Wash. Admin. Code § 296-307-62625 - Permissible exposure limits of air contaminants
IMPORTANT:
The following information applies to Table 3, Permissible Exposure Limits for Air Contaminants.
1. Exposure needs to be determined from
personal air samples taken in the breathing zone or from monitoring
representative of the employee's breathing zone.
2. Ppm refers to parts of vapor or gas per
million parts of air by volume, at 25 degrees C and 760 mm Hg
pressure.
3.
Mg/m3 refers to milligrams of substance per cubic
meter of air.
4. 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 website:
https://www.cas.org.
5. 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.
6. Short-term exposure limits (STEL)
represent maximum allowed average exposure for any fifteen-minute period,
unless another time period is noted in Table 3.
7. The ceiling represents the maximum allowed
exposure for the shortest time period that can feasibly be measured.
8. An "X" in the "skin" column indicates the
substance can be absorbed through the skin, either by airborne or direct
contact.
9. Requirements for the
use of gloves, coveralls, goggles, and other personal protective equipment can
be found in WAC
296-307-100.
10. The respirable fraction of particulate 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 for Air Contaminants"
| Substance | 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 | - |
| Acetone | 67-64-1 | 750 ppm | 1,000 ppm | - | - |
| Acetonitrile | 75-05-8 | 40 ppm | 60 ppm | - | - |
| 2-Acetylaminofluorene | 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) | 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 | 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 | - | - |
| 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 |
| 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 WAC 296-62-07347) | 7440-38-2 | 0.01 mg/m3 | - | - | - |
| Arsenic, inorganic compounds (as As) (when use is not covered by WAC 296-62-07347) | 7440-38-2 | 0.2 mg/m3 | 0.6 mg/m3 | - | - |
| Arsine | 7784-42-1 | 0.05 ppm | 0.15 ppm | - | - |
| Asbestos | - | - | - | - | - |
| 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 | 71-43-2 | 1 ppm | 5 ppm | - | - |
| Benzidine | 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) (see chapter 296-850 WAC) | 7440-41-7 | 0.0002 mg/m3 | 0.002 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 (Chlorobromomethane) | 74-97-5 | 200 ppm | 250 ppm | - | - |
| Bromoform | 15-25-2 | 0.5 ppm | 1. 5 ppm | - | X |
| Butadiene (1,3-butadiene) | 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 CrOs) | 1189-85-1 | - | - | 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) | 1306-19-0 | 0.005 mg/m3 | - | - | - |
| Cadmium dust and salts (as Cd) | 7440-43-9 | 0.005 mg/m3 | - | - | - |
| Calcium arsenate | - | 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) | 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 | 542-88-1 | - | - | - | - |
| Chloromethyl methyl ether (Methyl chloromethyl ether) | 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 | - | - |
| 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 CrO3) | Varies with compound | 0.1 mg/m3 | 0.3 mg/m3 | - | - |
| Chromium, soluble, chromic and chromous salts (as Cr) | 7440-47-3 | 0.5 mg/m3 | 1. 5 mg/m3 | - | - |
| Chromium (VI) compounds (as Cr) | - | 0.05 mg/m3 | 0.15 mg/m3 | - | - |
| Chromium metal and insoluble salts | 7440-47-3 | 0.5 mg/m3 | 1. 5 mg/m3 | - | - |
| Chromyl chloride | 14977-61-8 | 0.025 ppm | 0.075 ppm | - | - |
| Chrysene (Coal tar pitch volatiles) | 65996-93-2 | 0.2 mg/m3 | 0.6 mg/m3 | - | - |
| 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) (Particulate polycyclic aromatic hydrocarbons) | 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 | - | 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) | - | 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 |
| 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) | 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) | 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 | 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) | 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 | 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-ethylhexylphthal-ate) | 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 | 151-56-4 | - | - | - | X |
| Ethylene oxide | 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 | 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 | - | - |
| Gluteraldehyde | 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) | 7439-92-1 | 0.05 mg/m3 | - | - | - |
| Lead arsenate (as Pb) | 3687-31-8 | 0.05 mg/m3 | - | - | - |
| Lead chromate (as Pb) | 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)) | 101-14-4 | - | - | - | X |
| MDA(4, 4-Methylene dianiline) | 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) | 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) | 101-14-4 | - | - | - | X |
| Methylene bis (4-cyclohexylisocyanate) | 5124-30-1 | - | - | 0.01 ppm | - |
| Methylene chloride (Dichloromethane) | 75-09-2 | 25 ppm | 125 ppm | - | - |
| 4, 4-Methylene dianiline (MDA) | 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 | 134-32-7 | - | - | - | - |
| beta-Naphthylamine | 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 | 92-93-3 | - | - | - | - |
| p-Nitrochlorobenzene | 100-00-5 | 0.5 mg/m3 | 1. 5 mg/m3 | - | X |
| 4-Nitrodiphenyl | - | - | - | - | - |
| 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 | 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 | - | - |
| 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 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 1910-42-5 2074-50-2 | 0.1 mg/m3 | 0.3 mg/m3 | - | X |
| Parathion | 56-38-2 | 0.1 mg/m3 | 0.3 mg/m3 | - | X |
| Particulate polycyclic aromatic hydrocarbons (benzene soluble fraction) (coal tar pitch volatiles) | 65996-93-2 | 0.2 mg/m3 | 0.6 mg/m3 | - | - |
| 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 | 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 fractionApplies where the exposure limit in chapter 296-840 WAC is not in effect. | 14464-46-1 | 0.05 mg/m3 | 0.15 mg/m3 | - | - |
| Silica, crystalline quartz | - | - | - | - | - |
| Respirable fractionApplies where the exposure limit in chapter 296-840 WAC is not in effect. | 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 fractionApplies where the exposure limit in chapter 296-840 WAC is not in effect. | 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) | - | - | - | - | - |
| Talc (containing no asbestos) | - | - | - | - | - |
| Respirable fraction | 14807-96-6 | 2 mg/m3 | 4 mg/m3 | - | - |
| Tremolite | - | - | - | - | - |
| 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 | 93-76-5 | 10 mg/m3 | 20 mg/m3 | - | - |
| Talc (containing asbestos) | - | - | - | - | - |
| 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 | 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 | - | - | - | - | - |
| 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) | 75-01-4 | 1 ppm | 5 ppm | - | - |
| Vinyl cyanide (Acrylonitrile) | 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 CrO3) | Varies with compound | 0.05 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 | - | - |
Notes
Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 06-08-087, § 296-307-62625, filed 4/4/06, effective 9/1/06; 05-01-166, § 296-307-62625, filed 12/21/04, effective 4/2/05.
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