Wash. Admin. Code § 296-841-20025
Current through Register Vol. 24-23, December 1, 2024
IMPORTANT:
The following information applies to Table 3, Permissible Exposure Limits (PELs) for Airborne Contaminants.
The PNOR listing in Table 3 also applies to other partic-ulate airborne contaminants for which a specific PEL is NOT listed unless the airborne contaminant is found to require a lower limit.
| 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 (asbesti form) (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 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) (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) (see WAC 296-62-07460) | 106-99-0 | 1 ppm | 5 ppm | -- | -- |
| Butane | 106-97-8 | 800 ppm | 1,000 ppm | -- | -- |
| Butanethiol (Butyl mercaptan) | 109-79-5 | 0.5 ppm | 1.5 ppm | -- | -- |
| 2-Butanone (Methyl ethyl ketone) | 78-93-3 | 200 ppm | 300 ppm | -- | -- |
| 2-Butoxy ethanol (Butyl cellosolve) | 111-76-2 | 25 ppm | 38 ppm | -- | X |
| n-Butyl acetate | 123-86-4 | 150 ppm | 200 ppm | -- | -- |
| sec-Butyl acetate | 105-46-4 | 200 ppm | 250 ppm | -- | -- |
| tert-Butyl acetate | 540-88-5 | 200 ppm | 250 ppm | -- | -- |
| Butyl acrylate | 141-32-2 | 10 ppm | 20 ppm | -- | -- |
| n-Butyl alcohol | 71-36-3 | -- | -- | 50 ppm | X |
| sec-Butyl alcohol | 78-92-2 | 100 ppm | 150 ppm | -- | -- |
| tert-Butyl alcohol | 75-65-0 | 100 ppm | 150 ppm | -- | -- |
| Butylamine | 109-73-9 | -- | -- | 5 ppm | X |
| Butyl cellosolve (2-Butoxy ethanol) | 111-76-2 | 25 ppm | 38 ppm | -- | -- |
| tert-Butyl chromate (as Cr) (see WAC 296-62-08003) | 1189-85-1 | 0.005 mg/m3 | -- | 0.1 mg/m3 | X |
| n-Butyl glycidyl ether (BGE) | 2426-08-6 | 25 ppm | 38 ppm | -- | -- |
| n-Butyl lactate | 138-22-7 | 5 ppm | 10 ppm | - | -- |
| Butyl mercaptan | 109-79-5 | 0.5 ppm | 1.5 ppm | -- | -- |
| o-sec-Butylphenol | 89-72-5 | 5 ppm | 10 ppm | -- | X |
| p-tert-Butyl-toluene | 98-51-1 | 10 ppm | 20 ppm | -- | -- |
| Cadmium oxide fume (as Cd) (see WAC 296-62-074 and 296-155-174) | 1306-19-0 | 0.005 mg/m3 | -- | -- | -- |
| Cadmium dust and salts (as Cd) (see WAC 296-62-074 and 296-155-174) | 7440-43-9 | 0.005 mg/m3 | -- | -- | -- |
| Calcium arsenate (see chapter 296-848 WAC) | -- | 0.01 mg/m3 | -- | -- | -- |
| Calcium carbonate | 1317-65-3 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Calcium cyanamide | 156-62-7 | 0.5 mg/m3 | 1.5 mg/m3 | -- | -- |
| Calcium hydroxide | 1305-62-0 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Calcium oxide | 1305-78-8 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Calcium silicate | 1344-95-2 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Calcium sulfate | 7778-18-9 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Camphor (synthetic) | 76-22-2 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Caprolactam | 105-60-2 | -- | -- | -- | -- |
| Dust | -- | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Vapor | -- | 5 ppm | 10 ppm | -- | -- |
| Captafol (Difolatan) | 2425-06-1 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Captan | 133-06-2 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Carbaryl (Sevin) | 63-25-2 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Carbofuran (Furadon) | 1563-66-2 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Carbon black | 1333-86-4 | 3.5 mg/m3 | 7 mg/m3 | -- | -- |
| Carbon dioxide | 124-38-9 | 5,000 ppm | 30,000 ppm | -- | -- |
| Carbon disulfide | 75-15-0 | 4 ppm | 12 ppm | -- | X |
| Carbon monoxide | 630-08-0 | 35 ppm | 200 ppm (5 min.) | 1,500 ppm | -- |
| Carbon tetrabromide | 558-13-4 | 0.1 ppm | 0.3 ppm | -- | -- |
| Carbon tetrachloride (Tetrachloromethane) | 56-23-5 | 2 ppm | 4 ppm | -- | X |
| Carbonyl chloride (Phosgene) | 7803-51-2 | 0.1 ppm | 0.3 ppm | -- | -- |
| Carbonyl fluoride | 353-50-4 | 2 ppm | 5 ppm | -- | -- |
| Catechol (Pyrocatechol) | 120-80-9 | 5 ppm | 10 ppm | -- | X |
| Cellosolve acetate (2-Ethoxyethylacetate) | 111-15-9 | 5 ppm | 10 ppm | -- | X |
| Cellulose (paper fiber) | 9004-34-6 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Cesium hydroxide | 21351-79-1 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Chlordane | 57-74-9 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| Chlorinated camphene (Toxaphen) | 8001-35-2 | 0.5 mg/m3 | 1 mg/m3 | -- | X |
| Chlorinated diphenyl oxide | 55720-99-5 | 0.5 mg/m3 | 1.5 mg/m3 | -- | -- |
| Chlorine | 7782-50-5 | 0.5 ppm | -- | 1 ppm | -- |
| Chlorine dioxide | 10049-04-4 | 0.1 ppm | 0.3 ppm | -- | -- |
| Chlorine trifluoride | 7790-91-2 | -- | -- | 0.1 ppm | -- |
| Chloroacetaldehyde | 107-20-0 | -- | -- | 1 ppm | -- |
| a-Chloroacetophenone (Phenacyl chloride) | 532-21-4 | 0.05 ppm | 0.15 ppm | -- | -- |
| Chloroacetyl chloride | 79-04-9 | 0.05 ppm | 0.15 ppm | -- | -- |
| Chlorobenzene (Monochlorobenzene) | 108-90-7 | 75 ppm | 113 ppm | -- | -- |
| o-Chlorobenzylidene malononitrile (OCBM) | 2698-41-1 | -- | -- | 0.05 ppm | X |
| Chlorobromomethane | 74-97-5 | 200 ppm | 250 ppm | -- | -- |
| 2-Chloro-1, 3-butadiene (beta-Chloroprene) | 126-99-8 | 10 ppm | 20 ppm | -- | X |
| Chlorodifluoromethane | 75-45-6 | 1,000 ppm | 1,250 ppm | -- | -- |
| Chlorodiphenyl (42% Chlorine) (PCB) (Polychlorobiphenyls) | 53469-21-9 | 1 mg/m3 | 3 mg/m3 | -- | X |
| Chlorodiphenyl (54% Chlorine) (Polychlorobiphenyls (PCB)) | 11097-69-1 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| 1-Chloro-2, 3-epoxypropane (Epichlorhydrin) | 106-89-8 | 2 ppm | 4 ppm | -- | X |
| 2-Chloroethanol (Ethylene chlorohydrin) | 107-07-3 | -- | -- | 1 ppm | X |
| Chloroethylene (vinyl chloride) (see WAC 296-62-07329) | 75-01-4 | 1 ppm | 5 ppm | -- | -- |
| Chloroform (Trichloromethane) | 67-66-3 | 2 ppm | 4 ppm | -- | -- |
| 1-Chloro-1-nitropropane | 600-25-9 | 2 ppm | 4 ppm | -- | -- |
| bis-Chloromethyl ether (see WAC 296-62-073) | 542-88-1 | -- | -- | -- | -- |
| Chloromethyl methyl ether (Methyl chloromethyl ether) (see WAC 296-62-073) | 107-30-2 | -- | -- | -- | -- |
| Chloropentafluoroethane | 76-15-3 | 1,000 ppm | 1,250 ppm | -- | -- |
| Chloropicrin (Nitrotrichloromethane) | 76-06-2 | 0.1 ppm | 0.3 ppm | -- | -- |
| beta-Chloroprene (2-Chloro-1,3-butadiene) | 126-99-8 | 10 ppm | 20 ppm | -- | X |
| o-Chlorostyrene | 2039-87-4 | 50 ppm | 75 ppm | -- | -- |
| o-Chlorotoluene | 95-49-8 | 50 ppm | 75 ppm | -- | -- |
| 2-Chloro-6-trichloromethyl pyridine (Nitrapyrin) | 1929-82-4 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Chlorpyrifos | 2921-88-2 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Chromic acid and chromates (as Cr) (when the compound is not covered by WAC 296-62-08003) | Varies with compound | -- | -- | 0.1 mg/m3 | -- |
| Chromium | -- | -- | -- | -- | -- |
| Chromium (VI) compounds (as Cr) (when the compound is covered by WAC 296-62-08003) | -- | 0.005 mg/m3 | -- | -- | -- |
| Chromium metal or Chromium (II) compounds Or Chromium (III) compounds | 7440-47-3 | 0.5 mg/m3 | -- | -- | -- |
| Chromyl chloride (as Cr) (see WAC 296-62-08003) | 14977-61-8 | 0.005 mg/m3 | -- | -- | -- |
| Chrysene (Coal tar pitch volatiles) | 65996-93-2 | 0.2 mg/m3 | 0.6 mg/m3 | -- | -- |
| Chrysotile (as asbestos) (see WAC 296-62-077 and chapter 296-65 WAC) | -- | 0.1 f/cc | 1.0 f/cc (30 minutes) | -- | -- |
| Clopidol | 2971-90-6 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Coal dust (less than 5% SiO2) | -- | -- | -- | -- | -- |
| Respirable fraction | -- | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Coal dust (greater than or equal to 5% SiO2) | -- | -- | -- | -- | -- |
| Respirable fraction | -- | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Coal tar pitch volatiles (benzene soluble fraction) Acridine Anthracene Benzo (a) pyrene Chrysene Phenanthrene Pyrene | 65996-93-2 | 0.2 mg/m3 | 0.6 mg/m3 | -- | -- |
| Cobalt, metal fume & dust (as Co) | 7440-48-4 | 0.05 mg/m3 | 0.15 mg/m3 | -- | -- |
| Cobalt carbonyl (as Co) | 10210-68-1 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Cobalt hydrocarbonyl (as Co) | 16842-03-8 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Coke oven emissions (see WAC 296-62-200) | -- | 0.15 mg/m3 | -- | -- | -- |
| Copper (as Cu) | 7440-50-8 | -- | -- | -- | -- |
| Fume | -- | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Dusts and mists | -- | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Cotton dust (raw) (waste sorting, blending, cleaning, willowing and garetting) (see WAC 296-62-14533) | -- | 1 mg/m3 | -- | -- | -- |
| Corundum (Aluminum oxide) | 7429-90-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Crag herbicide (Sesone, Sodium-2, 4-dichloro-phenoxyethyl sulfate) | 136-78-7 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Cresol (all isomers) | 1319-77-3 | 5 ppm | 10 ppm | -- | X |
| Crocidolite (as asbestos) (see WAC 296-62-077 and chapter 296-65 WAC) | -- | 0.1 f/cc | 1.0 f/cc (30 minutes) | -- | -- |
| Crotonaldehyde | 123-73-9; 4170-30-3 | 2 ppm | 4 ppm | -- | -- |
| Crufomate | 299-86-5 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Cumene | 98-82-8 | 50 ppm | 75 ppm | -- | X |
| Cyanamide | 420-04-2 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Cyanide (as CN) | Varies with compound | 5 mg/m3 | 10 mg/m3 | -- | X |
| Cyanogen | 460-19-5 | 10 ppm | 20 ppm | -- | -- |
| Cyanogen chloride | 506-77-4 | -- | -- | 0.3 ppm | -- |
| Cyclohexane | 110-82-7 | 300 ppm | 375 ppm | -- | -- |
| Cyclohexanol | 108-93-0 | 50 ppm | 75 ppm | -- | X |
| Cyclohexanone | 108-94-1 | 25 ppm | 38 ppm | -- | X |
| Cyclohexene | 110-83-8 | 300 ppm | 375 ppm | -- | -- |
| Cyclohexylamine | 108-91-8 | 10 ppm | 20 ppm | -- | -- |
| Cyclonite (RDX) | 121-82-4 | 1.5 mg/m3 | 3.0 mg/m3 | -- | X |
| Cyclopentadiene | 542-92-7 | 75 ppm | 113 ppm | -- | -- |
| Cyclopentane | 287-92-3 | 600 ppm | 750 ppm | -- | -- |
| Cyhexatin (Tricyclohexyltin hydroxide) | 13121-70-5 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| 2,4-D (Dichlorophenoxy-acetic acid) | 94-75-7 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| DBCP (1,2-Dibromo-3-chloropropane) (see WAC 296-62-07342) | 96-12-8 | 0.001 ppm | -- | 0.005 ppm | -- |
| DDT (Dichlorodiphenyltri-chloroethane) | 50-29-3 | 1 mg/m3 | 3 mg/m3 | -- | X |
| DDVP, (Dichlorvos) | 62-73-7 | 0.1 ppm | 0.3 ppm | -- | X |
| Dasanit (Fensulfothion) | 115-90-2 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Decaborane | 17702-41-9 | 0.05 ppm | 0.15 ppm | -- | X |
| Demeton | 8065-48-3 | 0.01 ppm | 0.03 ppm | -- | X |
| Diacetone alcohol (4-hydroxy-4-methyl-2-pentanone) | 123-42-2 | 50 ppm | 75 ppm | -- | -- |
| 1, 2-Diaminoethane (Ethylenediamine) | 107-15-3 | 10 ppm | 20 ppm | -- | -- |
| Diazinon | 333-41-5 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Diazomethane | 334-88-3 | 0.2 ppm | 0.6 ppm | -- | -- |
| Diborane | 19287-45-7 | 0.1 ppm | 0.3 ppm | -- | -- |
| Dibrom (see Naled) | 300-76-5 | 3 mg/m3 | 6 mg/m3 | -- | X |
| 1, 2-Dibromo-3-chloropropane (DBCP) (see WAC 296-62-07342) | 96-12-8 | 0.001 ppm | -- | 0.005 ppm | -- |
| 2-N-Dibutylamino ethanol | 102-81-8 | 2 ppm | 4 ppm | -- | X |
| Dibutyl phosphate | 107-66-4 | 1 ppm | 2 ppm | -- | -- |
| Dibutyl phthalate | 84-74-2 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Dichloroacetylene | 7572-29-4 | -- | --- | 0.1 ppm | -- |
| o-Dichlorobenzene | 95-50-1 | -- | -- | 50 ppm | -- |
| p-Dichlorobenzene | 106-46-7 | 75 ppm | 110 ppm | -- | -- |
| 3, 3'-Dichlorobenzidine (see WAC 296-62-073) | 91-94-1 | -- | -- | -- | -- |
| Dichlorodiphenyltri-chloroethane (DDT) | 50-29-3 | 1 mg/m3 | 3 mg/m3 | -- | X |
| Dichlorodifluoromethane | 75-71-8 | 1,000 ppm | 1,250 ppm | -- | -- |
| 1, 3-Dichloro-5, 5-dimethyl hydantoin | 118-52-5 | 0.2 mg/m3 | 0.4 mg/m3 | -- | -- |
| 1, 1-Dichloroethane (Ethylidine chloride) | 75-34-3 | 100 ppm | 150 ppm | -- | -- |
| 1, 2-Dichloroethane (Ethylene dichloride) | 107-06-2 | 1 ppm | 2 ppm | -- | -- |
| 1, 1-Dichloroethylene (Vinylidene chloride) | 75-35-4 | 1 ppm | 3 ppm | -- | -- |
| 1, 2-Dichloroethylene (Acetylene dichloride) | 540-59-0 | 200 ppm | 250 ppm | -- | -- |
| Dichloroethyl ether | 111-44-4 | 5 ppm | 10 ppm | -- | X |
| Dichlorofluoromethane | 75-43-4 | 10 ppm | 20 ppm | -- | -- |
| Dichloromethane (Methylene chloride) (see chapter 296-859 WAC) | 75-09-2 | 25 ppm | 125 ppm | -- | -- |
| 1, 1-Dichloro-1-nitroethane | 594-72-9 | 2 ppm | 10 ppm | -- | -- |
| Dichlorophenoxyacetic acid (2, 4-D) | 94-75-7 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| 1, 2-Dichloropropane (Propylene dichloride) | 78-87-5 | 75 ppm | 110 ppm | -- | -- |
| Dichloropropene | 542-75-6 | 1 ppm | 3 ppm | -- | X |
| 2, 2-Dichloropropionic acid | 75-99-0 | 1 ppm | 3 ppm | -- | -- |
| Dichlorotetrafluoroethane | 76-14-2 | 1,000 ppm | 1,250 ppm | -- | -- |
| Dichlorvos (DDVP) | 62-73-7 | 0.1 ppm | 0.3 ppm | -- | X |
| Dicrotophos | 141-66-2 | 0.25 mg/m3 | 0.75 mg/m3 | -- | X |
| Dicyclopentadiene | 77-73-6 | 5 ppm | 10 ppm | -- | -- |
| Dicyclopentadienyl iron | 102-54-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Dieldrin | 60-57-1 | 0.25 mg/m3 | 0.75 mg/m3 | -- | X |
| Diethanolamine | 111-42-2 | 3 ppm | 6 ppm | -- | -- |
| Diethylamine | 109-89-7 | 10 ppm | 25 ppm | -- | -- |
| 2-Diethylaminoethanol | 100-37-8 | 10 ppm | 20 ppm | -- | X |
| Diethylene triamine | 111-40-0 | 1 ppm | 3 ppm | -- | X |
| Diethyl ether (Ethyl ether) | 60-29-7 | 400 ppm | 500 ppm | -- | -- |
| Diethyl ketone | 96-22-0 | 200 ppm | 250 ppm | -- | -- |
| Diethyl phthalate | 84-66-2 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Difluorodibromomethane | 75-61-6 | 100 ppm | 150 ppm | -- | -- |
| Difolatan (Captafol) | 2425-06-1 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Diglycidyl ether (DGE) | 2238-07-5 | 0.1 ppm | 0.3 ppm | -- | -- |
| Dihydroxybenzene (Hydroquinone) | 123-31-9 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Diisobutyl ketone (2, 6-Dimethylheptanone) | 108-83-8 | 25 ppm | 38 ppm | -- | -- |
| Diisopropylamine | 108-18-9 | 5 ppm | 10 ppm | -- | X |
| Dimethoxymethane (Methylal) | 109-87-5 | 1,000 ppm | 1,250 ppm | -- | -- |
| Dimethyl acetamide | 127-19-5 | 10 ppm | 20 ppm | -- | X |
| Dimethylamine | 124-40-3 | 10 ppm | 20 ppm | -- | -- |
| 4-Dimethylaminoazo benzene (see WAC 296-62-073) | 60-11-7 | -- | -- | -- | -- |
| Dimethylaminobenzene (Xylidene) | 1300-73-8 | 2 ppm | 4 ppm | -- | X |
| Dimethylaniline (N, N-Dimethylaniline) | 121-69-7 | 5 ppm | 10 ppm | -- | X |
| Dimethylbenzene (Xylene) | 1300-73-8 | 100 ppm | 150 ppm | -- | -- |
| Dimethyl-1, 2-dibromo-2,2-dichloroethyl phosphate (Naled) | 300-76-5 | 3 mg/m3 | 6 mg/m3 | -- | X |
| Dimethylformamide | 68-12-2 | 10 ppm | 20 ppm | -- | X |
| 2, 6-Dimethylheptanone (Diisobutyl ketone) | 108-83-8 | 25 ppm | 38 ppm | -- | -- |
| 1, 1-Dimethylhydrazine | 57-14-7 | 0.5 ppm | 1.5 ppm | -- | X |
| Dimethyl phthalate | 131-11-3 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Dimethyl sulfate | 77-78-1 | 0.1 ppm | 0.3 ppm | -- | X |
| Dinitolmide (3, 5-Dinitro-o-toluamide) | 148-01-6 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Dinitrobenzene (all isomers -alpha, meta and para) | 528-29-0; 99-65-0; 100-25-4 | 0.15 ppm | 0.45 ppm | -- | X |
| Dinitro-o-cresol | 534-52-1 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| 3, 5-Dinitro-o-toluamide (Dinitolmide) | 148-01-6 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Dinitrotoluene | 25321-14-6 | 1.5 mg/m3 | 3 mg/m3 | -- | X |
| Dioxane (Diethylene dioxide) | 123-91-1 | 25 ppm | 38 ppm | -- | X |
| Dioxathion | 78-34-2 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Diphenyl (Biphenyl) | 92-52-4 | 0.2 ppm | 0.6 ppm | -- | -- |
| Diphenylamine | 122-39-4 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Diphenylmethane diisocyanate (Methylene bisphenyl isocyanate (MDI)) | 101-68-8 | -- | -- | 0.02 ppm | -- |
| Dipropylene glycol methyl ether | 34590-94-8 | 100 ppm | 150 ppm | -- | X |
| Dipropyl ketone | 123-19-3 | 50 ppm | 75 ppm | -- | -- |
| Diquat | 85-00-7 | 0.5 mg/m3 | 1.5 mg/m3 | -- | -- |
| Di-sec, Octyl phthalate (Di-2-ethylhexylphthalate) | 117-81-7 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Disulfram | 97-77-8 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Disulfoton | 298-04-4 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| 2, 6-Di-tert-butyl-p-cresol | 128-37-0 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Diuron | 330-54-1 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Divinyl benzene | 1321-74-0 | 10 ppm | 20 ppm | -- | -- |
| Emery | 12415-34-8 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Endosulfan (Thiodan) | 115-29-7 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Endrin | 72-20-8 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Epichlorhydrin (1-Chloro-2,3-epoxypropane) | 106-89-8 | 2 ppm | 4 ppm | -- | X |
| EPN | 2104-64-5 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| 1, 2-Epoxypropane (Propylene oxide) | 75-56-9 | 20 ppm | 30 ppm | -- | -- |
| 2, 3-Epoxy-1-propanol (Glycidol) | 556-52-5 | 25 ppm | 38 ppm | -- | -- |
| Ethane | -- | Simple asphyxiant | -- | -- | -- |
| Ethanethiol (Ethyl mercaptan) | 75-08-1 | 0.5 ppm | 1.5 ppm | -- | -- |
| Ethanol (Ethyl alcohol) | 64-17-5 | 1,000 ppm | 1,250 ppm | -- | -- |
| Ethanolamine (2-Aminoethanol) | 141-43-5 | 3 ppm | 6 ppm | -- | -- |
| Ethion | 563-12-2 | 0.4 mg/m3 | 1.2 mg/m3 | -- | X |
| 2-Ethoxyethanol (Glycol monoethyl ether) | 110-80-5 | 5 ppm | 10 ppm | -- | X |
| 2-Ethoxyethyl acetate (Cellosolve acetate) | 111-15-9 | 5 ppm | 10 ppm | -- | X |
| Ethyl acetate | 141-78-6 | 400 ppm | 500 ppm | -- | -- |
| Ethyl acrylate | 140-88-5 | 5 ppm | 25 ppm | -- | X |
| Ethyl alcohol (ethanol) | 64-17-5 | 1,000 ppm | 1,250 ppm | -- | -- |
| Ethylamine | 75-04-07 | 10 ppm | 20 ppm | -- | -- |
| Ethyl amyl ketone (5-Methyl-3-hepatone) | 541-85-5 | 25 ppm | 38 ppm | -- | -- |
| Ethyl benzene | 100-41-4 | 100 ppm | 125 ppm | -- | -- |
| Ethyl bromide | 74-96-4 | 200 ppm | 250 ppm | -- | -- |
| Ethyl butyl ketone (3-Heptanone) | 106-35-4 | 50 ppm | 75 ppm | -- | -- |
| Ethyl chloride | 75-00-3 | 1,000 ppm | 1,250 ppm | -- | -- |
| Ethylene | 74-85-1 | Simple asphyxiant | -- | -- | -- |
| Ethylene chlorohydrin (2-Chloroethanol) | 107-07-3 | -- | -- | 1 ppm | X |
| Ethylenediamine (1, 2-Diaminoethane) | 107-15-3 | 10 ppm | 20 ppm | -- | X |
| Ethylene dibromide | 106-93-4 | 0.1 ppm | 0.5 ppm | -- | -- |
| Ethylene dichloride (1, 2-Dichloroethane) | 107-06-2 | 1 ppm | 2 ppm | -- | -- |
| Ethylene glycol | 107-21-1 | -- | -- | 50 ppm | -- |
| Ethylene glycol dinitrate | 628-96-6 | -- | 0.1 mg/m3 | -- | X |
| Ethylene glycol monomethyl ether acetate (Methyl cellosolve acetate) | -- | 5 ppm | 10 ppm | -- | X |
| Ethyleneimine (see WAC 296-62-073) | 151-56-4 | -- | -- | -- | X |
| Ethylene oxide (see chapter 296-855 WAC) | 75-21-8 | 1 ppm | 5 ppm | -- | -- |
| Ethyl ether (Diethyl ether) | 60-29-7 | 400 ppm | 500 ppm | -- | -- |
| Ethyl formate | 109-94-4 | 100 ppm | 125 ppm | -- | -- |
| Ethylidine chloride (1, 1-Dichloroethane) | 107-06-2 | 1 ppm | 2 ppm | -- | -- |
| Ethylidene norbornene | 16219-75-3 | -- | -- | 5.0 ppm | -- |
| Ethyl mercaptan (Ethanethiol) | 75-08-1 | 0.5 ppm | 1.5 ppm | -- | -- |
| n-Ethylmorpholine | 100-74-3 | 5 ppm | 10 ppm | -- | X |
| Ethyl sec-amyl ketone (5-methyl-3-heptanone) | 541-85-5 | 25 ppm | 38 ppm | -- | -- |
| Ethyl silicate | 78-10-4 | 10 ppm | 20 ppm | -- | -- |
| Fenamiphos | 22224-92-6 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Fensulfothion (Dasanit) | 115-90-2 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Fenthion | 55-38-9 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Ferbam | -- | -- | -- | -- | -- |
| Total particulate | 14484-64-1 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Ferrovanadium dust | 12604-58-9 | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Fluorides (as F) | Varies with compound | 2.5 mg/m3 | 5 mg/m3 | -- | -- |
| Fluorine | 7782-41-4 | 0.1 ppm | 0.3 ppm | -- | -- |
| Fluorotrichloromethane (see Trichlorofluoro methane) | 75-69-4 | -- | -- | 1,000 ppm | -- |
| Fonofos | 944-22-9 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Formaldehyde (see chapter 296-856 WAC) | 50-00-0 | 0.75 ppm | 2 ppm | -- | -- |
| Formamide | 75-12-7 | 20 ppm | 30 ppm | -- | -- |
| Formic acid | 64-18-6 | 5 ppm | 10 ppm | -- | -- |
| Furadon (carbofuran) | 1563-66-2 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Furfural | 98-01-1 | 2 ppm | 4 ppm | -- | X |
| Furfuryl alcohol | 98-00-0 | 10 ppm | 15 ppm | -- | X |
| Gasoline | 8006-61-9 | 300 ppm | 500 ppm | -- | -- |
| Germanium tetrahydride | 7782-65-2 | 0.2 ppm | 0.6 ppm | -- | -- |
| Glass, fibrous or dust | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Glutaraldehyde | 111-30-8 | -- | -- | 0.2 ppm | -- |
| Glycerin mist | 56-81-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Glycidol (2, 3-Epoxy-1-propanol) | 556-52-5 | 25 ppm | 38 ppm | -- | -- |
| Glycol monoethyl ether (2-Ethoxyethanol) | 110-80-5 | 5 ppm | 10 ppm | -- | X |
| Grain dust (oat, wheat, barley) | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Graphite, natural | 7782-42-5 | -- | -- | -- | -- |
| Respirable particulate | -- | 2.5 mg/m3 | 5 mg/m3 | -- | -- |
| Graphite, synthetic | -- | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Guthion (Azinphosmethyl) | 86-50-0 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Gypsum | 13397-24-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Hafnium | 7440-58-6 | 0.5 mg/m3 | 1.5 mg/m3 | -- | -- |
| Helium | -- | Simple asphyxiant | -- | -- | -- |
| Heptachlor | 76-44-8 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| Heptane (n-heptane) | 142-82-5 | 400 ppm | 500 ppm | -- | -- |
| 2-Heptanone (Methyl n-amyl ketone) | 110-43-0 | 50 ppm | 75 ppm | -- | -- |
| 3-Heptanone (Ethyl butyl ketone) | 106-35-4 | 50 ppm | 75 ppm | -- | -- |
| Hexachlorobutadiene | 87-68-3 | 0.02 ppm | 0.06 ppm | -- | X |
| Hexachlorocyclopentadiene | 77-47-4 | 0.01 ppm | 0.03 ppm | -- | -- |
| Hexachloroethane | 67-72-1 | 1 ppm | 3 ppm | -- | X |
| Hexachloronaphthalene | 1335-87-1 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Hexafluoroacetone | 684-16-2 | 0.1 ppm | 0.3 ppm | -- | X |
| Hexane | -- | -- | -- | -- | -- |
| n-hexane | 110-54-3 | 50 ppm | 75 ppm | -- | -- |
| other isomers | Varies with compound | 500 ppm | 1,000 ppm | -- | -- |
| 2-Hexanone (Methyl-n-butyl ketone) | 591-78-6 | 5 ppm | 10 ppm | -- | -- |
| Hexone (Methyl isobutyl ketone) | 108-10-1 | 50 ppm | 75 ppm | -- | -- |
| sec-Hexyl acetate | 108-84-9 | 50 ppm | 75 ppm | -- | -- |
| Hexylene glycol | 107-41-5 | -- | -- | 25 ppm | -- |
| Hydrazine | 302-01-2 | 0.1 ppm | 0.3 ppm | -- | X |
| Hydrogen | -- | Simple asphyxiant | -- | -- | -- |
| Hydrogenated terphenyls | 61788-32-7 | 0.5 ppm | 1.5 ppm | -- | -- |
| Hydrogen bromide | 10035-10-6 | -- | -- | 3.0 ppm | -- |
| Hydrogen chloride | 7647-01-0 | -- | -- | 5.0 ppm | -- |
| Hydrogen cyanide | 74-90-8 | -- | 4.7 ppm | -- | X |
| Hydrogen fluoride | 7664-39-3 | -- | -- | 3 ppm | -- |
| Hydrogen peroxide | 7722-84-1 | 1 ppm | 3 ppm | -- | -- |
| Hydrogen selenide (as Se) | 7783-07-5 | 0.05 ppm | 0.15 ppm | -- | -- |
| Hydrogen sulfide | 7783-06-4 | 10 ppm | 15 ppm | -- | -- |
| Hydroquinone (Dihydroxybenzene) | 123-31-9 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| 4-Hydroxy-4-methyl-2-pentanone (Diacetone alcohol) | 123-42-2 | 50 ppm | 75 ppm | -- | -- |
| 2-Hydroxypropyl acrylate | 99-61-1 | 0.5 ppm | 1.5 ppm | -- | X |
| Indene | 95-13-6 | 10 ppm | 20 ppm | -- | -- |
| Indium and compounds (as In) | 7440-74-6 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Iodine | 7553-56-2 | -- | -- | 0.1 ppm | -- |
| Iodoform | 75-47-8 | 0.6 ppm | 1.8 ppm | -- | -- |
| Iron oxide dust and fume (as Fe) | 1309-37-1 | -- | -- | -- | -- |
| Total particulate | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Iron pentacarbonyl (as Fe) | 13463-40-6 | 0.1 ppm | 0.2 ppm | -- | -- |
| Iron salts, soluble (as Fe) | Varies with compound | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Isoamyl acetate | 123-92-2 | 100 ppm | 150 ppm | -- | -- |
| Isoamyl alcohol (primary and secondary) | 123-51-3 | 100 ppm | 125 ppm | -- | -- |
| Isobutyl acetate | 110-19-0 | 150 ppm | 188 ppm | -- | -- |
| Isobutyl alcohol | 78-83-1 | 50 ppm | 75 ppm | -- | -- |
| Isooctyl alcohol | 26952-21-6 | 50 ppm | 75 ppm | -- | X |
| Isophorone | 78-59-1 | 4 ppm | -- | 5 ppm | -- |
| Isophorone diisocyanate | 4098-71-9 | 0.005 ppm | 0.02 ppm | -- | X |
| Isopropoxyethanol | 109-59-1 | 25 ppm | 38 ppm | -- | -- |
| Isopropyl acetate | 108-21-4 | 250 ppm | 310 ppm | -- | -- |
| Isopropyl alcohol | 67-63-0 | 400 ppm | 500 ppm | -- | -- |
| Isopropylamine | 75-31-0 | 5 ppm | 10 ppm | -- | -- |
| N-Isopropylaniline | 768-52-5 | 2 ppm | 4 ppm | -- | X |
| Isopropyl ether | 108-20-3 | 250 ppm | 313 ppm | -- | -- |
| Isopropyl glycidyl ether (IGE) | 4016-14-2 | 50 ppm | 75 ppm | --- | -- |
| Kaolin | -- | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Ketene | 463-51-4 | 0.5 mg/m3 | 1.5 mg/m3 | -- | -- |
| Lannate (Methomyl) | 16752-77-5 | 2.5 mg/m3 | 5 mg/m3 | -- | -- |
| Lead, inorganic (as Pb) (see WAC 296-62-07521 and 296-155-176) | 7439-92-1 | 0.05 mg/m3 | -- | -- | -- |
| Lead arsenate (as Pb) (see WAC 296-62-07521, 296-155-176, and chapter 296-848 WAC) | 3687-31-8 | 0.05 mg/m3 | -- | -- | -- |
| Lead chromate (as Pb) (see WAC 296-62-08003, 296-62-07521, and 296-155-176) | 7758-97-6 | 0.05 mg/m3 | -- | -- | -- |
| Limestone | 1317-65-3 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Lindane | 58-89-9 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| Lithium hydride | 7580-67-8 | 0.025 mg/m3 | 0.075 mg/m3 | -- | -- |
| L.P.G. (liquified petroleum gas) | 68476-85-7 | 1,000 ppm | 1,250 ppm | -- | -- |
| Magnesite | 546-93-0 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Magnesium oxide fume | 1309-48-4 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Malathion | 121-75-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | X |
| Maleic anhydride | 108-31-6 | 0.25 ppm | 0.75 ppm | -- | -- |
| Manganese and compounds (as Mn) | 7439-96-5 | -- | -- | 5 mg/m3 | -- |
| Manganese cyclopentadienyl tricarbonyl (as Mn) | 12079-65-1 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Manganese tetroxide and fume (as Mn) | 7439-96-5 | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Marble | 1317-65-3 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| MBOCA (4, 4'-Methylene bis (2-chloro-aniline)) (see WAC 296-62-073) | 101-14-4 | -- | -- | -- | X |
| MDA (4, 4-Methylene dianiline) (see WAC 296-62-076 and 296-155-173) | 101-77-9 | 0.01 ppm | 0.1 ppm | -- | X |
| MDI (Methylene bisphenyl isocyanate) (Diphenylmethane diisocyanate) | 101-68-8 | -- | -- | 0.02 ppm | -- |
| MEK (Methyl ethyl ketone) (2-Butanone) | 78-93-3 | 200 ppm | 300 ppm | -- | -- |
| MEKP (Methyl ethyl ketone peroxide) | 1338-23-4 | -- | -- | 0.2 ppm | -- |
| Mercury (as Hg) | 7439-97-6 | -- | -- | -- | -- |
| Aryl and inorganic | -- | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Organo-alkyl compounds | -- | 0.01 mg/m3 | 0.03 mg/m3 | -- | X |
| Vap o r | -- | 0.05 mg/m3 | 0.15 mg/m3 | -- | X |
| Mesityl oxide | 141-79-7 | 15 ppm | 25 ppm | -- | -- |
| Methacrylic acid | 79-41-4 | 20 ppm | 30 ppm | -- | X |
| Methane | -- | Simple asphyxiant | -- | -- | -- |
| Methanethiol (Methyl mercaptan) | 74-93-1 | 0.5 ppm | 1.5 ppm | -- | -- |
| Methanol (Methyl alcohol) | 67-56-1 | 200 ppm | 250 ppm | -- | X |
| Methomyl (lannate) | 16752-77-5 | 2.5 mg/m3 | 5 mg/m3 | -- | -- |
| Methoxychlor | 72-43-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| 2-Methoxyethanol (Methyl cellosolve) | 109-86-4 | 5 ppm | 10 ppm | -- | X |
| 2-Methoxyethyl acetate (Methyl cellosolve acetate) | 110-49-6 | 5 ppm | 10 ppm | -- | X |
| 4-Methoxyphenol | 150-76-5 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Methyl acetate | 79-20-9 | 200 ppm | 250 ppm | -- | -- |
| Methyl acetylene (propyne) | 74-99-7 | 1,000 ppm | 1,250 ppm | -- | -- |
| Methyl acetylene-propadiene mixture (MAPP) | -- | 1,000 ppm | 1,250 ppm | -- | -- |
| Methyl acrylate | 96-33-3 | 10 ppm | 20 ppm | -- | X |
| Methylacrylonitrile | 126-98-7 | 1 ppm | 3 ppm | -- | X |
| Methylal (Dimethoxy-methane) | 109-87-5 | 1,000 ppm | 1,250 ppm | -- | -- |
| Methyl alcohol (methanol) | 67-56-1 | 200 ppm | 250 ppm | -- | X |
| Methylamine | 74-89-5 | 10 ppm | 20 ppm | -- | -- |
| Methyl amyl alcohol (Methyl isobutyl carbinol) | 108-11-2 | 25 ppm | 40 ppm | -- | X |
| Methyl n-amyl ketone (2-Heptanone) | 110-43-0 | 50 ppm | 75 ppm | -- | -- |
| N-Methyl aniline (Monomethyl aniline) | 100-61-8 | 0.5 ppm | 1.5 ppm | -- | X |
| Methyl bromide | 74-83-9 | 5 ppm | 10 ppm | -- | X |
| Methyl-n-butyl ketone (2-Hexanone) | 591-78-6 | 5 ppm | 10 ppm | -- | -- |
| Methyl cellosolve (2-Methoxyethanol) | 109-86-4 | 5 ppm | 10 ppm | -- | X |
| Methyl cellosolve acetate (2-Methoxyethyl acetate) | 110-49-6 | 5 ppm | 10 ppm | -- | X |
| Methyl chloride | 74-87-3 | 50 ppm | 100 ppm | -- | -- |
| Methyl chloroform (1, 1, 1-trichlorethane) | 71-55-6 | 350 ppm | 450 ppm | -- | -- |
| Methyl chloromethyl ether (chloromethyl methyl ether) (see WAC 296-62-073) | 107-30-2 | -- | -- | -- | -- |
| Methyl 2-cyanoacrylate | 137-05-3 | 2 ppm | 4 ppm | -- | -- |
| Methylcyclohexane | 108-87-2 | 400 ppm | 500 ppm | -- | -- |
| Methylcyclohexanol | 25639-42-3 | 50 ppm | 75 ppm | -- | -- |
| Methylcyclohexanone | 583-60-8 | 50 ppm | 75 ppm | -- | X |
| Methylcyclopentadienyl manganese tricarbonyl (as Mn) | 12108-13-3 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Methyl demeton | 8022-00-2 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| Methylene bisphenyl isocyanate (MDI) (Diphenylmethane diisocyanate) | 101-68-8 | -- | -- | 0.02 ppm | -- |
| 4, 4'-Methylene bis (2-chloro-aniline) (MBOCA) (see WAC 296-62-073) | 101-14-4 | -- | -- | -- | X |
| Methylene bis (4-cyclohexylisocyanate) | 5124-30-1 | -- | -- | 0.01 ppm | -- |
| Methylene chloride (Dichloromethane) (see chapter 296-859 WAC) | 75-09-2 | 25 ppm | 125 ppm | -- | -- |
| 4, 4-Methylene dianiline (MDA) (see WAC 296-62-076 and 296-155-173) | 101-77-9 | 0.01 ppm | 0.1 ppm | -- | X |
| Methyl ethyl ketone (MEK) (2-Butanone) | 78-93-3 | 200 ppm | 300 ppm | -- | -- |
| Methyl ethyl ketone peroxide (MEKP) | 1338-23-4 | -- | -- | 0.2 ppm | -- |
| Methyl formate | 107-31-3 | 100 ppm | 150 ppm | -- | -- |
| 5-Methyl-3-heptanone (Ethyl amyl ketone) | 541-85-5 | 25 ppm | 38 ppm | -- | -- |
| Methyl hydrazine (Monomethyl hydrazine) | 60-34-4 | -- | -- | 0.2 ppm | X |
| Methyl iodide | 74-88-4 | 2 ppm | 4 ppm | -- | X |
| Methyl isoamyl ketone | 110-12-3 | 50 ppm | 75 ppm | -- | -- |
| Methyl isobutyl carbinol (Methyl amyl alcohol) | 108-11-2 | 25 ppm | 40 ppm | -- | X |
| Methyl isobutyl ketone (Hexone) | 108-10-1 | 50 ppm | 75 ppm | -- | -- |
| Methyl isocyanate | 624-83-9 | 0.02 ppm | 0.06 ppm | -- | X |
| Methyl isopropyl ketone | 563-80-4 | 200 ppm | 250 ppm | -- | -- |
| Methyl mercaptan (Methanethiol) | 74-93-1 | 0.5 ppm | 1.5 ppm | -- | -- |
| Methyl methacrylate | 80-62-6 | 100 ppm | 150 ppm | -- | -- |
| Methyl parathion | 298-00-0 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Methyl propyl ketone (2-Pentanone) | 107-87-9 | 200 ppm | 250 ppm | -- | -- |
| Methyl silicate | 684-84-5 | 1 ppm | 3 ppm | -- | -- |
| alpha-Methyl styrene | 98-83-9 | 50 ppm | 100 ppm | -- | -- |
| Mevinphos (Phosdrin) | 7786-34-7 | 0.01 ppm | 0.03 ppm | -- | X |
| Metribuzin | 21087-64-9 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Mica (Silicates) Respirable fraction | 12001-26-2 | 3 mg/m3 | 6 mg/m3 | -- | -- |
| Molybdenum (as Mo) | 7439-98-7 | -- | -- | -- | -- |
| Soluble compounds | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Insoluble compounds | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Monochlorobenzene (Chlorobenzene) | 108-90-7 | 75 ppm | 113 ppm | -- | -- |
| Monocrotophos (Azodrin) | 6923-22-4 | 0.25 mg/m3 | 0.75 mg/m3 | -- | -- |
| Monomethyl aniline (N-Methyl aniline) | 100-61-8 | 0.5 ppm | 1.5 ppm | -- | X |
| Monomethyl hydrazine | -- | -- | -- | 0.2 ppm | -- |
| Morpholine | 110-91-8 | 20 ppm | 30 ppm | -- | X |
| Naled (Dibrom) | 300-76-5 | 3 mg/m3 | 6 mg/m3 | -- | X |
| Naphtha | 8030-30-6 | 100 ppm | 150 ppm | -- | X |
| Naphthalene | 91-20-3 | 10 ppm | 15 ppm | -- | -- |
| alpha-Naphthylamine (see WAC 296-62-073) | 134-32-7 | -- | -- | -- | -- |
| beta-Naphthylamine (see WAC 296-62-073) | 91-59-8 | -- | -- | -- | -- |
| Neon | 7440-01-9 | Simple asphyxiant | -- | -- | -- |
| Nickel carbonyl (as Ni) | 13463-39-3 | 0.001 ppm | 0.003 ppm | -- | -- |
| Nickel (as Ni) | 7440-02-0 | -- | -- | -- | -- |
| Metal and insoluble compounds | -- | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Soluble compounds | -- | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Nicotine | 54-11-5 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| Nitrapyrin (2-Chloro-6 trichloromethyl pyridine) | 1929-82-4 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Nitric acid | 7697-37-2 | 2 ppm | 4 ppm | -- | -- |
| Nitric oxide | 10102-43-9 | 25 ppm | 38 ppm | -- | -- |
| p-Nitroaniline | 100-01-6 | 3 mg/m3 | 6 mg/m3 | -- | X |
| Nitrobenzene | 98-95-3 | 1 ppm | 3 ppm | -- | X |
| 4-Nitrobiphenyl (see WAC 296-62-073) | 92-93-3 | -- | -- | -- | -- |
| p-Nitrochlorobenzene | 100-00-5 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| 4-Nitrodiphenyl (see WAC 296-62-073) | -- | -- | -- | -- | -- |
| Nitroethane | 79-24-3 | 100 ppm | 150 ppm | -- | -- |
| Nitrogen | 7727-37-9 | Simple asphyxiant | -- | -- | -- |
| Nitrogen dioxide | 10102-44-0 | -- | 1 ppm | -- | -- |
| Nitrogen oxide (Nitrous oxide) | 10024-97-2 | 50 ppm | 75 ppm | -- | -- |
| Nitrogen trifluoride | 7783-54-2 | 10 ppm | 20 ppm | -- | -- |
| Nitroglycerin | 55-63-0 | -- | 0.1 mg/m3 | -- | X |
| Nitromethane | 75-52-5 | 100 ppm | 150 ppm | -- | -- |
| 1-Nitropropane | 108-03-2 | 25 ppm | 38 ppm | -- | -- |
| 2-Nitropropane | 79-46-9 | 10 ppm | 20 ppm | -- | -- |
| N-Nitrosodimethylamine (see WAC 296-62-073) | 62-75-9 | -- | -- | -- | -- |
| Nitrotoluene | -- | -- | -- | -- | -- |
| o-isomer | 88-72-2 | 2 ppm | 4 ppm | -- | X |
| m-isomer | 98-08-2 | 2 ppm | 4 ppm | -- | X |
| p-isomer | 99-99-0 | 2 ppm | 4 ppm | -- | X |
| Nitrotrichloromethane (Chloropicrin) | 76-06-2 | 0.1 ppm | 0.3 ppm | -- | -- |
| Nitrous oxide (Nitrogen oxide) | 10024-97-2 | 50 ppm | 75 ppm | -- | -- |
| Nonane | 111-84-2 | 200 ppm | 250 ppm | -- | -- |
| Nuisance dusts (see Particulates not otherwise regulated) | -- | -- | -- | -- | -- |
| Octachloronaphthalene | 2234-13-1 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Octane | 111-65-9 | 300 ppm | 375 ppm | -- | -- |
| Oil mist mineral (particulate) | 8012-95-1 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Osmium tetroxide (as Os) | 20816-12-0 | 0.0002 ppm | 0.0006 ppm | -- | -- |
| Oxalic acid | 144-62-7 | 1 mg/m3 | 2 mg/m3 | -- | -- |
| Oxygen See requirements in other chapters such as: Chapter 296-809 WAC, Confined spaces; chapter 296-843 WAC, Hazardous waste operations; chapter 296-824 WAC, Emergency response; WAC 296-62-100, Oxygen deficient atmospheres | -- | -- | -- | -- | -- |
| Oxygen difluoride | 7783-41-7 | -- | -- | 0.05 ppm | -- |
| Ozone | 10028-15-6 | 0.1 ppm | 0.3 ppm | -- | -- |
| Paper fiber (Cellulose) | 9004-34-6 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Paraffin wax fume | 8002-74-2 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Paraquat | -- | -- | -- | -- | -- |
| Respirable fraction | 4685-14-7 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 (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 Applies 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 fraction Applies 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 fraction Applies 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) (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 sbestos) | -- | -- | -- | -- | -- |
| Respirable fraction | 14807-96-6 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Tremolite (asbestiform) (as asbestos) (see WAC 296-62-07705 and chapter 296-65 WAC) | -- | 0.1 f/cc | 1.0 f/cc (30 minutes) | -- | -- |
| Silicon | 7440-21-3 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Silicon carbide | 409-21-2 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Silicon tetrahydride (Silane) | 7803-62-5 | 5 ppm | 10 ppm | -- | -- |
| Silver, metal dust and soluble compounds (as Ag) | 7440-22-4 | 0.01 mg/m3 | 0.03 mg/m3 | -- | -- |
| Soapstone | -- | -- | -- | -- | -- |
| Total particulate | -- | 6 mg/m3 | 12 mg/m3 | -- | -- |
| Respirable fraction | -- | 3 mg/m3 | 6 mg/m3 | -- | -- |
| Sodium azide (as HN3 or NaN3) | 26628-22-8 | -- | -- | 0.1 ppm | X |
| Sodium bisulfite | 7631-90-5 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Sodium-2, 4-dichloro-phenoxyethyl sulfate (Crag herbicide) | 136-78-7 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Sodium fluoroacetate | 62-74-8 | 0.05 mg/m3 | 0.15 mg/m3 | -- | X |
| Sodium hydroxide | 1310-73-2 | -- | -- | 2 mg/m3 | -- |
| Sodium metabisulfite | 7681-57-4 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Starch | 9005-25-8 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Stibine | 7803-52-3 | 0.1 ppm | 0.3 ppm | -- | -- |
| Stoddard solvent | 8052-41-3 | 100 ppm | 150 ppm | -- | -- |
| Strychnine | 57-24-9 | 0.15 mg/m3 | 0.45 mg/m3 | -- | -- |
| Styrene (Phenylethylene, Vinyl benzene) | 100-42-5 | 50 ppm | 100 ppm | -- | -- |
| Subtilisins | 9014-01-1 | -- | 0.00006 mg/m3 | -- | -- |
| (60 min.) | |||||
| Sucrose | 57-50-1 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Sulfotep (TEDP) | 3689-24-5 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Sulfur dioxide | 7446-09-5 | 2 ppm | 5 ppm | -- | -- |
| Sulfur hexafluoride | 2551-62-4 | 1,000 ppm | 1,250 ppm | -- | -- |
| Sulfuric acid | 7664-93-9 | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Sulfur monochloride | 10025-67-9 | -- | -- | 1 ppm | -- |
| Sulfur pentafluoride | 5714-22-1 | -- | -- | 0.01 ppm | -- |
| Sulfur tetrafluoride | 7783-60-0 | -- | -- | 0.1 ppm | -- |
| Sulfuryl fluoride | 2699-79-8 | 5 ppm | 10 ppm | -- | -- |
| Sulprofos | 35400-43-2 | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Systox (Demeton) | 8065-48-3 | 0.01 ppm | 0.03 ppm | -- | X |
| 2, 4, 5-T (2, 4, 5- tri-chlorophenoxyacetic acid) | 93-76-5 | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Talc (containing asbestos) (as asbestos) (see WAC 296-62-07705 and chapter 296-65 WAC) | -- | 0.1 f/cc | 1.0 f/cc (30 minutes) | -- | -- |
| Talc (containing no asbestos) | -- | -- | -- | -- | -- |
| Respirable fraction | 14807-96-6 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Tantalum | -- | -- | -- | -- | -- |
| Metal and oxide dusts | 7440-25-7 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| TDI (Toluene-2, 4-diisocyanate) | 584-84-9 | 0.005 ppm | 0.02 ppm | -- | -- |
| TEDP (Sulfotep) | 3689-24-5 | 0.2 mg/m3 | 0.6 mg/m3 | -- | X |
| Tellurium and compounds (as Te) | 13494-80-9 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Tellurium hexafluoride (as Te) | 7783-80-4 | 0.02 ppm | 0.06 ppm | -- | -- |
| Temephos (Abate) | 3383-96-8 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| TEPP | 107-49-3 | 0.004 ppm | 0.012 ppm | -- | X |
| Terphenyls | 26140-60-3 | -- | -- | 0.5 ppm | -- |
| 1, 1, 1, 2-Tetrachloro-2, 2-difluoroethane | 76-11-0 | 500 ppm | 625 ppm | -- | -- |
| 1, 1, 2, 2-Tetrachloro-1, 2-difluoroethane | 76-12-0 | 500 ppm | 625 ppm | -- | -- |
| 1, 1, 2, 2-Tetrachloroethane | 79-34-5 | 1 ppm | 3 ppm | -- | X |
| Tetrachloroethylene (Perchloroethylene) | 127-18-4 | 25 ppm | 38 ppm | -- | -- |
| Tetrachloromethane (Carbon tetrachloride) | 56-23-5 | 2 ppm | 4 ppm | -- | X |
| Tetrachloronaphthalene | 1335-88-2 | 2 mg/m3 | 4 mg/m3 | -- | X |
| Tetraethyl lead (as Pb) | 78-00-2 | 0.075 mg/m3 | 0.225 mg/m3 | -- | X |
| Tetrahydrofuran | 109-99-9 | 200 ppm | 250 ppm | -- | -- |
| Tetramethyl lead (as Pb) | 75-74-1 | 0.075 mg/m3 | 0.225 mg/m3 | -- | X |
| Tetramethyl succinonitrile | 3333-52-6 | 0.5 ppm | 1.5 ppm | -- | X |
| Tetranitromethane | 509-14-8 | 1 ppm | 3 ppm | -- | -- |
| Tetrasodium pyrophosphate | 7722-88-5 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Tetryl (2, 4, 6-trinitrophenyl-methylnitramine) | 479-45-8 | 1.5 mg/m3 | 3 mg/m3 | -- | X |
| Thallium (soluble compounds) (as Tl) | 7440-28-0 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| 4, 4-Thiobis (6-tert-butyl-m-cresol) | 96-69-5 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Thiodan (Endosulfan) | 115-29-7 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Thioglycolic acid | 68-11-1 | 1 ppm | 3 ppm | --- | X |
| Thionyl chloride | 7719-09-7 | -- | -- | 1 ppm | -- |
| Thiram (see WAC 296-62-07519) | 137-26-8 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Tin (as Sn) | -- | -- | -- | -- | -- |
| Inorganic compounds | 7440-31-5 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Tin (as Sn) | -- | -- | -- | -- | -- |
| Organic compounds | 7440-31-5 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Tin oxide (as Sn) | 21651-19-4 | 2 mg/m3 | 4 mg/m3 | -- | -- |
| Titanium dioxide | 13463-67-7 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| TNT (2, 4, 6-Trinitrotoluene) | 118-96-7 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| To lu e ne | 108-88-3 | 100 ppm | 150 ppm | -- | -- |
| Toluene-2, 4-diisocyanate (TDI) | 584-84-9 | 0.005 ppm | 0.02 ppm | --- | -- |
| m-Toluidine | 108-44-1 | 2 ppm | 4 ppm | -- | X |
| o-Toluidine | 95-53-4 | 2 ppm | 4 ppm | -- | X |
| p-Toluidine | 106-49-0 | 2.0 ppm | 4 ppm | -- | X |
| Toxaphene (Chlorinated camphene) | 8001-35-2 | 0.5 mg/m3 | 1 mg/m3 | -- | X |
| Tremolite (asbestiform) (as asbestos) (see WAC 296-62-07705 and chapter 296-65 WAC) | -- | 0.1 f/cc | 1.0 f/cc (30 minutes) | -- | -- |
| Tributyl phosphate | 126-73-8 | 0.2 ppm | 0.6 ppm | -- | -- |
| Trichloroacetic acid | 76-03-9 | 1 ppm | 3 ppm | -- | -- |
| 1, 2, 4-Trichlorobenzene | 120-82-1 | -- | -- | 5 ppm | -- |
| 1, 1, 1-Trichloroethane (Methyl chloroform) | 71-55-6 | 350 ppm | 450 ppm | -- | -- |
| 1, 1, 2-Trichloroethane | 79-00-5 | 10 ppm | 20 ppm | -- | -- |
| Trichloroethylene | 79-01-6 | 50 ppm | 200 ppm | -- | -- |
| Trichlorofluoromethane (Fluorotrichloromethane) | 75-69-4 | -- | -- | 1,000 ppm | -- |
| Trichloromethane (Chloroform) | 67-66-3 | 2 ppm | 4 ppm | -- | -- |
| Trichloronaphthalene | 1321-65-9 | 5 mg/m3 | 10 mg/m3 | -- | X |
| 1, 2, 3-Trichloropropane | 96-18-4 | 10 ppm | 20 ppm | -- | X |
| 1, 1, 2-Trichloro-1, 2,2-trifluoroethane | 76-13-1 | 1,000 ppm | 1,250 ppm | -- | -- |
| Tricyclohexyltin hydroxide (Cyhexatin) | 13121-70-5 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Triethylamine | 121-44-8 | 10 ppm | 15 ppm | -- | -- |
| Trifluorobromomethane | 75-63-8 | 1,000 ppm | 1,250 ppm | -- | -- |
| Trimellitic anhydride | 552-30-7 | 0.005 ppm | 0.015 ppm | -- | -- |
| Trimethylamine | 75-50-3 | 10 ppm | 15 ppm | -- | -- |
| Trimethyl benzene | 25551-13-7 | 25 ppm | 38 ppm | -- | -- |
| Trimethyl phosphite | 121-45-9 | 2 ppm | 4 ppm | -- | -- |
| 2, 4, 6-Trinitrophenol (Picric acid) | 88-89-1 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| 2, 4, 6-Trinitrophenyl-methylnitramine (Tetryl) | 479-45-8 | 1.5 mg/m3 | 3 mg/m3 | --- | X |
| 2, 4, 6-Trinitrotoluene (TNT) | 118-96-7 | 0.5 mg/m3 | 1.5 mg/m3 | -- | X |
| Triorthocresyl phosphate | 78-30-8 | 0.1 mg/m3 | 0.3 mg/m3 | -- | X |
| Triphenyl amine | 603-34-9 | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Triphenyl phosphate | 115-86-6 | 3 mg/m3 | 6 mg/m3 | -- | -- |
| Tungsten (as W) | 7440-33-7 | -- | -- | -- | -- |
| Soluble compounds | -- | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Insoluble compounds | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Turpentine | 8006-64-2 | 100 ppm | 150 ppm | -- | -- |
| Uranium (as U) | 7440-61-1 | -- | -- | -- | -- |
| Soluble compounds | -- | 0.05 mg/m3 | 0.15 mg/m3 | -- | -- |
| Insoluble compounds | -- | 0.2 mg/m3 | 0.6 mg/m3 | -- | -- |
| n-Valeraldehyde | 110-62-3 | 50 ppm | 75 ppm | -- | -- |
| Vanadium (as V2O5) | -- | -- | -- | -- | -- |
| Respirable fraction | 1314-62-1 | 0.05 mg/m3 | 0.15 mg/m3 | -- | -- |
| Vegetable oil mist | -- | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Vinyl acetate | 108-05-1 | 10 ppm | 20 ppm | -- | -- |
| Vinyl benzene (Styrene) | 100-42-5 | 50 ppm | 100 ppm | -- | -- |
| Vinyl bromide | 593-60-2 | 5 ppm | 10 ppm | -- | -- |
| Vinyl chloride (Chloroethylene) (see WAC 296-62-07329) | 75-01-4 | 1 ppm | 5 ppm | -- | -- |
| Vinyl cyanide (Acrylonitrile) (see WAC 296-62-07336) | 107-13-1 | 2 ppm | 10 ppm | -- | -- |
| Vinyl cyclohexene dioxide | 106-87-6 | 10 ppm | 20 ppm | -- | X |
| Vinyl toluene | 25013-15-4 | 50 ppm | 75 ppm | -- | -- |
| Vinylidene chloride (1, 1-Dichloroethylene) | 75-35-4 | 1 ppm | 3 ppm | -- | -- |
| VM & P Naphtha | 8032-32-4 | 300 ppm | 400 ppm | -- | -- |
| Warfarin | 81-81-2 | 0.1 mg/m3 | 0.3 mg/m3 | -- | -- |
| Welding fumes (total particulate) | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Wood dust | -- | -- | -- | -- | -- |
| Nonallergenic; (All woods except allergenics) | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Allergenics (e.g. cedar, mahogany and teak) | -- | 2.5 mg/m3 | 5 mg/m3 | -- | -- |
| Xylenes (ortho, meta, and para isomers) (Dimethylbenzene) | 1330-20-7 | 100 ppm | 150 ppm | -- | -- |
| m-Xylene alpha, alpha-diamine | 1477-55-0 | -- | -- | 0.1 mg/m3 | X |
| Xylidine (Dimethylaminobenzene) | 1300-73-8 | 2 ppm | 4 ppm | -- | X |
| Yttrium | 7440-65-5 | 1 mg/m3 | 3 mg/m3 | -- | -- |
| Zinc chloride fume | 7646-85-7 | 1 mg/m3 | 2 mg/m3 | -- | -- |
| Zinc chromate (as Cr) (see WAC 296-62-08003) | Varies with compound | 0.005 mg/m3 | -- | 0.1 mg/m3 | -- |
| Zinc oxide | 1314-13-2 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m | -- | -- |
| Zinc oxide fume | 1314-13-2 | 5 mg/g3 | 10 mg/m3 | -- | -- |
| Zinc stearate | 557-05-1 | -- | -- | -- | -- |
| Total particulate | -- | 10 mg/m3 | 20 mg/m3 | -- | -- |
| Respirable fraction | -- | 5 mg/m3 | 10 mg/m3 | -- | -- |
| Zirconium compounds (as Zr) | 7440-67-2 | 5 mg/m3 | 10 mg/m3 | -- | -- |
Wash. Admin. Code § 296-841-20025
Reviser's note: The spelling errors in the above section occurred in the copy filed by the agency and appear in the Register pursuant to the requirements of RCW 34.08.040.
The typographical error in the above section occurred in the copy filed by the agency and appears in the Register pursuant to the requirements of RCW 34.08.040.