Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-307 - Safety standards for agriculture › SPECIALIZED OPERATIONS › Part Y-6 - Respiratory Hazards › Section 296-307-62625 - Permissible exposure limits of air contaminants

Current through Register Vol. 24-14, July 15, 2024
IMPORTANT:
The following information applies to Table 3, Permissible
					 Exposure Limits for Air Contaminants.
1. Exposure needs to be determined from
				  personal air samples taken in the breathing zone or from monitoring
				  representative of the employee's breathing zone.
2. Ppm refers to parts of vapor or gas per
				  million parts of air by volume, at 25 degrees C and 760 mm Hg
				  pressure.
3.
				  Mg/m3 refers to milligrams of substance per cubic
				  meter of air.
4. For a metal that
				  is measured as the metal itself, only the CAS number for the metal is given.
				  The CAS numbers for individual compounds of the metal are not provided. For
				  more information about CAS registry numbers see the website:
https://www.cas.org
.
5. Time weighted averages
				  (TWA8) represent the maximum allowed average exposure
				  for any 8-hour time period. For work periods longer than 8 hours the
				  TWA8 needs to be determined using the 8 continuous hours
				  with the highest average concentration.
6. Short-term exposure limits (STEL)
				  represent maximum allowed average exposure for any fifteen-minute period,
				  unless another time period is noted in Table 3.
7. The ceiling represents the maximum allowed
				  exposure for the shortest time period that can feasibly be measured.
8. An "X" in the "skin" column indicates the
				  substance can be absorbed through the skin, either by airborne or direct
				  contact.
9. Requirements for the
				  use of gloves, coveralls, goggles, and other personal protective equipment can
				  be found in WAC
				  296-307-100.
10. The respirable fraction of particulate is
				  measured by sampling with a size-selector having the following characteristics:
Mean aerodynamic diameter in
								micrometers
Percent passing the
								selector
1
97
2
91
3
74
4
50
5
30
6
17
7
9
8
5
10
1
Table 3 "Permissible Exposure Limits for Air
					 Contaminants"
Substance
CAS
TWA8
STEL
Ceiling
Skin
Abate (Temephos)
3383-96-8
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Acetaldehyde
75-07-0
100 ppm
150 ppm
-
-
Acetic acid
64-19-7
10 ppm
20 ppm
-
-
Acetic anhydride
108-24-7
-
-
5 ppm
-
Acetone
67-64-1
750 ppm
1,000 ppm
-
-
Acetonitrile
75-05-8
40 ppm
60 ppm
-
-
2-Acetylaminofluorene
53-96-3
-
-
-
-
Acetylene
74-86-2
Simple asphyxiant
-
-
-
Acetylene dichloride (1,2-Dichloroethylene)
540-59-0
200 ppm
250 ppm
-
-
Acetylene tetrabromide
79-27-6
1 ppm
3 ppm
-
-
Acetylsalicylic acid (Aspirin)
50-78-2
5 mg/m3
10 mg/m3
-
-
Acrolein
107-02-8
0.1 ppm
0.3 ppm
-
-
Acrylamide
79-06-1
0.03 mg/m3
0.09 mg/m3
-
X
Acrylic acid
79-10-7
10 ppm
20 ppm
-
X
Acrylonitrile (Vinyl cyanide)
107-13-1
2 ppm
10 ppm
-
-
Aldrin
309-00-2
0.25 mg/m3
0.75 mg/m3
-
X
Allyl alcohol
107-18-6
2 ppm
4 ppm
-
X
Allyl chloride
107-05-1
1 ppm
2 ppm
-
-
Allyl glycidyl ether (AGE)
106-92-3
5 ppm
10 ppm
-
-
Allyl propyl disulfide
2179-59-1
2 ppm
3 ppm
-
-
alpha-Alumina (Aluminum oxide)
1344-28-1
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Aluminum (as Al)
7429-90-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Pyro powders
-
5 mg/m3
10 mg/m3
-
-
Welding fumes
-
5 mg/m3
10 mg/m3
-
-
Soluble salts
-
2 mg/m3
4 mg/m3
-
-
Alkyls (NOC)
-
2 mg/m3
4 mg/m3
-
-
Aluminum oxide (Alundum, Corundum)
7429-90-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
4-Aminodiphenyl
92-67-1
-
-
-
-
2-Aminoethanol (Ethanolamine)
141-43-5
3 ppm
6 ppm
-
-
2-Aminopyridine
504-29-0
0.5 ppm
1. 5 ppm
-
-
Amitrole
61-82-5
0.2 mg/m3
0.6 mg/m3
-
-
Ammonia
7664-41-7
25 ppm
35 ppm
-
-
Ammonium chloride, fume
12125-02-9
10 mg/m3
20 mg/m3
-
-
Ammonium sulfamate (Ammate)
7773-06-0
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5.0 mg/m3
10 mg/m3
-
-
n-Amyl acetate
628-63-7
100 ppm
150 ppm
-
-
sec-Amyl acetate
626-38-0
125 ppm
156 ppm
-
-
Aniline and homologues
62-53-3
2 ppm
4 ppm
-
X
Anisidine (o, p-isomers)
29191-52-4
0.1 ppm
0.3 ppm
-
X
Antimony and compounds (as Sb)
7440-36-0
0.5 mg/m3
1. 5 mg/m3
-
-
ANTU (alpha Naphthyl thiourea)
86-88-4
0.3 mg/m3
0.9 mg/m3
-
-
Argon
7440-37-1
Simple asphyxiant
-
-
-
Arsenic, organic compounds (as As)
7440-38-2
0.2 mg/m3
0.6 mg/m3
-
-
Arsenic, inorganic compounds (as As) (when use is
							 covered by WAC 296-62-07347)
7440-38-2
0.01 mg/m3
-
-
-
Arsenic, inorganic compounds (as As) (when use is not
							 covered by WAC 296-62-07347)
7440-38-2
0.2 mg/m3
0.6 mg/m3
-
-
Arsine
7784-42-1
0.05 ppm
0.15 ppm
-
-
Asbestos
-
-
-
-
-
Asphalt (Petroleum fumes)
8052-42-4
5 mg/m3
10 mg/m3
-
-
Atrazine
1912-24-9
5 mg/m3
10 mg/m3
-
-
Azinphos methyl (Guthion)
86-50-0
0.2 mg/m3
0.6 mg/m3
-
X
Azodrin (Monocrotophos)
6923-22-4
0.25 mg/m3
0.75 mg/m3
-
-
Barium, soluble compounds (as Ba)
7440-39-3
0.5 mg/m3
1. 5 mg/m3
-
-
Barium sulfate
7727-43-7
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Baygon (Propoxur)
114-26-1
0.5 mg/m3
1. 5 mg/m3
-
-
Benomyl
17804-35-2
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Benzene
71-43-2
1 ppm
5 ppm
-
-
Benzidine
92-87-5
-
-
-
-
p-Benzoquinone (Quinone)
106-51-4
0.1 ppm
0.3 ppm
-
-
Benzo(a) pyrene (Coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
-
-
Benzoyl peroxide
94-36-0
5 mg/m3
10 mg/m3
-
-
Benzyl chloride
100-44-7
1ppm
3 ppm
-
-
Beryllium and beryllium compounds (as Be) (see chapter
							 296-850 WAC)
7440-41-7
0.0002 mg/m3
0.002 mg/m3
-
-
Biphenyl (Diphenyl)
92-52-4
0.2 ppm
0.6 ppm
-
-
Bismuth telluride, undoped
1304-82-1
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Bismuth telluride, Se-doped
-
5 mg/m3
10 mg/m3
-
-
Borates, tetra, sodium salts
-
-
-
-
-
Anhydrous
1330-43-4
1 mg/m3
3 mg/m3
-
-
Decahydrate
1303-96-4
5 mg/m3
10 mg/m3
-
-
Pentahydrate
12179-04-3
1 mg/m3
3 mg/m3
-
-
Boron oxide
1303-86-2
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Boron tribromide
10294-33-4
-
-
1 ppm
-
Boron trifluoride
6737-07-2
-
-
1 ppm
-
Bromacil
314-40-9
1 ppm
3 ppm
-
-
Bromine
7726-95-6
0.1 ppm
0.3 ppm
-
-
Bromine pentafluoride
7789-30-2
0.1 ppm
0.3 ppm
-
-
Bromochloromethane (Chlorobromomethane)
74-97-5
200 ppm
250 ppm
-
-
Bromoform
15-25-2
0.5 ppm
1. 5 ppm
-
X
Butadiene (1,3-butadiene)
106-99-0
1 ppm
5 ppm
-
-
Butane
106-97-8
800 ppm
1,000 ppm
-
-
Butanethiol (Butyl mercaptan)
109-79-5
0.5 ppm
1. 5 ppm
-
-
2-Butanone (Methyl ethyl ketone)
78-93-3
200 ppm
300 ppm
-
-
2-Butoxy ethanol (Butyl cellosolve)
111-76-2
25 ppm
38 ppm
-
X
n-Butyl acetate
123-86-4
150 ppm
200 ppm
-
-
sec-Butyl acetate
105-46-4
200 ppm
250 ppm
-
-
tert-Butyl acetate
540-88-5
200 ppm
250 ppm
-
-
Butyl acrylate
141-32-2
10 ppm
20 ppm
-
-
n-Butyl alcohol
71-36-3
-
-
50 ppm
X
sec-Butyl alcohol
78-92-2
100 ppm
150 ppm
-
-
tert-Butyl alcohol
75-65-0
100 ppm
150 ppm
-
-
Butylamine
109-73-9
-
-
5 ppm
X
Butyl cellosolve (2-Butoxy ethanol)
111-76-2
25 ppm
38 ppm
-
-
tert-Butyl chromate (as CrOs)
1189-85-1
-
-
0.1 mg/m3
X
n-Butyl glycidyl ether (BGE)
2426-08-6
25 ppm
38 ppm
-
-
n-Butyl lactate
138-22-7
5 ppm
10 ppm
-
-
Butyl mercaptan
109-79-5
0.5 ppm
1. 5 ppm
-
-
o-sec-Butylphenol
89-72-5
5 ppm
10 ppm
-
X
p-tert-Butyl-toluene
98-51-1
10 ppm
20 ppm
-
-
Cadmium oxide fume (as Cd)
1306-19-0
0.005 mg/m3
-
-
-
Cadmium dust and salts (as Cd)
7440-43-9
0.005 mg/m3
-
-
-
Calcium arsenate
-
0.01 mg/m3
-
-
-
Calcium carbonate
1317-65-3
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Calcium cyanamide
156-62-7
0.5 mg/m3
1. 5 mg/m3
-
-
Calcium hydroxide
1305-62-0
5 mg/m3
10 mg/m3
-
-
Calcium oxide
1305-78-8
2 mg/m3
4 mg/m3
-
-
Calcium silicate
1344-95-2
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Calcium sulfate
7778-18-9
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Camphor (synthetic)
76-22-2
2 mg/m3
4 mg/m3
-
-
Caprolactam
105-60-2
-
-
-
-
Dust
-
1 mg/m3
3 mg/m3
-
-
Vapor
-
5 ppm
10 ppm
-
-
Captafol (Difolatan)
2425-06-1
0.1 mg/m3
0.3 mg/m3
-
X
Captan
133-06-2
5 mg/m3
10 mg/m3
-
-
Carbaryl (Sevin)
63-25-2
5 mg/m3
10 mg/m3
-
-
Carbofuran (Furadon)
1563-66-2
0.1 mg/m3
0.3 mg/m3
-
-
Carbon black
1333-86-4
3.5 mg/m3
7 mg/m3
-
-
Carbon dioxide
124-38-9
5,000 ppm
30,000 ppm
-
-
Carbon disulfide
75-15-0
4 ppm
12 ppm
-
X
Carbon monoxide
630-08-0
35 ppm
200 ppm (5 min.)
1,500 ppm
-
Carbon tetrabromide
558-13-4
0.1 ppm
0.3 ppm
-
-
Carbon tetrachloride (Tetrachloromethane)
56-23-5
2 ppm
4 ppm
-
X
Carbonyl chloride (Phosgene)
7803-51-2
0.1 ppm
0.3 ppm
-
-
Carbonyl fluoride
353-50-4
2 ppm
5 ppm
-
-
Catechol (Pyrocatechol)
120-80-9
5 ppm
10 ppm
-
X
Cellosolve acetate (2-Ethoxyethylacetate)
111-15-9
5 ppm
10 ppm
-
X
Cellulose (paper fiber)
9004-34-6
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Cesium hydroxide
21351-79-1
2 mg/m3
4 mg/m3
-
-
Chlordane
57-74-9
0.5 mg/m3
1. 5 mg/m3
-
X
Chlorinated camphene (Toxaphen)
8001-35-2
0.5 mg/m3
1 mg/m3
-
X
Chlorinated diphenyl oxide
55720-99-5
0.5 mg/m3
1. 5 mg/m3
-
-
Chlorine
7782-50-5
0.5 ppm
-
1 ppm
-
Chlorine dioxide
10049-04-4
0.1 ppm
0.3 ppm
-
-
Chlorine trifluoride
7790-91-2
-
-
0.1 ppm
-
Chloroacetaldehyde
107-20-0
-
-
1 ppm
-
a-Chloroacetophenone (Phenacyl chloride)
532-21-4
0.05 ppm
0.15 ppm
-
-
Chloroacetyl chloride
79-04-9
0.05 ppm
0.15 ppm
-
-
Chlorobenzene (Monochlorobenzene)
108-90-7
75 ppm
113 ppm
-
-
o-Chlorobenzylidene malononitrile (OCBM)
2698-41-1
-
-
0.05 ppm
X
Chlorobromomethane
74-97-5
200 ppm
250 ppm
-
-
2-Chloro-1, 3-butadiene (beta-Chloroprene)
126-99-8
10 ppm
20 ppm
-
X
Chlorodifluoromethane
75-45-6
1,000 ppm
1,250 ppm
-
-
Chlorodiphenyl (42% Chlorine) (PCB)
							 (Polychlorobiphenyls)
53469-21-9
1 mg/m3
3 mg/m3
-
X
Chlorodiphenyl (54% Chlorine) (Polychlorobiphenyls
							 (PCB))
11097-69-1
0.5 mg/m3
1. 5 mg/m3
-
X
1-Chloro-2, 3-epoxypropane (Epichlorhydrin)
106-89-8
2 ppm
4 ppm
-
X
2-Chloroethanol (Ethylene chlorohydrin)
107-07-3
-
-
1 ppm
X
Chloroethylene (vinyl chloride)
75-01-4
1 ppm
5 ppm
-
-
Chloroform (Trichloromethane)
67-66-3
2 ppm
4 ppm
-
-
1-Chloro-1-nitropropane
600-25-9
2 ppm
4 ppm
-
-
bis-Chloromethyl ether
542-88-1
-
-
-
-
Chloromethyl methyl ether (Methyl chloromethyl
							 ether)
107-30-2
-
-
-
-
Chloropentafluoroethane
76-15-3
1,000 ppm
1,250 ppm
-
-
Chloropicrin (Nitrotrichloromethane)
76-06-2
0.1 ppm
0.3 ppm
-
-
beta-Chloroprene (2-Chloro-1, 3-butadiene)
126-99-8
10 ppm
20 ppm
-
X
o-Chlorostyrene
2039-87-4
50 ppm
75 ppm
-
-
2-Chloro-6-trichloromethyl pyridine (Nitrapyrin)
1929-82-4
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Chlorpyrifos
2921-88-2
0.2 mg/m3
0.6 mg/m3
-
X
Chromic acid and chromates (as CrO3)
Varies with compound
0.1 mg/m3
0.3 mg/m3
-
-
Chromium, soluble, chromic and chromous salts (as
							 Cr)
7440-47-3
0.5 mg/m3
1. 5 mg/m3
-
-
Chromium (VI) compounds (as Cr)
-
0.05 mg/m3
0.15 mg/m3
-
-
Chromium metal and insoluble salts
7440-47-3
0.5 mg/m3
1. 5 mg/m3
-
-
Chromyl chloride
14977-61-8
0.025 ppm
0.075 ppm
-
-
Chrysene (Coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
-
-
Clopidol
2971-90-6
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Coal dust (less than 5% SiO2)
-
-
-
-
-
Respirable fraction
-
2 mg/m3
4 mg/m3
-
-
Coal dust (greater than or equal to 5% SiO2)
-
-
-
-
-
Respirable fraction
-
0.1 mg/m3
0.3 mg/m3
-
-
Coal tar pitch volatiles (benzene soluble fraction)
							 (Particulate polycyclic aromatic hydrocarbons)
65996-93-2
0.2 mg/m3
0.6 mg/m3
-
-
Cobalt, metal fume & dust (as Co)
7440-48-4
0.05 mg/m3
0.15 mg/m3
-
-
Cobalt carbonyl (as Co)
10210-68-1
0.1 mg/m3
0.3 mg/m3
-
-
Cobalt hydrocarbonyl (as Co)
16842-03-8
0.1 mg/m3
0.3 mg/m3
-
-
Coke oven emissions
-
0.15 mg/m3
-
-
-
Copper (as Cu)
7440-50-8
-
-
-
-
Fume
-
0.1 mg/m3
0.3 mg/m3
-
-
Dusts and mists
-
1 mg/m3
3 mg/m3
-
-
Cotton dust (raw) (waste sorting, blending, cleaning,
							 willowing and garetting)
-
1 mg/m3
-
-
-
Corundum (Aluminum oxide)
7429-90-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Crag herbicide (Sesone, Sodium-2,
							 4-dichloro-phenoxyethyl sulfate)
136-78-7
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Cresol (all isomers)
1319-77-3
5 ppm
10 ppm
-
X
Crotonaldehyde
123-73-9; 4170-30-3
2 ppm
4 ppm
-
-
Crufomate
299-86-5
5 mg/m3
10 mg/m3
-
-
Cumene
98-82-8
50 ppm
75 ppm
-
X
Cyanamide
420-04-2
2 mg/m3
4 mg/m3
-
-
Cyanide (as CN)
Varies with compound
5 mg/m3
10 mg/m3
-
X
Cyanogen
460-19-5
10 ppm
20 ppm
-
-
Cyanogen chloride
506-77-4
-
-
0.3 ppm
-
Cyclohexane
110-82-7
300 ppm
375 ppm
-
-
Cyclohexanol
108-93-0
50 ppm
75 ppm
-
X
Cyclohexanone
108-94-1
25 ppm
38 ppm
-
X
Cyclohexene
110-83-8
300 ppm
375 ppm
-
-
Cyclohexylamine
108-91-8
10 ppm
20 ppm
-
-
Cyclonite (RDX)
121-82-4
1. 5 mg/m3
3.0 mg/m3
-
X
Cyclopentadiene
542-92-7
75 ppm
113 ppm
-
-
Cyclopentane
287-92-3
600 ppm
750 ppm
-
-
Cyhexatin (Tricyclohexyltin hydroxide)
13121-70-5
5 mg/m3
10 mg/m3
-
-
2,4-D (Dichlorophenoxy-acetic acid)
94-75-7
10 mg/m3
20 mg/m3
-
-
DBCP (1,2-Dibromo-3-chloropropane)
96-12-8
0.001 ppm
-
0.005 ppm
-
DDT (Dichlorodiphenyltri-chloroethane)
50-29-3
1 mg/m3
3 mg/m3
-
X
DDVP, (Dichlorvos)
62-73-7
0.1 ppm
0.3 ppm
-
X
Dasanit (Fensulfothion)
115-90-2
0.1 mg/m3
0.3 mg/m3
-
-
Decaborane
17702-41-9
0.05 ppm
0.15 ppm
-
X
Demeton
8065-48-3
0.01 ppm
0.03 ppm
-
X
Diacetone alcohol (4-hydroxy-4-methyl-
2-pentanone)
123-42-2
50 ppm
75 ppm
-
-
1, 2-Diaminoethane (Ethylenediamine)
107-15-3
10 ppm
20 ppm
-
-
Diazinon
333-41-5
0.1 mg/m3
0.3 mg/m3
-
X
Diazomethane
334-88-3
0.2 ppm
0.6 ppm
-
-
Diborane
19287-45-7
0.1 ppm
0.3 ppm
-
-
Dibrom (see Naled)
300-76-5
3 mg/m3
6 mg/m3
-
X
1, 2-Dibromo-3-chloropropane (DBCP)
96-12-8
0.001 ppm
-
0.005 ppm
-
2-N-Dibutylamino ethanol
102-81-8
2 ppm
4 ppm
-
X
Dibutyl phosphate
107-66-4
1 ppm
2 ppm
-
-
Dibutyl phthalate
84-74-2
5 mg/m3
10 mg/m3
-
-
Dichloroacetylene
7572-29-4
-
-
0.1 ppm
-
o-Dichlorobenzene
95-50-1
-
-
50 ppm
-
p-Dichlorobenzene
106-46-7
75 ppm
110 ppm
-
-
3, 3'-Dichlorobenzidine
91-94-1
-
-
-
-
Dichlorodiphenyltri-chloroethane (DDT)
50-29-3
1 mg/m3
3 mg/m3
-
X
Dichlorodifluoromethane
75-71-8
1,000 ppm
1,250 ppm
-
-
1, 3-Dichloro-5, 5-dimethyl hydantoin
118-52-5
0.2 mg/m3
0.4 mg/m3
-
-
1, 1-Dichloroethane (Ethylidine chloride)
75-34-3
100 ppm
150 ppm
-
-
1, 2-Dichloroethane (Ethylene dichloride)
107-06-2
1 ppm
2 ppm
-
-
1, 1-Dichloroethylene (Vinylidene chloride)
75-35-4
1 ppm
3 ppm
-
-
1, 2-Dichloroethylene (Acetylene dichloride)
540-59-0
200 ppm
250 ppm
-
-
Dichloroethyl ether
111-44-4
5 ppm
10 ppm
-
X
Dichlorofluoromethane
75-43-4
10 ppm
20 ppm
-
-
Dichloromethane (Methylene chloride)
75-09-2
25 ppm
125 ppm
-
-
1, 1-Dichloro-1-nitroethane
594-72-9
2 ppm
10 ppm
-
-
Dichlorophenoxyacetic acid (2, 4-D)
94-75-7
10 mg/m3
20 mg/m3
-
-
1, 2-Dichloropropane (Propylene dichloride)
78-87-5
75 ppm
110 ppm
-
-
Dichloropropene
542-75-6
1 ppm
3 ppm
-
X
2, 2-Dichloropropionic acid
75-99-0
1 ppm
3 ppm
-
-
Dichlorotetrafluoroethane
76-14-2
1,000 ppm
1,250 ppm
-
-
Dichlorvos (DDVP)
62-73-7
0.1 ppm
0.3 ppm
-
X
Dicrotophos
141-66-2
0.25 mg/m3
0.75 mg/m3
-
X
Dicyclopentadiene
77-73-6
5 ppm
10 ppm
-
-
Dicyclopentadienyl iron
102-54-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Dieldrin
60-57-1
0.25 mg/m3
0.75 mg/m3
-
X
Diethanolamine
111-42-2
3 ppm
6 ppm
-
-
Diethylamine
109-89-7
10 ppm
25 ppm
-
-
2-Diethylaminoethanol
100-37-8
10 ppm
20 ppm
-
X
Diethylene triamine
111-40-0
1 ppm
3 ppm
-
X
Diethyl ether (Ethyl ether)
60-29-7
400 ppm
500 ppm
-
-
Diethyl ketone
96-22-0
200 ppm
250 ppm
-
-
Diethyl phthalate
84-66-2
5 mg/m3
10 mg/m3
-
-
Difluorodibromomethane
75-61-6
100 ppm
150 ppm
-
-
Difolatan (Captafol)
2425-06-1
0.1 mg/m3
0.3 mg/m3
-
X
Diglycidyl ether (DGE)
2238-07-5
0.1 ppm
0.3 ppm
-
-
Dihydroxybenzene (Hydroquinone)
123-31-9
2 mg/m3
4 mg/m3
-
-
Diisobutyl ketone (2, 6-Dimethylheptanone)
108-83-8
25 ppm
38 ppm
-
-
Diisopropylamine
108-18-9
5 ppm
10 ppm
-
X
Dimethoxymethane (Methylal)
109-87-5
1,000 ppm
1,250 ppm
-
-
Dimethyl acetamide
127-19-5
10 ppm
20 ppm
-
X
Dimethylamine
124-40-3
10 ppm
20 ppm
-
-
4-Dimethylaminoazo benzene
60-11-7
-
-
-
-
Dimethylaminobenzene (Xylidene)
1300-73-8
2 ppm
4 ppm
-
X
Dimethylaniline (N, N-Dimethylaniline)
121-69-7
5 ppm
10 ppm
-
X
Dimethylbenzene (Xylene)
1300-73-8
100 ppm
150 ppm
-
-
Dimethyl-1, 2-dibromo-2, 2-dichloroethyl phosphate
							 (Naled)
300-76-5
3 mg/m3
6 mg/m3
-
X
Dimethylformamide
68-12-2
10 ppm
20 ppm
-
X
2, 6-Dimethylheptanone (Diisobutyl ketone)
108-83-8
25 ppm
38 ppm
-
-
1, 1-Dimethylhydrazine
57-14-7
0.5 ppm
1. 5 ppm
-
X
Dimethyl phthalate
131-11-3
5 mg/m3
10 mg/m3
-
-
Dimethyl sulfate
77-78-1
0.1 ppm
0.3 ppm
-
X
Dinitolmide (3, 5-Dinitro-o-toluamide)
148-01-6
5 mg/m3
10 mg/m3
-
-
Dinitrobenzene (all isomers - alpha, meta and
							 para)
528-29-0; 99-65-0; 100-25-4
0.15 ppm
0.45 ppm
-
X
Dinitro-o-cresol
534-52-1
0.2 mg/m3
0.6 mg/m3
-
X
3, 5-Dinitro-o-toluamide (Dinitolmide)
148-01-6
5 mg/m3
10 mg/m3
-
-
Dinitrotoluene
25321-14-6
1. 5 mg/m3
3 mg/m3
-
X
Dioxane (Diethylene dioxide)
123-91-1
25 ppm
38 ppm
-
X
Dioxathion
78-34-2
0.2 mg/m3
0.6 mg/m3
-
X
Diphenyl (Biphenyl)
92-52-4
0.2 ppm
0.6 ppm
-
-
Diphenylamine
122-39-4
10 mg/m3
20 mg/m3
-
-
Diphenylmethane diisocyanate (Methylene bisphenyl
							 isocyanate (MDI))
101-68-8
-
-
0.02 ppm
-
Dipropylene glycol methyl ether
34590-94-8
100 ppm
150 ppm
-
X
Dipropyl ketone
123-19-3
50 ppm
75 ppm
-
-
Diquat
85-00-7
0.5 mg/m3
1. 5 mg/m3
-
-
Di-sec, Octyl phthalate
							 (Di-2-ethylhexylphthal-ate)
117-81-7
5 mg/m3
10 mg/m3
-
-
Disulfram
97-77-8
2 mg/m3
4 mg/m3
-
-
Disulfoton
298-04-4
0.1 mg/m3
0.3 mg/m3
-
X
2, 6-Di-tert-butyl-p-cresol
128-37-0
10 mg/m3
20 mg/m3
-
-
Diuron
330-54-1
10 mg/m3
20 mg/m3
-
-
Divinyl benzene
1321-74-0
10 ppm
20 ppm
-
-
Emery
12415-34-8
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Endosulfan (Thiodan)
115-29-7
0.1 mg/m3
0.3 mg/m3
-
X
Endrin
72-20-8
0.1 mg/m3
0.3 mg/m3
-
X
Epichlorhydrin (1-Chloro-2, 3-epoxypropane)
106-89-8
2 ppm
4 ppm
-
X
EPN
2104-64-5
0.5 mg/m3
1. 5 mg/m3
-
X
1, 2-Epoxypropane (Propylene oxide)
75-56-9
20 ppm
30 ppm
-
-
2, 3-Epoxy-1-propanol (Glycidol)
556-52-5
25 ppm
38 ppm
-
-
Ethane
-
Simple asphyxiant
-
-
-
Ethanethiol (Ethyl mercaptan)
75-08-1
0.5 ppm
1. 5 ppm
-
-
Ethanol (Ethyl alcohol)
64-17-5
1,000 ppm
1,250 ppm
-
-
Ethanolamine (2-Aminoethanol)
141-43-5
3 ppm
6 ppm
-
-
Ethion
563-12-2
0.4 mg/m3
1. 2 mg/m3
-
X
2-Ethoxyethanol (Glycol monoethyl ether)
110-80-5
5 ppm
10 ppm
-
X
2-Ethoxyethyl acetate (Cellosolve acetate)
111-15-9
5 ppm
10 ppm
-
X
Ethyl acetate
141-78-6
400 ppm
500 ppm
-
-
Ethyl acrylate
140-88-5
5 ppm
25 ppm
-
X
Ethyl alcohol (ethanol)
64-17-5
1,000 ppm
1,250 ppm
-
-
Ethylamine
75-04-07
10 ppm
20 ppm
-
-
Ethyl amyl ketone (5-Methyl-3-hepatone)
541-85-5
25 ppm
38 ppm
-
-
Ethyl benzene
100-41-4
100 ppm
125 ppm
-
-
Ethyl bromide
74-96-4
200 ppm
250 ppm
-
-
Ethyl butyl ketone (3-Heptanone)
106-35-4
50 ppm
75 ppm
-
-
Ethyl chloride
75-00-3
1,000 ppm
1,250 ppm
-
-
Ethylene
74-85-1
Simple asphyxiant
-
-
-
Ethylene chlorohydrin (2-Chloroethanol)
107-07-3
-
-
1 ppm
X
Ethylenediamine (1,2-Diaminoethane)
107-15-3
10 ppm
20 ppm
-
X
Ethylene dibromide
106-93-4
0.1 ppm
0.5 ppm
-
-
Ethylene dichloride (1,2-Dichloroethane)
107-06-2
1 ppm
2 ppm
-
-
Ethylene glycol
107-21-1
-
-
50 ppm
-
Ethylene glycol dinitrate
628-96-6
-
0.1 mg/m3
-
X
Ethylene glycol monomethyl ether acetate (Methyl
							 cellosolve acetate)
-
5 ppm
10 ppm
-
X
Ethyleneimine
151-56-4
-
-
-
X
Ethylene oxide
75-21-8
1 ppm
5 ppm
-
-
Ethyl ether (Diethyl ether)
60-29-7
400 ppm
500 ppm
-
-
Ethyl formate
109-94-4
100 ppm
125 ppm
-
-
Ethylidine chloride (1, 1-Dichloroethane)
107-06-2
1 ppm
2 ppm
-
-
Ethylidene norbornene
16219-75-3
-
-
5.0 ppm
-
Ethyl mercaptan (Ethanethiol)
75-08-1
0.5 ppm
1. 5 ppm
-
-
n-Ethylmorpholine
100-74-3
5 ppm
10 ppm
-
X
Ethyl sec-amyl ketone (5-methyl-3-heptanone)
541-85-5
25 ppm
38 ppm
-
-
Ethyl silicate
78-10-4
10 ppm
20 ppm
-
-
Fenamiphos
22224-92-6
0.1 mg/m3
0.3 mg/m3
-
X
Fensulfothion (Dasanit)
115-90-2
0.1 mg/m3
0.3 mg/m3
-
-
Fenthion
55-38-9
0.2 mg/m3
0.6 mg/m3
-
X
Ferbam
-
-
-
-
-
Total particulate
14484-64-1
10 mg/m3
20 mg/m3
-
-
Ferrovanadium dust
12604-58-9
1 mg/m3
3 mg/m3
-
-
Fluorides (as F)
Varies with compound
2.5 mg/m3
5 mg/m3
-
-
Fluorine
7782-41-4
0.1 ppm
0.3 ppm
-
-
Fluorotrichloromethane (see Trichlorofluoro
							 methane)
75-69-4
-
-
1,000 ppm
-
Fonofos
944-22-9
0.1 mg/m3
0.3 mg/m3
-
X
Formaldehyde
50-00-0
0.75 ppm
2 ppm
-
-
Formamide
75-12-7
20 ppm
30 ppm
-
-
Formic acid
64-18-6
5 ppm
10 ppm
-
-
Furadon (carbofuran)
1563-66-2
0.1 mg/m3
0.3 mg/m3
-
-
Furfural
98-01-1
2 ppm
4 ppm
-
X
Furfuryl alcohol
98-00-0
10 ppm
15 ppm
-
X
Gasoline
8006-61-9
300 ppm
500 ppm
-
-
Germanium tetrahydride
7782-65-2
0.2 ppm
0.6 ppm
-
-
Glass, fibrous or dust
-
10 mg/m3
20 mg/m3
-
-
Gluteraldehyde
111-30-8
-
-
0.2 ppm
-
Glycerin mist
56-81-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Glycidol (2, 3-Epoxy-1-propanol)
556-52-5
25 ppm
38 ppm
-
-
Glycol monoethyl ether (2-Ethoxyethanol)
110-80-5
5 ppm
10 ppm
-
X
Grain dust (oat, wheat, barley)
-
10 mg/m3
20 mg/m3
-
-
Graphite, natural
7782-42-5
-
-
-
-
Respirable particulate
-
2.5 mg/m3
5 mg/m3
-
-
Graphite, synthetic
-
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Guthion (Azinphosmethyl)
86-50-0
0.2 mg/m3
0.6 mg/m3
-
X
Gypsum
13397-24-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Hafnium
7440-58-6
0.5 mg/m3
1. 5 mg/m3
-
-
Helium
-
Simple asphyxiant
-
-
-
Heptachlor
76-44-8
0.5 mg/m3
1. 5 mg/m3
-
X
Heptane (n-heptane)
142-82-5
400 ppm
500 ppm
-
-
2-Heptanone (Methyl n-amyl ketone)
110-43-0
50 ppm
75 ppm
-
-
3-Heptanone (Ethyl butyl ketone)
106-35-4
50 ppm
75 ppm
-
-
Hexachlorobutadiene
87-68-3
0.02 ppm
0.06 ppm
-
X
Hexachlorocyclopentadiene
77-47-4
0.01 ppm
0.03 ppm
-
-
Hexachloroethane
67-72-1
1 ppm
3 ppm
-
X
Hexachloronaphthalene
1335-87-1
0.2 mg/m3
0.6 mg/m3
-
X
Hexafluoroacetone
684-16-2
0.1 ppm
0.3 ppm
-
X
Hexane
-
-
-
-
-
n-hexane
110-54-3
50 ppm
75 ppm
-
-
other isomers
Varies with compound
500 ppm
1,000 ppm
-
-
2-Hexanone (Methyl-n-butyl ketone)
591-78-6
5 ppm
10 ppm
-
-
Hexone (Methyl isobutyl ketone)
108-10-1
50 ppm
75 ppm
-
-
sec-Hexyl acetate
108-84-9
50 ppm
75 ppm
-
-
Hexylene glycol
107-41-5
-
-
25 ppm
-
Hydrazine
302-01-2
0.1 ppm
0.3 ppm
-
X
Hydrogen
-
Simple asphyxiant
-
-
-
Hydrogenated terphenyls
61788-32-7
0.5 ppm
1. 5 ppm
-
-
Hydrogen bromide
10035-10-6
-
-
3.0 ppm
-
Hydrogen chloride
7647-01-0
-
-
5.0 ppm
-
Hydrogen cyanide
74-90-8
-
4.7 ppm
-
X
Hydrogen fluoride
7664-39-3
-
-
3 ppm
-
Hydrogen peroxide
7722-84-1
1 ppm
3 ppm
-
-
Hydrogen selenide (as Se)
7783-07-5
0.05 ppm
0.15 ppm
-
-
Hydrogen sulfide
7783-06-4
10 ppm
15 ppm
-
-
Hydroquinone (Dihydroxybenzene)
123-31-9
2 mg/m3
4 mg/m3
-
-
4-Hydroxy-4-methyl-2-pentanone
(Diacetone alcohol)
123-42-2
50 ppm
75 ppm
-
-
2-Hydroxypropyl acrylate
99-61-1
0.5 ppm
1. 5 ppm
-
X
Indene
95-13-6
10 ppm
20 ppm
-
-
Indium and compounds (as In)
7440-74-6
0.1 mg/m3
0.3 mg/m3
-
-
Iodine
7553-56-2
-
-
0.1 ppm
-
Iodoform
75-47-8
0.6 ppm
1. 8 ppm
-
-
Iron oxide dust and fume (as Fe)
1309-37-1
-
-
-
-
Total particulate
-
5 mg/m3
10 mg/m3
-
-
Iron pentacarbonyl (as Fe)
13463-40-6
0.1 ppm
0.2 ppm
-
-
Iron salts, soluble (as Fe)
Varies with compound
1 mg/m3
3 mg/m3
-
-
Isoamyl acetate
123-92-2
100 ppm
150 ppm
-
-
Isoamyl alcohol (primary and secondary)
123-51-3
100 ppm
125 ppm
-
-
Isobutyl acetate
110-19-0
150 ppm
188 ppm
-
-
Isobutyl alcohol
78-83-1
50 ppm
75 ppm
-
-
Isooctyl alcohol
26952-21-6
50 ppm
75 ppm
-
X
Isophorone
78-59-1
4 ppm
-
5 ppm
-
Isophorone diisocyanate
4098-71-9
0.005 ppm
0.02 ppm
-
X
Isopropoxyethanol
109-59-1
25 ppm
38 ppm
-
-
Isopropyl acetate
108-21-4
250 ppm
310 ppm
-
-
Isopropyl alcohol
67-63-0
400 ppm
500 ppm
-
-
Isopropylamine
75-31-0
5 ppm
10 ppm
-
-
N-Isopropylaniline
768-52-5
2 ppm
4 ppm
-
X
Isopropyl ether
108-20-3
250 ppm
313 ppm
-
-
Isopropyl glycidyl ether (IGE)
4016-14-2
50 ppm
75 ppm
-
-
Kaolin
-
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Ketene
463-51-4
0.5 mg/m3
1. 5 mg/m3
-
-
Lannate (Methomyl)
16752-77-5
2.5 mg/m3
5 mg/m3
-
-
Lead, inorganic (as Pb)
7439-92-1
0.05 mg/m3
-
-
-
Lead arsenate (as Pb)
3687-31-8
0.05 mg/m3
-
-
-
Lead chromate (as Pb)
7758-97-6
0.05 mg/m3
-
-
-
Limestone
1317-65-3
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Lindane
58-89-9
0.5 mg/m3
1. 5 mg/m3
-
X
Lithium hydride
7580-67-8
0.025 mg/m3
0.075 mg/m3
-
-
L.P.G. (liquified petroleum gas)
68476-85-7
1,000 ppm
1,250 ppm
-
-
Magnesite
546-93-0
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Magnesium oxide fume
1309-48-4
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Malathion
121-75-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
X
Maleic anhydride
108-31-6
0.25 ppm
0.75 ppm
-
-
Manganese and compounds (as Mn)
7439-96-5
-
-
5 mg/m3
-
Manganese cyclopentadienyl tricarbonyl (as Mn)
12079-65-1
0.1 mg/m3
0.3 mg/m3
-
X
Manganese tetroxide and fume (as Mn)
7439-96-5
1 mg/m3
3 mg/m3
-
-
Marble
1317-65-3
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
MBOCA (4, 4'-Methylene bis (2-chloro-aniline))
101-14-4
-
-
-
X
MDA(4, 4-Methylene dianiline)
101-77-9
0.01 ppm
0.1 ppm
-
X
MDI (Methylene bisphenyl isocyanate) (Diphenylmethane
							 diisocyanate)
101-68-8
-
-
0.02 ppm
-
MEK(Methyl ethyl ketone) (2-Butanone)
78-93-3
200 ppm
300 ppm
-
-
MEKP(Methyl ethyl ketone peroxide)
1338-23-4
-
-
0.2 ppm
-
Mercury (as Hg)
7439-97-6
-
-
-
-
Aryl and inorganic
-
0.1 mg/m3
0.3 mg/m3
-
X
Organo-alkyl compounds
-
0.01 mg/m3
0.03 mg/m3
-
X
Vapor
-
0.05 mg/m3
0.15 mg/m3
-
X
Mesityl oxide
141-79-7
15 ppm
25 ppm
-
-
Methacrylic acid
79-41-4
20 ppm
30 ppm
-
X
Methane
-
Simple asphyxiant
-
-
-
Methanethiol (Methyl mercaptan)
74-93-1
0.5 ppm
1. 5 ppm
-
-
Methanol (Methyl alcohol)
67-56-1
200 ppm
250 ppm
-
X
Methomyl (lannate)
16752-77-5
2.5 mg/m3
5 mg/m3
-
-
Methoxychlor
72-43-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
2-Methoxyethanol (Methyl cellosolve)
109-86-4
5 ppm
10 ppm
-
X
2-Methoxyethyl acetate (Methyl cellosolve
							 acetate)
110-49-6
5 ppm
10 ppm
-
X
4-Methoxyphenol
150-76-5
5 mg/m3
10 mg/m3
-
-
Methyl acetate
79-20-9
200 ppm
250 ppm
-
-
Methyl acetylene (propyne)
74-99-7
1,000 ppm
1,250 ppm
-
-
Methyl acetylene-propadiene mixture (MAPP)
-
1,000 ppm
1,250 ppm
-
-
Methyl acrylate
96-33-3
10 ppm
20 ppm
-
X
Methylacrylonitrile
126-98-7
1 ppm
3 ppm
-
X
Methylal (Dimethoxy-methane)
109-87-5
1,000 ppm
1,250 ppm
-
-
Methyl alcohol (methanol)
67-56-1
200 ppm
250 ppm
-
X
Methylamine
74-89-5
10 ppm
20 ppm
-
-
Methyl amyl alcohol (Methyl isobutyl carbinol)
108-11-2
25 ppm
40 ppm
-
X
Methyl n-amyl ketone (2-Heptanone)
110-43-0
50 ppm
75 ppm
-
-
N-Methyl aniline (Monomethyl aniline)
100-61-8
0.5 ppm
1. 5 ppm
-
X
Methyl bromide
74-83-9
5 ppm
10 ppm
-
X
Methyl-n-butyl ketone (2-Hexanone)
591-78-6
5 ppm
10 ppm
-
-
Methyl cellosolve (2-Methoxyethanol)
109-86-4
5 ppm
10 ppm
-
X
Methyl cellosolve acetate (2-Methoxyethyl
							 acetate)
110-49-6
5 ppm
10 ppm
-
X
Methyl chloride
74-87-3
50 ppm
100 ppm
-
-
Methyl chloroform (1, 1, 1-trichlorethane)
71-55-6
350 ppm
450 ppm
-
-
Methyl chloromethyl ether (chloromethyl methyl
							 ether)
107-30-2
-
-
-
-
Methyl 2-cyanoacrylate
137-05-3
2 ppm
4 ppm
-
-
Methylcyclohexane
108-87-2
400 ppm
500 ppm
-
-
Methylcyclohexanol
25639-42-3
50 ppm
75 ppm
-
-
Methylcyclohexanone
583-60-8
50 ppm
75 ppm
-
X
Methylcyclopentadienyl manganese tricarbonyl (as
							 Mn)
12108-13-3
0.2 mg/m3
0.6 mg/m3
-
X
Methyl demeton
8022-00-2
0.5 mg/m3
1. 5 mg/m3
-
X
Methylene bisphenyl isocyanate (MDI) (Diphenylmethane
							 diisocyanate)
101-68-8
-
-
0.02 ppm
-
4, 4'-Methylene bis(2-chloro-aniline) (MBOCA)
101-14-4
-
-
-
X
Methylene bis (4-cyclohexylisocyanate)
5124-30-1
-
-
0.01 ppm
-
Methylene chloride (Dichloromethane)
75-09-2
25 ppm
125 ppm
-
-
4, 4-Methylene dianiline (MDA)
101-77-9
0.01 ppm
0.1 ppm
-
X
Methyl ethyl ketone (MEK) (2-Butanone)
78-93-3
200 ppm
300 ppm
-
-
Methyl ethyl ketone peroxide (MEKP)
1338-23-4
-
-
0.2 ppm
-
Methyl formate
107-31-3
100 ppm
150 ppm
-
-
5-Methyl-3-heptanone (Ethyl amyl ketone)
541-85-5
25 ppm
38 ppm
-
-
Methyl hydrazine (Monomethyl hydrazine)
60-34-4
-
-
0.2 ppm
X
Methyl iodide
74-88-4
2 ppm
4 ppm
-
X
Methyl isoamyl ketone
110-12-3
50 ppm
75 ppm
-
-
Methyl isobutyl carbinol (Methyl amyl alcohol)
108-11-2
25 ppm
40 ppm
-
X
Methyl isobutyl ketone (Hexone)
108-10-1
50 ppm
75 ppm
-
-
Methyl isocyanate
624-83-9
0.02 ppm
0.06 ppm
-
X
Methyl isopropyl ketone
563-80-4
200 ppm
250 ppm
-
-
Methyl mercaptan (Methanethiol)
74-93-1
0.5 ppm
1. 5 ppm
-
-
Methyl methacrylate
80-62-6
100 ppm
150 ppm
-
-
Methyl parathion
298-00-0
0.2 mg/m3
0.6 mg/m3
-
X
Methyl propyl ketone (2-Pentanone)
107-87-9
200 ppm
250 ppm
-
-
Methyl silicate
684-84-5
1 ppm
3 ppm
-
-
alpha-Methyl styrene
98-83-9
50 ppm
100 ppm
-
-
Mevinphos (Phosdrin)
7786-34-7
0.01 ppm
0.03 ppm
-
X
Metribuzin
21087-64-9
5 mg/m3
10 mg/m3
-
-
Mica (Silicates) Respirable fraction
12001-26-2
3 mg/m3
6 mg/m3
-
-
Molybdenum (as Mo)
7439-98-7
-
-
-
-
Soluble compounds
-
5 mg/m3
10 mg/m3
-
-
Insoluble compounds
-
10 mg/m3
20 mg/m3
-
-
Monochlorobenzene (Chlorobenzene)
108-90-7
75 ppm
113 ppm
-
-
Monocrotophos (Azodrin)
6923-22-4
0.25 mg/m3
0.75 mg/m3
-
-
Monomethyl aniline (N-Methyl aniline)
100-61-8
0.5 ppm
1. 5 ppm
-
X
Monomethyl hydrazine
-
-
-
0.2 ppm
-
Morpholine
110-91-8
20 ppm
30 ppm
-
X
Naled (Dibrom)
300-76-5
3 mg/m3
6 mg/m3
-
X
Naphtha
8030-30-6
100 ppm
150 ppm
-
X
Naphthalene
91-20-3
10 ppm
15 ppm
-
-
alpha-Naphthylamine
134-32-7
-
-
-
-
beta-Naphthylamine
91-59-8
-
-
-
-
Neon
7440-01-9
Simple asphyxiant
-
-
-
Nickel carbonyl (as Ni)
13463-39-3
0.001 ppm
0.003 ppm
-
-
Nickel (as Ni)
7440-02-0
-
-
-
-
Metal and insoluble compounds
-
1 mg/m3
3 mg/m3
-
-
Soluble compounds
-
0.1 mg/m3
0.3 mg/m3
-
-
Nicotine
54-11-5
0.5 mg/m3
1. 5 mg/m3
-
X
Nitrapyrin (2-Chloro-6 trichloromethyl pyridine)
1929-82-4
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Nitric acid
7697-37-2
2 ppm
4 ppm
-
-
Nitric oxide
10102-43-9
25 ppm
38 ppm
-
-
p-Nitroaniline
100-01-6
3 mg/m3
6 mg/m3
-
X
Nitrobenzene
98-95-3
1 ppm
3 ppm
-
X
4-Nitrobiphenyl
92-93-3
-
-
-
-
p-Nitrochlorobenzene
100-00-5
0.5 mg/m3
1. 5 mg/m3
-
X
4-Nitrodiphenyl
-
-
-
-
-
Nitroethane
79-24-3
100 ppm
150 ppm
-
-
Nitrogen
7727-37-9
Simple asphyxiant
-
-
-
Nitrogen dioxide
10102-44-0
-
1 ppm
-
-
Nitrogen oxide (Nitrous oxide)
10024-97-2
50 ppm
75 ppm
-
-
Nitrogen trifluoride
7783-54-2
10 ppm
20 ppm
-
-
Nitroglycerin
55-63-0
-
0.1 mg/m3
-
X
Nitromethane
75-52-5
100 ppm
150 ppm
-
-
1-Nitropropane
108-03-2
25 ppm
38 ppm
-
-
2-Nitropropane
79-46-9
10 ppm
20 ppm
-
-
N-Nitrosodimethylamine
62-75-9
-
-
-
-
Nitrotoluene
-
-
-
-
-
o-isomer
88-72-2
2 ppm
4 ppm
-
X
m-isomer
98-08-2
2 ppm
4 ppm
-
X
p-isomer
99-99-0
2 ppm
4 ppm
-
X
Nitrotrichloromethane (Chloropicrin)
76-06-2
0.1 ppm
0.3 ppm
-
-
Nitrous oxide (Nitrogen oxide)
10024-97-2
50 ppm
75 ppm
-
-
Nonane
111-84-2
200 ppm
250 ppm
-
-
Octachloronaphthalene
2234-13-1
0.1 mg/m3
0.3 mg/m3
-
X
Octane
111-65-9
300 ppm
375 ppm
-
-
Oil mist mineral (particulate)
8012-95-1
5 mg/m3
10 mg/m3
-
-
Osmium tetroxide (as Os)
20816-12-0
0.0002 ppm
0.0006 ppm
-
-
Oxalic acid
144-62-7
1 mg/m3
2 mg/m3
-
-
Oxygen difluoride
7783-41-7
-
-
0.05 ppm
-
Ozone
10028-15-6
0.1 ppm
0.3 ppm
-
-
Paper fiber (Cellulose)
9004-34-6
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Paraffin wax fume
8002-74-2
2 mg/m3
4 mg/m3
-
-
Paraquat
-
-
-
-
-
Respirable fraction
4685-14-7 1910-42-5 2074-50-2
0.1 mg/m3
0.3 mg/m3
-
X
Parathion
56-38-2
0.1 mg/m3
0.3 mg/m3
-
X
Particulate polycyclic aromatic hydrocarbons (benzene
							 soluble fraction) (coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
-
-
Particulates not otherwise regulated
-
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Pentaborane
19624-22-7
0.005 ppm
0.015 ppm
-
-
Pentachloronaphthalene
1321-64-8
0.5 mg/m3
1. 5 mg/m3
-
X
Pentachlorophenol
87-86-5
0.5 mg/m3
1. 5 mg/m3
-
X
Pentaerythritol
115-77-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Pentane
109-66-0
600 ppm
750 ppm
-
-
2-Pentanone (methyl propyl ketone)
107-87-9
200 ppm
250 ppm
-
-
Perchloroethylene (tetrachloroethylene)
127-18-4
25 ppm
38 ppm
-
-
Perchloromethyl mercaptan
594-42-3
0.1 ppm
0.3 ppm
-
-
Perchloryl fluoride
7616-94-6
3 ppm
6 ppm
-
-
Perlite
-
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Petroleum distillates (Naptha, rubber solvent)
-
100 ppm
150 ppm
-
-
Phenacyl chloride (a-Chloroacetophenone)
532-21-4
0.05 ppm
0.15 ppm
-
-
Phenol
108-95-2
5 ppm
10 ppm
-
X
Phenothiazine
92-84-2
5 mg/m3
10 mg/m3
-
X
p-Phenylene diamine
106-50-3
0.1 mg/m3
0.3 mg/m3
-
X
Phenyl ether (vapor)
101-84-8
1 ppm
3 ppm
-
-
Phenyl ether-diphenyl mixture (vapor)
-
1 ppm
3 ppm
-
-
Phenylethylene (Styrene)
100-42-5
50 ppm
100 ppm
-
-
Phenyl glycidyl ether (PGE)
122-60-1
1 ppm
3 ppm
-
-
Phenylhydrazine
100-63-0
5 ppm
10 ppm
-
X
Phenyl mercaptan
108-98-5
0.5 ppm
1. 5 ppm
-
-
Phenylphosphine
638-21-1
-
-
0.05 ppm
-
Phorate
298-02-2
0.05 mg/m3
0.2 mg/m3
-
X
Phosdrin (Mevinphos)
7786-34-7
0.01 ppm
0.03 ppm
-
X
Phosgene (carbonyl chloride)
75-44-5
0.1 ppm
0.3 ppm
-
-
Phosphine
7803-51-2
0.3 ppm
1 ppm
-
-
Phosphoric acid
7664-38-2
1 mg/m3
3 mg/m3
-
-
Phosphorus (yellow)
7723-14-0
0.1 mg/m3
0.3 mg/m3
-
-
Phosphorous oxychloride
10025-87-3
0.1 ppm
0.3 ppm
-
-
Phosphorus pentachloride
10026-13-8
0.1 ppm
0.3 ppm
-
-
Phosphorus pentasulfide
1314-80-3
1 mg/m3
3 mg/m3
-
-
Phosphorus trichloride
12-2-19
0.2 ppm
0.5 ppm
-
-
Phthalic anhydride
85-44-9
1 ppm
3 ppm
-
-
m-Phthalodinitrile
626-17-5
5 mg/m3
10 mg/m3
-
-
Picloram
1918-02-1
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Picric acid (2, 4, 6-Trinitrophenol)
88-89-1
0.1 mg/m3
0.3 mg/m3
-
X
Pindone(2-Pivalyl-1, 3-indandione, Pival)
83-26-1
0.1 mg/m3
0.3 mg/m3
-
-
Piperazine dihydrochloride
142-64-3
5 mg/m3
10 mg/m3
-
-
Pival (Pindone)
83-26-1
0.1 mg/m3
0.3 mg/m3
-
-
Plaster of Paris
26499-65-0
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Platinum (as Pt)
7440-06-4
-
-
-
-
Metal
-
1 mg/m3
3 mg/m3
-
-
Soluble salts
-
0.002 mg/m3
0.006 mg/m3
-
-
Polychlorobiphenyls (Chlorodiphenyls)
-
-
-
-
-
42% Chlorine (PCB)
53469-21-9
1 mg/m3
3 mg/m3
-
X
54% Chlorine (PCB)
11097-69-1
0.5 mg/m3
1. 5 mg/m3
-
X
Portland cement
65997-15-1
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Potassium hydroxide
1310-58-3
-
-
2 mg/m3
-
Propane
74-98-6
1,000 ppm
1,250 ppm
-
-
Propargyl alcohol
107-19-7
1 ppm
3 ppm
-
X
beta-Propiolactone
57-57-8
-
-
-
-
Propionic acid
79-09-4
10 ppm
20 ppm
-
-
Propoxur (Baygon)
114-26-1
0.5 mg/m3
1. 5 mg/m3
-
-
n-Propyl acetate
109-60-4
200 ppm
250 ppm
-
-
n-Propyl alcohol
71-23-8
200 ppm
250 ppm
-
X
n-Propyl nitrate
627-13-4
25 ppm
40 ppm
-
-
Propylene
-
Simple asphyxiant
-
-
-
Propylene dichloride (1, 2-Dichloropropane)
78-87-5
75 ppm
110 ppm
-
-
Propylene glycol dinitrate
6423-43-4
0.05 ppm
0.15 ppm
-
X
Propylene glycol monomethyl ether
107-98-2
100 ppm
150 ppm
-
-
Propylene imine
75-55-8
2 ppm
4 ppm
-
X
Propylene oxide (1,2-Epoxypropane)
75-56-9
20 ppm
30 ppm
-
-
Propyne (Methyl acetylene)
74-99-7
1,000 ppm
1,250 ppm
-
-
Pyrethrum
8003-34-7
5 mg/m3
10 mg/m3
-
-
Pyridine
110-86-1
5 ppm
10 ppm
-
-
Pyrocatachol (Catechol)
120-80-9
5 ppm
10 ppm
-
X
Quinone (p-Benzoquinone)
106-51-4
0.1 ppm
0.3 ppm
-
-
RDX (Cyclonite)
-
1. 5 mg/m3
3 mg/m3
-
X
Resorcinol
108-46-3
10 ppm
20 ppm
-
-
Rhodium (as Rh)
7440-16-6
-
-
-
-
Insoluble compounds, metal fumes and dusts
-
0.1 mg/m3
0.3 mg/m3
-
-
Soluble compounds, salts
-
0.001 mg/m3
0.003 mg/m3
-
-
Ronnel
299-84-3
10 mg/m3
20 mg/m3
-
-
Rosin core solder, pyrolysis products (as
							 formaldehyde)
8050-09-7
0.1 mg/m3
0.3 mg/m3
-
-
Rotenone
83-79-4
5 mg/m3
10 mg/m3
-
-
Rouge
-
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Rubber solvent (naphtha)
8030-30-6
100 ppm
150 ppm
-
-
Selenium compounds (as Se)
7782-49-2
0.2 mg/m3
0.6 mg/m3
-
-
Selenium hexafluoride (as Se)
7783-79-1
0.05 ppm
0.15 ppm
-
-
Sesone (Crag herbicide)
136-78-7
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Sevin (Carbaryl)
63-25-2
5 mg/m3
10 mg/m3
-
-
Silane (see Silicon tetrahydride)
7803-62-5
5 ppm
10 ppm
-
-
Silica, amorphous, precipitated and gel
112926-00-8
6 mg/m3
12 mg/m3
-
-
Silica, amorphous, diatomaceous earth, containing less
							 than 1% crystalline silica
61790-53-2
-
-
-
-
Total particulate
-
6 mg/m3
12 mg/m3
-
-
Respirable fraction
-
3 mg/m3
6 mg/m3
-
-
Silica, crystalline cristobalite
-
-
-
-
-
Respirable fractionApplies where the exposure limit in
							 chapter 296-840 WAC is not in effect.
14464-46-1
0.05 mg/m3
0.15 mg/m3
-
-
Silica, crystalline quartz
-
-
-
-
-
Respirable fractionApplies where the exposure limit in
							 chapter 296-840 WAC is not in effect.
14808-60-7
0.1 mg/m3
0.3 mg/m3
-
-
Silica, crystalline tripoli (as quartz)
-
-
-
-
-
Respirable fraction
1317-95-9
0.1 mg/m3
0.3 mg/m3
-
-
Silica, crystalline tridymite
-
-
-
-
-
Respirable fractionApplies where the exposure limit in
							 chapter 296-840 WAC is not in effect.
15468-32-3
0.05 mg/m3
0.15 mg/m3
-
-
Silica, fused
-
-
-
-
-
Respirable fraction
60676-86-0
0.1 mg/m3
0.3 mg/m3
-
-
Silicates (less than 1% crystalline silica)
-
-
-
-
-
Mica
-
-
-
-
-
Respirable fraction
12001-26-2
3 mg/m3
6 mg/m3
-
-
Soapstone
-
-
-
-
-
Total particulate
-
6 mg/m3
12 mg/m3
-
-
Respirable fraction
-
3 mg/m3
6 mg/m3
-
-
Talc (containing asbestos)
-
-
-
-
-
Talc (containing no asbestos)
-
-
-
-
-
Respirable fraction
14807-96-6
2 mg/m3
4 mg/m3
-
-
Tremolite
-
-
-
-
-
Silicon
7440-21-3
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Silicon carbide
409-21-2
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Silicon tetrahydride (Silane)
7803-62-5
5 ppm
10 ppm
-
-
Silver, metal dust and soluble compounds (as Ag)
7440-22-4
0.01 mg/m3
0.03 mg/m3
-
-
Soapstone
-
-
-
-
-
Total particulate
-
6 mg/m3
12 mg/m3
-
-
Respirable fraction
-
3 mg/m3
6 mg/m3
-
-
Sodium azide (as HN3 or NaN3)
26628-22-8
-
-
0.1 ppm
X
Sodium bisulfite
7631-90-5
5 mg/m3
10 mg/m3
-
-
Sodium-2,4-dichloro-phenoxyethyl sulfate (Crag
							 herbicide)
136-78-7
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Sodium fluoroacetate
62-74-8
0.05 mg/m3
0.15 mg/m3
-
X
Sodium hydroxide
1310-73-2
-
-
2 mg/m3
-
Sodium metabisulfite
7681-57-4
5 mg/m3
10 mg/m3
-
-
Starch
9005-25-8
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Stibine
7803-52-3
0.1 ppm
0.3 ppm
-
-
Stoddard solvent
8052-41-3
100 ppm
150 ppm
-
-
Strychnine
57-24-9
0.15 mg/m3
0.45 mg/m3
-
-
Styrene (Phenylethylene, Vinyl benzene)
100-42-5
50 ppm
100 ppm
-
-
Subtilisins
9014-01-1
-
0.00006 mg/m3 (60
							 min.)
-
-
Sucrose
57-50-1
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Sulfotep (TEDP)
3689-24-5
0.2 mg/m3
0.6 mg/m3
-
X
Sulfur dioxide
7446-09-5
2 ppm
5 ppm
-
-
Sulfur hexafluoride
2551-62-4
1,000 ppm
1,250 ppm
-
-
Sulfuric acid
7664-93-9
1 mg/m3
3 mg/m3
-
-
Sulfur monochloride
10025-67-9
-
-
1 ppm
-
Sulfur pentafluoride
5714-22-1
-
-
0.01 ppm
-
Sulfur tetrafluoride
7783-60-0
-
-
0.1 ppm
-
Sulfuryl fluoride
2699-79-8
5 ppm
10 ppm
-
-
Sulprofos
35400-43-2
1 mg/m3
3 mg/m3
-
-
Systox (Demeton)
8065-48-3
0.01 ppm
0.03 ppm
-
X
2, 4, 5-T
93-76-5
10 mg/m3
20 mg/m3
-
-
Talc (containing asbestos)
-
-
-
-
-
Talc (containing no asbestos)
-
-
-
-
-
Respirable fraction
14807-96-6
2 mg/m3
4 mg/m3
-
-
Tantalum
-
-
-
-
-
Metal and oxide dusts
7440-25-7
5 mg/m3
10 mg/m3
-
-
TDI(Toluene-2, 4-diisocyanate)
584-84-9
0.005 ppm
0.02 ppm
-
-
TEDP (Sulfotep)
3689-24-5
0.2 mg/m3
0.6 mg/m3
-
X
Tellurium and compounds (as Te)
13494-80-9
0.1 mg/m3
0.3 mg/m3
-
-
Tellurium hexafluoride (as Te)
7783-80-4
0.02 ppm
0.06 ppm
-
-
Temephos (Abate)
3383-96-8
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
TEPP
107-49-3
0.004 ppm
0.012 ppm
-
X
Terphenyls
26140-60-3
-
-
0.5 ppm
-
1, 1, 1, 2-Tetrachloro-2, 2-difluoroethane
76-11-0
500 ppm
625 ppm
-
-
1, 1, 2, 2-Tetrachloro-1, 2-difluoroethane
76-12-0
500 ppm
625 ppm
-
-
1, 1, 2, 2-Tetrachloroethane
79-34-5
1 ppm
3 ppm
-
X
Tetrachloroethylene (Perchloroethylene)
127-18-4
25 ppm
38 ppm
-
-
Tetrachloromethane (Carbon tetrachloride)
56-23-5
2 ppm
4 ppm
-
X
Tetrachloronaphthalene
1335-88-2
2 mg/m3
4 mg/m3
-
X
Tetraethyl lead (as Pb)
78-00-2
0.075 mg/m3
0.225 mg/m3
-
X
Tetrahydrofuran
109-99-9
200 ppm
250 ppm
-
-
Tetramethyl lead (as Pb)
75-74-1
0.075 mg/m3
0.225 mg/m3
-
X
Tetramethyl succinonitrile
3333-52-6
0.5 ppm
1. 5 ppm
-
X
Tetranitromethane
509-14-8
1 ppm
3 ppm
-
-
Tetrasodium pyrophosphate
7722-88-5
5 mg/m3
10 mg/m3
-
-
Tetryl (2, 4, 6-trinitrophenyl-methylnitramine)
479-45-8
1. 5 mg/m3
3 mg/m3
-
X
Thallium (soluble compounds) (as Tl)
7440-28-0
0.1 mg/m3
0.3 mg/m3
-
X
4, 4-Thiobis
(6-tert-butyl-m-cresol)
96-69-5
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Thiodan (Endosulfan)
115-29-7
0.1 mg/m3
0.3 mg/m3
-
X
Thioglycolic acid
68-11-1
1 ppm
3 ppm
-
X
Thionyl chloride
7719-09-7
-
-
1 ppm
-
Thiram
137-26-8
5 mg/m3
10 mg/m3
-
-
Tin (as Sn)
-
-
-
-
-
Inorganic compounds
7440-31-5
2 mg/m3
4 mg/m3
-
-
Tin (as Sn)
-
-
-
-
-
Organic compounds
7440-31-5
0.1 mg/m3
0.3 mg/m3
-
X
Tin oxide (as Sn)
21651-19-4
2 mg/m3
4 mg/m3
-
-
Titanium dioxide
13463-67-7
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
TNT (2, 4, 6-Trinitrotoluene)
118-96-7
0.5 mg/m3
1. 5 mg/m3
-
X
Toluene
108-88-3
100 ppm
150 ppm
-
-
Toluene-2, 4-diisocyanate (TDI)
584-84-9
0.005 ppm
0.02 ppm
-
-
m-Toluidine
108-44-1
2 ppm
4 ppm
-
X
o-Toluidine
95-53-4
2 ppm
4 ppm
-
X
p-Toluidine
106-49-0
2.0 ppm
4 ppm
-
X
Toxaphene (Chlorinated camphene)
8001-35-2
0.5 mg/m3
1 mg/m3
-
X
Tremolite
-
-
-
-
-
Tributyl phosphate
126-73-8
0.2 ppm
0.6 ppm
-
-
Trichloroacetic acid
76-03-9
1 ppm
3 ppm
-
-
1, 2, 4-Trichlorobenzene
120-82-1
-
-
5 ppm
-
1, 1, 1-Trichloroethane (Methyl chloroform)
71-55-6
350 ppm
450 ppm
-
-
1, 1, 2-Trichloroethane
79-00-5
10 ppm
20 ppm
-
-
Trichloroethylene
79-01-6
50 ppm
200 ppm
-
-
Trichlorofluoromethane (Fluorotrichloromethane)
75-69-4
-
-
1,000 ppm
-
Trichloromethane (Chloroform)
67-66-3
2 ppm
4 ppm
-
-
Trichloronaphthalene
1321-65-9
5 mg/m3
10 mg/m3
-
X
1, 2, 3-Trichloropropane
96-18-4
10 ppm
20 ppm
-
X
1, 1, 2-Trichloro-1, 2, 2-trifluoroethane
76-13-1
1,000 ppm
1,250 ppm
-
-
Tricyclohexyltin hydroxide (Cyhexatin)
13121-70-5
5 mg/m3
10 mg/m3
-
-
Triethylamine
121-44-8
10 ppm
15 ppm
-
-
Trifluorobromomethane
75-63-8
1,000 ppm
1,250 ppm
-
-
Trimellitic anhydride
552-30-7
0.005 ppm
0.015 ppm
-
-
Trimethylamine
75-50-3
10 ppm
15 ppm
-
-
Trimethyl benzene
25551-13-7
25 ppm
38 ppm
-
-
Trimethyl phosphite
121-45-9
2 ppm
4 ppm
-
-
2, 4, 6-Trinitrophenol (Picric acid)
88-89-1
0.1 mg/m3
0.3 mg/m3
-
X
2, 4, 6-Trinitrophenyl-methylnitramine (Tetryl)
479-45-8
1. 5 mg/m3
3 mg/m3
-
X
2, 4, 6-Trinitrotoluene (TNT)
118-96-7
0.5 mg/m3
1. 5 mg/m3
-
X
Triorthocresyl phosphate
78-30-8
0.1 mg/m3
0.3 mg/m3
-
X
Triphenyl amine
603-34-9
5 mg/m3
10 mg/m3
-
-
Triphenyl phosphate
115-86-6
3 mg/m3
6 mg/m3
-
-
Tungsten (as W)
7440-33-7
-
-
-
-
Soluble compounds
-
1 mg/m3
3 mg/m3
-
-
Insoluble compounds
-
5 mg/m3
10 mg/m3
-
-
Turpentine
8006-64-2
100 ppm
150 ppm
-
-
Uranium (as U)
7440-61-1
-
-
-
-
Soluble compounds
-
0.05 mg/m3
0.15 mg/m3
-
-
Insoluble compounds
-
0.2 mg/m3
0.6 mg/m3
-
-
n-Valeraldehyde
110-62-3
50 ppm
75 ppm
-
-
Vanadium (as V2O5)
-
-
-
-
-
Respirable fraction
1314-62-1
0.05 mg/m3
0.15 mg/m3
-
-
Vegetable oil mist
-
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Vinyl acetate
108-05-1
10 ppm
20 ppm
-
-
Vinyl benzene (Styrene)
100-42-5
50 ppm
100 ppm
-
-
Vinyl bromide
593-60-2
5 ppm
10 ppm
-
-
Vinyl chloride (Chloroethylene)
75-01-4
1 ppm
5 ppm
-
-
Vinyl cyanide (Acrylonitrile)
107-13-1
2 ppm
10 ppm
-
-
Vinyl cyclohexene dioxide
106-87-6
10 ppm
20 ppm
-
X
Vinyl toluene
25013-15-4
50 ppm
75 ppm
-
-
Vinylidene chloride (1, 1-Dichloroethylene)
75-35-4
1 ppm
3 ppm
-
-
VM & P Naphtha
8032-32-4
300 ppm
400 ppm
-
-
Warfarin
81-81-2
0.1 mg/m3
0.3 mg/m3
-
-
Welding fumes (total particulate)
-
5 mg/m3
10 mg/m3
-
-
Wood dust
-
-
-
-
-
Nonallergenic; (All woods except allergenics)
-
5 mg/m3
10 mg/m3
-
-
Allergenics (e.g. cedar, mahogany and teak)
-
2.5 mg/m3
5 mg/m3
-
-
Xylenes (ortho, meta, and para isomers)
							 (Dimethylbenzene)
1330-20-7
100 ppm
150 ppm
-
-
m-Xylene alpha, alpha-diamine
1477-55-0
-
-
0.1 mg/m3
X
Xylidine (Dimethylaminobenzene)
1300-73-8
2 ppm
4 ppm
-
X
Yttrium
7440-65-5
1 mg/m3
3 mg/m3
-
-
Zinc chloride fume
7646-85-7
1 mg/m3
2 mg/m3
-
-
Zinc chromate (as CrO3)
Varies with compound
0.05 mg/m3
-
0.1 mg/m3
-
Zinc oxide
1314-13-2
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m
-
-
Zinc oxide fume
1314-13-2
5 mg/g3
10 mg/m3
-
-
Zinc stearate
557-05-1
-
-
-
-
Total particulate
-
10 mg/m3
20 mg/m3
-
-
Respirable fraction
-
5 mg/m3
10 mg/m3
-
-
Zirconium compounds (as Zr)
7440-67-2
5 mg/m3
10 mg/m3
-
-
Statutory Authority:
						RCW
						 49.17.010,
						49.17.040,
						49.17.050,
						49.17.060. 06-08-087, §
						296-307-62625, filed 4/4/06, effective 9/1/06; 05-01-166, § 296-307-62625,
						filed 12/21/04, effective 4/2/05.