical agent or oxygen deficient condition, whether or not protection is provided by respirators or other personal protective equipment (PPE). Exposure can occur through various routes of entry, such as inhalation, ingestion, skin contact, or skin absorption.

     Fume

     Solid particles suspended in air, generated by condensation from the gaseous state, generally after volatilization from molten metals, etc.

     Gas

     A normally formless fluid which can be changed to the liquid or solid state by the effect of increased pressure or decreased temperature or both.

     General exhaust ventilation

     The general movement of air out of an area or permit-required confined space by mechanical or natural means.

     Immediately dangerous to life or health (IDLH)

     An atmospheric condition that would:

     • Cause an immediate threat to life

     or

     • Cause permanent or delayed adverse health effects

     or

     • Interfere with an employee's ability to escape

     Mist

     Liquid droplets suspended in air, generated by condensation from the gaseous to the liquid state or by breaking up a liquid into a dispersed state, such as by splashing, foaming, spraying or atomizing.

     Nuisance dust (or inert dust)

     Dusts that, when inhaled, have little adverse effect on the lungs and do not produce significant organic disease or toxic effect when exposures are kept under reasonable control.

     The biological reaction to these dusts in lung tissue has the following characteristics:

     • The architecture of the air spaces remains intact

     • Scar tissue (collagen) isn't formed to a significant extent

     • The tissue reaction is potentially reversible

     Oxygen deficient

     An atmosphere with an oxygen content below 19.5% by volume.

     Permissible exposure limits (PEL)

     The amount of an airborne chemical, toxic substance, or other harmful agent that must not be exceeded during any part of the workday.

     An airborne chemical or toxic substance can have 3 PEL values:

     • TWA8. This is an 8-hour, time-weighted average limit.

     • Short-term exposure limit (STEL). This is typically a 15-minute, time-weighted average limit.

     • Ceiling limit (C). This is an instantaneous limit.

     Short-term exposure limit (STEL)

     See Permissible exposure limits (PELs).

     Temper

     To condition air for a specific work environment by changing its temperature or moisture content.

     Time weighted average (TWA8)

     See Permissible exposure limits (PELs).

     Toxic substance

     Any chemical substance or biological agent, such as bacteria, virus, and fungus, which is any of the following:

     • Listed in the latest edition of the National Institute for Occupational Safety and Health (NIOSH) Registry of Toxic Effects of Chemical Substances (RTECS)

     • Shows positive evidence of an acute or chronic health hazard in testing conducted by, or known to, the employer.

     • The subject of a material safety data sheet kept by or known to the employer showing the material may pose a hazard to human health.

     Vapor

     The gaseous form of a substance that is normally in the solid or liquid state.

     Ventilation

     Providing, circulating or exhausting air into or out of an area or space.



[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-05-062, § 296-841-300, filed 2/20/07, effective 4/1/07; 04-18-079, § 296-841-300, filed 8/31/04, effective 11/1/04; 03-20-115, § 296-841-300, filed 10/1/03, effective 1/1/04.]