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Chapter 296-841 WAC

Last Update: 3/18/14

AIRBORNE CONTAMINANTS

WAC Sections

Scope.
Evaluate and control employee exposures.
Employee protective measures.
Exposure evaluations.
Exposure controls.
Respirators.
Notification.
Permissible exposure limits (PELs).
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 safety data sheet (SDS) 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 and 29 C.F.R. 1910 Subpart Z. WSR 14-07-086, § 296-841-100, filed 3/18/14, effective 5/1/14. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 07-05-062, § 296-841-100, filed 2/20/07, effective 4/1/07; WSR 06-08-087, § 296-841-100, filed 4/4/06, effective 9/1/06; WSR 05-17-168, § 296-841-100, filed 8/23/05, effective 1/1/06; WSR 04-18-079, § 296-841-100, filed 8/31/04, effective 11/1/04; WSR 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. WSR 07-05-062, § 296-841-200, filed 2/20/07, effective 4/1/07; WSR 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, safety data sheets (SDSs), manufacturer recommendations, and industry protocols.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060 and 29 C.F.R. 1910 Subpart Z. WSR 14-07-086, § 296-841-20003, filed 3/18/14, effective 5/1/14. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 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 safety data sheets (SDSs), 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 and 29 C.F.R. 1910 Subpart Z. WSR 14-07-086, § 296-841-20005, filed 3/18/14, effective 5/1/14. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 07-05-062, § 296-841-20005, filed 2/20/07, effective 4/1/07; WSR 04-18-079, § 296-841-20005, filed 8/31/04, effective 11/1/04; WSR 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. WSR 07-05-062, § 296-841-20010, filed 2/20/07, effective 4/1/07; WSR 04-18-079, § 296-841-20010, filed 8/31/04, effective 11/1/04; WSR 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. WSR 07-05-062, § 296-841-20015, filed 2/20/07, effective 4/1/07; WSR 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. WSR 07-05-062, § 296-841-20020, filed 2/20/07, effective 4/1/07; WSR 04-18-079, § 296-841-20020, filed 8/31/04, effective 11/1/04; WSR 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.
• 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
1306-19-0
0.005 mg/m3
——
——
——
Cadmium dust and salts (as Cd)
(see WAC 296-62-074
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
Varies with
compound
——
——
0.1 mg/m3
——
Chromium
——
——
——
——
——
Chromium (VI) compounds
(as Cr) (when the compound
is covered by
——
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
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
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,
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
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
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
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
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)