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

     IMPORTANT:

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

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

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

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

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

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

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

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

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

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

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

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


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

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

     (see WAC 296-62-077 and

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

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

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

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

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

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

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

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

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

     (see WAC 296-62-077 and

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

     asbestos)

     (see WAC 296-62-077 and

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

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

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

     compounds (as As) (when

     use is covered by chapter

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

     compounds (as As)

     (when use is not

     covered by chapter

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

     (see WAC 296-62-077

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

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

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

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

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

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

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

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

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

     (1,3-butadiene)

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

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

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

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

     (as Cr)

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

     (see WAC 296-62-074

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

     (see WAC 296-62-074

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

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

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

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

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

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

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

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

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

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

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

     (42% Chlorine) (PCB)

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

     (54% Chlorine)

     (Polychlorobiphenyls

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

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

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

     (vinyl chloride)

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

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

     (Methyl chloromethyl

     ether)

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

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

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

     (as Cr)

     (when the compound is not

     covered by WAC

     296-62-08003)		 Varies with

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

     (as Cr) (when the compound

     is covered by

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

     or Chromium (II) compounds

     Or

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

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

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

     (see WAC 296-62-077

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

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

     (benzene soluble fraction)

     Acridine

     Anthracene

     Benzo (a) pyrene

     Chrysene

     Phenanthrene

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

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

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

     4-dichloro-phenoxyethyl

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

     (see WAC 296-62-077 and

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

     		123-73-9;

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

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

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

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

     chloropropane)

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

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

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

     (4-hydroxy-4-methyl-

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

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

     (DBCP)

     (see WAC

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

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

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

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

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

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

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

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

     (Methylene chloride)

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

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

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

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

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

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

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

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

     2-dichloroethyl phosphate

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

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

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

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

99-65-0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

     (see WAC 296-62-07521

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

     (see WAC 296-62-07521,

     296-155-176, and chapter

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

     (see WAC 296-62-08003,

     296-62-07521, and

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

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

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

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

     (4, 4'-Methylene bis

     (2-chloro-aniline))

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

     (4, 4-Methylene dianiline)

     (see WAC 296-62-076

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

     (Methylene bisphenyl

     isocyanate)

     (Diphenylmethane

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

     (Methyl ethyl ketone)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

     (chloromethyl methyl

     ether)

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

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

     (MDI)

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

     (2-chloro-aniline) (MBOCA)

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

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

     (Dichloromethane)

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

     (see WAC 296-62-076

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

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

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

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

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

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

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

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

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

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

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

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

     (see WAC 296-62-073)		 91-59-8 ---- ---- ----