PERMANENT RULES
LABOR AND INDUSTRIES
Effective Date of Rule: April 1, 2007.
Purpose: The Occupational Safety and Health Administration (OSHA) recently adopted rules regulating hexavalent chromium. We made changes to our permissible exposure limit table to remain as-effective-as OSHA. In addition, general ventilation requirements in chapter 296-62 WAC, the general occupational health standards were repealed from that chapter and moved into chapter 296-841 WAC, the general exposure control sections. We also changed the title of the rule, reformatted it, and clarified some language.
Amended sections:
Chapter 296-841 WAC, Respiratory hazards:
| | Changes were being made throughout this rule to bring it into compliance with OSHA, to change the title to airborne hazards, and to further clarify language. |
| | General ventilation requirements were moved from chapter 296-62 WAC into this chapter. |
Repealed sections:
Chapter 296-62 WAC, General occupational health standards.
| | General ventilation requirements were repealed from this chapter and moved into chapter 296-841 WAC. |
Citation of Existing Rules Affected by this Order: Amending WAC 296-841-100 Scope, 296-841-200 Evaluate and control employee exposures, 296-841-20005 Exposure evaluations, 296-841-20010 Exposure controls, 296-841-20015 Respirators, 296-841-20020 Notification, 296-841-20025 Permissible exposure limits, 296-841-300 Definitions, 296-78-71015 Tanks and chemicals, 296-155-20301 Definitions, 296-304-01009 Precautions for hot work, 296-806-47502 Guard drum sanders, 296-809-800 Definitions, 296-824-800 Definitions, 296-828-100 Scope, 296-828-20005 Chemical hygiene plan, 296-839-30005 Develop or obtain material safety data sheets (MSDSs), 296-849-11030 Exposure evaluations, 296-849-13005 Exposure control plan and 296-849-13020 Exposure controls; and repealing WAC 296-62-100 Oxygen deficient atmospheres, 296-62-110 Ventilation, 296-62-11001 Definition, 296-62-11003 Ventilation guide, 296-62-11005 Adequate system, 296-62-11007 Exhaust, 296-62-11009 Make-up air quantity, 296-62-11011 Design and operation, 296-62-11013 Compatibility of systems, and 296-62-11017 Grinding, polishing, and buffing operations.
Statutory Authority for Adoption: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060.
Adopted under notice filed as WSR 07-01-079 on December 19, 2007 [2006].
Number of Sections Adopted in Order to Comply with Federal Statute: New 0, Amended 0, Repealed 0; Federal Rules or Standards: New 0, Amended 1, Repealed 0; or Recently Enacted State Statutes: New 0, Amended 0, Repealed 0.
Number of Sections Adopted at Request of a Nongovernmental Entity: New 0, Amended 0, Repealed 0.
Number of Sections Adopted on the Agency's Own Initiative: New 0, Amended 0, Repealed 0.
Number of Sections Adopted in Order to Clarify, Streamline, or Reform Agency Procedures: New 0, Amended 20, Repealed 10.
Number of Sections Adopted Using Negotiated Rule Making: New 0, Amended 21, Repealed 0; Pilot Rule Making: New 0, Amended 0, Repealed 0; or Other Alternative Rule Making: New 0, Amended 0, Repealed 0.
Date Adopted: February 20, 2007.
Judy Schurke
Acting Director
OTS-8864.3
((RESPIRATORY HAZARDS)) AIRBORNE CONTAMINANTS
Are exposed to a respiratory hazard
OR
Could be exposed to one of the specific hazards listed below.
This chapter applies to any workplace with potential or actual employee exposure to respiratory hazards. It requires you to protect employees from respiratory hazards by applying this protection strategy:
Evaluate employee exposures to determine if controls are needed
Use feasible controls. For example, enclose or confine the operation, use ventilation systems, or substitute with less toxic material
Use respirators if controls are not feasible or if they cannot completely remove the hazard.
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.
| (( |
||
chloropropane |
||
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:
&sqbul; Listed in the latest edition of the NIOSH Registry of Toxic Effects of Chemical Substances
&sqbul; For which positive evidence of an acute or chronic health hazard exists through tests conducted by, or known to, the employer
&sqbul; 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
&sqbul; 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. 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.]
((Summary
Your responsibility:
To protect your employees from exposure to respiratory hazards in the workplace by identifying and controlling the hazards.
You must:
Identify and evaluate employee exposures
Control employee exposures
Use respirators
Notify employees
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. 03-20-115, § 296-841-200, filed 10/1/03, effective 1/1/04.]
| Note: | Resources include product labels, material safety data sheets (MSDSs), manufacturer recommendations, and industry protocols. |
[]
((You must:
Make sure employees are protected from potentially hazardous exposure while you perform your evaluation
Perform your evaluation without considering the protection provided to employees by a respirator
Determine the form of the hazard, such as dust, mist, gas, oxygen deficiency, or biological agent.
Make sure you consider:
Potential emergency and rescue situations that may occur, such as equipment or power failures, uncontrolled chemical reactions, fire, explosion, or human error
Workplace conditions such as work processes, types of material, control methods, work practices and environmental conditions.
Determine or reasonably estimate whether any employee is or could be exposed to any of the following:
Any airborne substance above a permissible exposure limit (PEL) listed in Table 3
A substance at or above the action level (AL) specified in the rule for that substance
Any other respiratory hazard.
Use any of the following to determine employee exposure:
Information that would allow an estimate of the level of employee exposure, such as MSDSs or pesticide labels, observations, measurements or calculations
Data demonstrating that a particular product, material or activity cannot result in employee exposure at or above the AL or PEL
Personal air samples that represent an employee's usual
or worst case exposure for the entire shift.
Consider the atmosphere to be immediately dangerous to life or health (IDLH) when you cannot determine or reasonably estimate employee exposure
Make sure employee exposure, to two or more substances with additive health effects, is evaluated using this formula:
| (( |
L1 |
L2 |
Ln)) |
| (( |
|
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. |
(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.
&sqbul; 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. |
| 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. 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.]
((You must:
Use feasible controls to protect employees from exposure to respiratory hazards by:
Reducing employee exposure to a level that removes the respiratory hazard, such as to a level below the permissible exposure limits (PEL) in Table 3;
OR
Reducing the exposure to the lowest achievable level, when the respiratory hazard cannot be removed.
IMPORTANT:
Using respirators and other PPE is not a substitute for the feasible controls required by this section.
Note: The following table gives you examples of control methods.)) 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:
&sqbul; Reentering the building in harmful amounts
or
&sqbul; 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
| (( |
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
(( |
|
| Changing a process to
(( |
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 | |
| (( |
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 | |
| (( |
|
| (( |
Change the position of
the (( |
| 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 |
| (( Some specific rules prohibit the use of this control method |
|
| 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. 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.]
((You must:
)) Require employees to use ((respiratory protection))
respirators when ((respiratory)) 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 ((respiratory)) airborne hazard is not
completely removed
When exposure controls are NOT feasible.
((Reference:
See chapter 296-842 WAC, Respirators, for respirator program requirements.))
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. 03-20-115, § 296-841-20015, filed 10/1/03, effective 1/1/04.]
((You must:
)) Notify employees who are or may be exposed to
((respiratory)) 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. 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.]
IMPORTANT:
The following information applies to Table 3, Permissible
Exposure Limits (PELs) for ((Air)) Airborne Contaminants.
(( Exposure needs to be determined from personal air
samples taken in the breathing zone OR from monitoring
representative of the employee's breathing zone.))
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 ((substance)) 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.
(( Time weighted averages (TWA8) represent the maximum
allowed average exposure for any 8-hour time period. For work
periods longer than 8-hours the TWA8 needs to be determined
using the 8 continuous hours with the highest average
concentration.))
Short-term exposure limits (STEL) ((represent maximum
allowed average exposure for any)) pertain to fifteen-minute
exposure periods, unless another time period is noted in Table
3.
(( The ceiling represents the maximum allowed exposure
for the shortest time period that can feasibly be measured.))
An "X" in the "skin" column indicates the ((substance))
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 |
| (( |
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 |
---- | 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 |
---- | 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 (( 296-62-07347)) chapter 296-848 WAC) |
7440-38-2 | 0.01 mg/m3 | ---- | ---- | ---- |
| Arsenic, inorganic compounds (as As) (when use is not covered by (( 296-62-07347)) 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) |
---- | (( |
(( |
---- | ---- |
| 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 (( 296-62-07523)) 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 | ---- |