WAC 173-401-531
WAC 173-401-531. Thresholds for hazardous air pollutants
General. The following tables provide thresholds for hazardous air pollutants:
(1) Carcinogens:
CAS Number Chemical Name Threshold Levels (tons/year) 189-55-9 1, 2, 7, 8-dibenzopyrene 0.005 107-06-2 1, 2-dichloroethane 0.4 78-87-5 1, 2-dichloropropane 0.5 540-73-8 1, 2-dimethylhydrazine 0.004 122-66-7 1, 2-diphenylhydrazine 0.045 106-99-0 1, 3-butadiene 0.035 1120-71-4 1, 3-propane sultone 0.003 106-46-7 1, 4-dichlorobenzene (p) 0.5 123-91-1 1, 4-dioxane (1, 4-diethyleneoxide) 0.5 94-75-7 2, 4-d salts & esters 0.5 95-80-7 2, 4-toluene diamine 0.01 584-84-9 2, 4-toluene diisocyanate 0.05 53-96-3 2-acetylaminofluorene 0.0025 119-90-4 3, 3'-dimethoxybenzidine 0.5 119-93-7 3, 3-dimethyl benzidine 0.004 101-14-4 4, 4'-methylenebis (2-chloroaniline) 0.5 75-07-0 acetaldehyde 0.5 107-13-1 acrylonitrile 0.15 62-53-3 aniline 0.5 C7440-38-2 arsenic and inorganic arsenic compounds 0.002 1332-21-4 asbestos (fibers/ml) 0.00004 71-43-2 benzene 0.5 92-87-5 benzidine (and its salts) 0.00015 56-55-3 benzo(a)anthracene 0.005 50-32-8 benzo(a)pyrene 0.005 205-99-2 benzo(b)fluoranthene 0.005 7440-41-7 beryllium and compounds (except salts) 0.004 117-81-7 bis (2-ethylhexyl) phthalate 0.5 542-88-1 bis (chloromethyl) ether 0.00015 75-25-2 bromoform 0.5 7440-43-9 cadmium and compounds 0.005 56-23-5 carbon tetrachloride 0.5 57-74-9 chlordane 0.005 510-15-6 chlorobenzilate 0.2 67-66-3 chloroform 0.45 107-30-2 chloromethyl methyl ether 0.1 126-99-8 chloroprene 0.5 C7440-47-3 chromium, hexavalent metal 0.001 218-01-9 chrysene 0.005 ——— coke oven emissions 0.015 3547-04-4 DDE 0.005 53-70-3 dibenz(a, h)anthracene 0.005 132-64-9 dibenzofuran 0.5 111-44-4 dichloroethyl ether 0.03 75-09-2 dichloromethane 0.5 77-78-1 dimethyl sulfate 0.1 ——— dioxins & furans (tcdd equivalent) 3e-07 106-89-8 epichlorohydrin 0.5 107-06-2 ethylene dichloride 0.4 106-93-4 ethylene dibromide (dibromethane) 0.05 75-21-8 ethylene oxide 0.1 96-45-7 ethylene thiourea 0.3 76-44-8 heptachlor 0.01 118-74-1 hexachlorobenzene 0.005 58-89-9 hexachlorocyclohexane, gamma 0.005 302-01-2 hydrazine 0.002 193-39-5 indeno (1, 2, 3-cd) pyrene 0.005 ——— lead & compounds (except those listed) 0.005 58-89-9 lindane 0.005 75-09-2 methylene chloride 0.5 62-75-9 n-nitrosodimethylamine 0.0005 C7440-02-0 nickel and compounds (except those listed) 0.02 13463-39-3 nickel carbonyl 0.1 95-53-4 o-toluidine 0.5 87-86-5 pentachlorophenol 0.35 127-18-4 perchloroethylene 0.5 1336-36-3 polychlorinated biphenyls 0.0045 75-56-9 propylene oxide 0.5 8001-35-2 toxaphene 0.005 79-01-6 trichloroethylene 0.5 75-01-4 vinyl chloride 0.1 79-34-5 1, 1, 2, 2-tetrachloroethane 0.15 79-00-5 1, 1, 2-trichloroethane 0.5 57-14-7 1, 1-dimethyl hydrazine 0.004 96-12-8 1, 2-dibromo-3-chloropropane 0.004 79-06-1 acrylamide 0.01 98-07-7 benzotrichloride 0.003 62-73-7 dichlorvos 0.1 79-44-7 dimethyl carbamoyl chloride 0.5 140-88-5 ethyl acrylate 0.5 51-79-6 ethyl carbamate 0.5 151-56-4 ethylene imine 0.5 87-68-3 hexachlorobutadiene 0.5 67-72-1 hexachloroethane 0.5 60-34-4 methyl hydrazine 0.03 684-93-5 n-nitroso-n-methylurea 0.5 12035-72-2 nickel refinery dust 0.08 ——— nickel subsulfide 0.02 82-68-8 pentachloronitrobenzene 0.15 91-22-5 quinoline 0.003 1582-09-8 trifluralin 0.5 593-60-2 vinyl bromide 0.5 75-35-4 vinylidene chloride 0.2 189559 1, 2: 7, 8-dibenzopyrene 0.005 121142 2, 4-dinitrotoluene 0.01 88062 2, 4, 6-trichlorophenol 0.5 91941 3, 3-dichlorobenzidene 0.1 57596 7, 12-dimethylbenz(a)anthracene 0.005 50000 formaldehyde 0.5
CAS Number
Chemical Name
Threshold Levels
(tons/year)
189-55-9
1, 2, 7, 8-dibenzopyrene
0.005
107-06-2
1, 2-dichloroethane
0.4
78-87-5
1, 2-dichloropropane
0.5
540-73-8
1, 2-dimethylhydrazine
0.004
122-66-7
1, 2-diphenylhydrazine
0.045
106-99-0
1, 3-butadiene
0.035
1120-71-4
1, 3-propane sultone
0.003
106-46-7
1, 4-dichlorobenzene (p)
0.5
123-91-1
1, 4-dioxane (1, 4-diethyleneoxide)
0.5
94-75-7
2, 4-d salts & esters
0.5
95-80-7
2, 4-toluene diamine
0.01
584-84-9
2, 4-toluene diisocyanate
0.05
53-96-3
2-acetylaminofluorene
0.0025
119-90-4
3, 3'-dimethoxybenzidine
0.5
119-93-7
3, 3-dimethyl benzidine
0.004
101-14-4
4, 4'-methylenebis (2-chloroaniline)
0.5
75-07-0
acetaldehyde
0.5
107-13-1
acrylonitrile
0.15
62-53-3
aniline
0.5
C7440-38-2
arsenic and inorganic arsenic compounds
0.002
1332-21-4
asbestos (fibers/ml)
0.00004
71-43-2
benzene
0.5
92-87-5
benzidine (and its salts)
0.00015
56-55-3
benzo(a)anthracene
0.005
50-32-8
benzo(a)pyrene
0.005
205-99-2
benzo(b)fluoranthene
0.005
7440-41-7
beryllium and compounds (except salts)
0.004
117-81-7
bis (2-ethylhexyl) phthalate
0.5
542-88-1
bis (chloromethyl) ether
0.00015
75-25-2
bromoform
0.5
7440-43-9
cadmium and compounds
0.005
56-23-5
carbon tetrachloride
0.5
57-74-9
chlordane
0.005
510-15-6
chlorobenzilate
0.2
67-66-3
chloroform
0.45
107-30-2
chloromethyl methyl ether
0.1
126-99-8
chloroprene
0.5
C7440-47-3
chromium, hexavalent metal
0.001
218-01-9
chrysene
0.005
———
coke oven emissions
0.015
3547-04-4
DDE
0.005
53-70-3
dibenz(a, h)anthracene
0.005
132-64-9
dibenzofuran
0.5
111-44-4
dichloroethyl ether
0.03
75-09-2
dichloromethane
0.5
77-78-1
dimethyl sulfate
0.1
———
dioxins & furans (tcdd equivalent)
3e-07
106-89-8
epichlorohydrin
0.5
107-06-2
ethylene dichloride
0.4
106-93-4
ethylene dibromide (dibromethane)
0.05
75-21-8
ethylene oxide
0.1
96-45-7
ethylene thiourea
0.3
76-44-8
heptachlor
0.01
118-74-1
hexachlorobenzene
0.005
58-89-9
hexachlorocyclohexane, gamma
0.005
302-01-2
hydrazine
0.002
193-39-5
indeno (1, 2, 3-cd) pyrene
0.005
———
lead & compounds (except those listed)
0.005
58-89-9
lindane
0.005
75-09-2
methylene chloride
0.5
62-75-9
n-nitrosodimethylamine
0.0005
C7440-02-0
nickel and compounds (except those listed)
0.02
13463-39-3
nickel carbonyl
0.1
95-53-4
o-toluidine
0.5
87-86-5
pentachlorophenol
0.35
127-18-4
perchloroethylene
0.5
1336-36-3
polychlorinated biphenyls
0.0045
75-56-9
propylene oxide
0.5
8001-35-2
toxaphene
0.005
79-01-6
trichloroethylene
0.5
75-01-4
vinyl chloride
0.1
79-34-5
1, 1, 2, 2-tetrachloroethane
0.15
79-00-5
1, 1, 2-trichloroethane
0.5
57-14-7
1, 1-dimethyl hydrazine
0.004
96-12-8
1, 2-dibromo-3-chloropropane
0.004
79-06-1
acrylamide
0.01
98-07-7
benzotrichloride
0.003
62-73-7
dichlorvos
0.1
79-44-7
dimethyl carbamoyl chloride
0.5
140-88-5
ethyl acrylate
0.5
51-79-6
ethyl carbamate
0.5
151-56-4
ethylene imine
0.5
87-68-3
hexachlorobutadiene
0.5
67-72-1
hexachloroethane
0.5
60-34-4
methyl hydrazine
0.03
684-93-5
n-nitroso-n-methylurea
0.5
12035-72-2
nickel refinery dust
0.08
———
nickel subsulfide
0.02
82-68-8
pentachloronitrobenzene
0.15
91-22-5
quinoline
0.003
1582-09-8
trifluralin
0.5
593-60-2
vinyl bromide
0.5
75-35-4
vinylidene chloride
0.2
189559
1, 2: 7, 8-dibenzopyrene
0.005
121142
2, 4-dinitrotoluene
0.01
88062
2, 4, 6-trichlorophenol
0.5
91941
3, 3-dichlorobenzidene
0.1
57596
7, 12-dimethylbenz(a)anthracene
0.005
50000
formaldehyde
0.5
(2) Noncarcinogens:
CAS Number Chemical Name Threshold Levels (tons/year) 75-34-3 ethylidene dichloride (1, 1-dichloroethane) 0.5 75-55-8 1, 2 propylenimine (2-methyl aziridine) 0.003 120-82-1 1, 2, 4-trichlorobenzene 0.5 106-88-7 1, 2-epoxybutane 0.5 542-75-6 1, 3-dichloropropene (dichloropropene) 0.5 51-28-5 2, 4-dinitrophenol 0.5 111-76-2 2-butoxyethanol 0.5 110-80-5 2-ethoxyethanol 0.5 109-86-4 2-methoxyethanol 0.5 92-93-3 4-nitrobiphenol 0.5 100-02-7 4-nitrophenol 0.5 75-05-8 acetonitrile 0.5 98-86-2 acetophenone 0.5 107-02-8 acrolein 0.04 79-10-7 acrylic acid 0.5 107-05-1 allyl chloride 0.5 C7440-36-0 antimony & compounds as sb 0.5 1309-64-4 antimony trioxide, as sb 0.5 7784-42-1 arsine 0.1 100-44-7 benzyl chloride 0.1 92-52-4 biphenyl 0.5 156-62-7 calcium cyanamide 0.5 105-60-2 caprolactam, dust 0.5 105-60-2 caprolactam, vapor 0.5 133-06-2 captan 0.5 63-25-2 carbaryl 0.5 75-15-0 carbon disulfide 0.5 463-58-1 carbonyl sulfide 0.5 120-80-9 catechol 0.5 7782-50-5 chlorine 0.1 79-11-8 chloroacetic acid 0.1 532-27-4 chloroacetophenone, alpha- 0.06 108-90-7 chlorobenzene 0.5 C7440-47-3 chromium (ii) compounds, as cr 0.5 C7440-47-3 chromium (iii) compounds, cr 0.5 10210-68-1 cobalt carbonyl, as co 0.1 7440-48-4 cobalt, as co metal dust, fume 0.1 1319-77-3 cresols/cresylic acid, (isomers and mixture) 0.5 95-48-7 o-cresol 0.5 108-39-4 m-cresol 0.5 106-44-5 p-cresol 0.5 98-82-8 cumene 0.5 51-12-5 cyanides, as cn 0.5 84-74-2 dibutyl phthalate 0.5 111-42-2 diethanolamine 0.5 60-11-7 dimethyl aminoazobenzene 0.5 121-69-7 dimethylaniline 0.5 68-12-2 dimethylformamide 0.5 131-11-3 dimethylphthalate 0.5 100-41-4 ethyl benzene 0.5 75-00-3 ethyl chloride 0.5 107-21-1 ethylene glycol 0.5 111-76-2 ethylene glycol monobutyl ether 0.5 ——— glycol ethers (except for listed ones) 0.5 77-47-4 hexachlorocyclopentadiene 0.1 822-06-0 hexamethylene, 1, 6-diisocyanate 0.02 110-54-3 hexane (n-hexane) 0.5 110-54-3 hexane, other isomers 0.5 7647-01-0 hydrogen chloride 0.5 7664-39-3 hydrogen fluoride, as f 0.1 123-31-9 hydroquinone 0.5 78-59-1 isophorone 0.5 108-31-6 maleic anhydride 0.5 C7439-96-5 manganese dust & compounds (except listed) 0.5 748-79-4 mercuric chloride 0.01 10045-94-0 mercuric nitrate 0.01 C7439-97-6 mercury, elemental 0.01 72-43-5 methoxychlor 0.5 67-56-1 methyl alcohol 0.5 74-83-9 methyl bromide 0.5 74-87-3 methyl chloride 0.5 71-55-6 methyl chloroform (1, 1, 1-trichloroethane) 0.5 78-93-3 methyl ethyl ketone (mek) 0.5 74-88-4 methyl iodide 0.06 108-10-1 methyl isobutyl ketone 0.5 624-83-9 methyl isocyanate 0.1 80-62-6 methyl methacrylate 0.5 1634-04-4 methyl tert-butyl ether 0.5 12108-13-3 methylcyclopentadienyl manganese tricarbonyl 0.1 101-68-8 methylene bisphenyl isocyanate 0.1 91-20-3 naphthalene 0.5 98-95-3 nitrobenzene 0.5 106-50-3 p-phenylenediamine 0.5 56-38-2 parathion 0.1 108-95-2 phenol 0.1 62-38-4 phenyl mercuric acetate 0.01 75-44-5 phosgene 0.1 7803-51-2 phosphine 0.5 7723-14-0 phosphorus 0.1 85-44-9 phthalic anhydride 0.5 57-57-8 propiolactone, beta- 0.1 123-38-6 propionaldehyde 0.5 114-26-1 propoxur 0.5 106-51-4 quinone 0.5 C7782-49-2 selenium compounds, as se 0.5 7783-79-1 selenium hexafluoride, as se 0.5 7488-56-4 selenium sulfides (mono and di) 0.5 100-42-5 styrene monomer 0.5 78-00-2 tetraethyl lead, as pb 0.01 75-74-1 tetramethyl lead, as pb 0.01 7550-45-0 titanium tetrachloride 0.1 108-88-3 toluene 0.5 121-44-8 triethylamine 0.5 108-05-4 vinyl acetate 0.5 593-60-2 vinyl bromide 0.5 1330-20-7 xylenes (m-,o-,p-isomers) 0.5 79469 2-nitropropane 0.5 540841 2, 2, 4-trimethylpentane 0.5 95954 2, 4, 5-trichlorophenol 0.5 92671 4-aminobiphenyl 0.5 101779 4, 4'-methlenedianiline 0.5 534521 4, 6-dinitro-o-cresol and salts 0.1 60355 acetamide 0.5 1345046 antimony trisulfide 0.1 7783702 antimony pentafluoride 0.1 28300745 antimony potassium tartrate 0.5 133904 chloramben 0.5 ——— chromium compounds, except hexavalent and trivalent 0.5 10025737 chromic chloride 0.1 334883 diazomethane 0.5 64675 diethyl sulfate 0.5 62207765 fluomine 0.1 680319 hexamethylphosphoramide 0.01 12108133 methylcyclopentadienyl manganese 0.1 101688 methylene diphenyl diisocyanate 0.1 69892 N-nitrosomorpholine 0.5 90040 o-anisidine 0.5 ——— polycyclic organic matter 0.01 151508 potassium cyanide 0.1 14339 sodium cyanide 0.1 10102188 sodium selenite 0.1 13410010 sodium selenate 0.1 96093 styrene oxide 0.5
CAS Number
Chemical Name
Threshold Levels
(tons/year)
75-34-3
ethylidene dichloride (1, 1-dichloroethane)
0.5
75-55-8
1, 2 propylenimine (2-methyl aziridine)
0.003
120-82-1
1, 2, 4-trichlorobenzene
0.5
106-88-7
1, 2-epoxybutane
0.5
542-75-6
1, 3-dichloropropene (dichloropropene)
0.5
51-28-5
2, 4-dinitrophenol
0.5
111-76-2
2-butoxyethanol
0.5
110-80-5
2-ethoxyethanol
0.5
109-86-4
2-methoxyethanol
0.5
92-93-3
4-nitrobiphenol
0.5
100-02-7
4-nitrophenol
0.5
75-05-8
acetonitrile
0.5
98-86-2
acetophenone
0.5
107-02-8
acrolein
0.04
79-10-7
acrylic acid
0.5
107-05-1
allyl chloride
0.5
C7440-36-0
antimony & compounds as sb
0.5
1309-64-4
antimony trioxide, as sb
0.5
7784-42-1
arsine
0.1
100-44-7
benzyl chloride
0.1
92-52-4
biphenyl
0.5
156-62-7
calcium cyanamide
0.5
105-60-2
caprolactam, dust
0.5
105-60-2
caprolactam, vapor
0.5
133-06-2
captan
0.5
63-25-2
carbaryl
0.5
75-15-0
carbon disulfide
0.5
463-58-1
carbonyl sulfide
0.5
120-80-9
catechol
0.5
7782-50-5
chlorine
0.1
79-11-8
chloroacetic acid
0.1
532-27-4
chloroacetophenone, alpha-
0.06
108-90-7
chlorobenzene
0.5
C7440-47-3
chromium (ii) compounds, as cr
0.5
C7440-47-3
chromium (iii) compounds, cr
0.5
10210-68-1
cobalt carbonyl, as co
0.1
7440-48-4
cobalt, as co metal dust, fume
0.1
1319-77-3
cresols/cresylic acid, (isomers and mixture)
0.5
95-48-7
o-cresol
0.5
108-39-4
m-cresol
0.5
106-44-5
p-cresol
0.5
98-82-8
cumene
0.5
51-12-5
cyanides, as cn
0.5
84-74-2
dibutyl phthalate
0.5
111-42-2
diethanolamine
0.5
60-11-7
dimethyl aminoazobenzene
0.5
121-69-7
dimethylaniline
0.5
68-12-2
dimethylformamide
0.5
131-11-3
dimethylphthalate
0.5
100-41-4
ethyl benzene
0.5
75-00-3
ethyl chloride
0.5
107-21-1
ethylene glycol
0.5
111-76-2
ethylene glycol monobutyl ether
0.5
———
glycol ethers (except for listed ones)
0.5
77-47-4
hexachlorocyclopentadiene
0.1
822-06-0
hexamethylene, 1, 6-diisocyanate
0.02
110-54-3
hexane (n-hexane)
0.5
110-54-3
hexane, other isomers
0.5
7647-01-0
hydrogen chloride
0.5
7664-39-3
hydrogen fluoride, as f
0.1
123-31-9
hydroquinone
0.5
78-59-1
isophorone
0.5
108-31-6
maleic anhydride
0.5
C7439-96-5
manganese dust & compounds
(except listed)
0.5
748-79-4
mercuric chloride
0.01
10045-94-0
mercuric nitrate
0.01
C7439-97-6
mercury, elemental
0.01
72-43-5
methoxychlor
0.5
67-56-1
methyl alcohol
0.5
74-83-9
methyl bromide
0.5
74-87-3
methyl chloride
0.5
71-55-6
methyl chloroform (1, 1, 1-trichloroethane)
0.5
78-93-3
methyl ethyl ketone (mek)
0.5
74-88-4
methyl iodide
0.06
108-10-1
methyl isobutyl ketone
0.5
624-83-9
methyl isocyanate
0.1
80-62-6
methyl methacrylate
0.5
1634-04-4
methyl tert-butyl ether
0.5
12108-13-3
methylcyclopentadienyl manganese tricarbonyl
0.1
101-68-8
methylene bisphenyl isocyanate
0.1
91-20-3
naphthalene
0.5
98-95-3
nitrobenzene
0.5
106-50-3
p-phenylenediamine
0.5
56-38-2
parathion
0.1
108-95-2
phenol
0.1
62-38-4
phenyl mercuric acetate
0.01
75-44-5
phosgene
0.1
7803-51-2
phosphine
0.5
7723-14-0
phosphorus
0.1
85-44-9
phthalic anhydride
0.5
57-57-8
propiolactone, beta-
0.1
123-38-6
propionaldehyde
0.5
114-26-1
propoxur
0.5
106-51-4
quinone
0.5
C7782-49-2
selenium compounds, as se
0.5
7783-79-1
selenium hexafluoride, as se
0.5
7488-56-4
selenium sulfides (mono and di)
0.5
100-42-5
styrene monomer
0.5
78-00-2
tetraethyl lead, as pb
0.01
75-74-1
tetramethyl lead, as pb
0.01
7550-45-0
titanium tetrachloride
0.1
108-88-3
toluene
0.5
121-44-8
triethylamine
0.5
108-05-4
vinyl acetate
0.5
593-60-2
vinyl bromide
0.5
1330-20-7
xylenes (m-,o-,p-isomers)
0.5
79469
2-nitropropane
0.5
540841
2, 2, 4-trimethylpentane
0.5
95954
2, 4, 5-trichlorophenol
0.5
92671
4-aminobiphenyl
0.5
101779
4, 4'-methlenedianiline
0.5
534521
4, 6-dinitro-o-cresol and salts
0.1
60355
acetamide
0.5
1345046
antimony trisulfide
0.1
7783702
antimony pentafluoride
0.1
28300745
antimony potassium tartrate
0.5
133904
chloramben
0.5
———
chromium compounds, except hexavalent and trivalent
0.5
10025737
chromic chloride
0.1
334883
diazomethane
0.5
64675
diethyl sulfate
0.5
62207765
fluomine
0.1
680319
hexamethylphosphoramide
0.01
12108133
methylcyclopentadienyl manganese
0.1
101688
methylene diphenyl diisocyanate
0.1
69892
N-nitrosomorpholine
0.5
90040
o-anisidine
0.5
———
polycyclic organic matter
0.01
151508
potassium cyanide
0.1
14339
sodium cyanide
0.1
10102188
sodium selenite
0.1
13410010
sodium selenate
0.1
96093
styrene oxide
0.5