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This page last reviewed July 15, 2008
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Toxic Air Contaminant (TAC) Identification
List
|
|
December 1999
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|
Substance By Category
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Click on the ++ to view its chemical summary from the
Office of Environmental Health Hazard and Assessment website.
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Category I
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|
Substances identified as Toxic Air
Contaminants, known to be emitted in California, with a full set of
health values reviewed by the Scientific Review Panel.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
Click on the ++ to view its chemical
summary from the Office of Environmental Health Hazard
and Assessment website.
|
|
Substance
|
CAS
Number
|
Cancer
Potency
Value
|
Chronic
Reference
Exposure Level
|
Acute Reference
Exposure Level
|
|
*
|
Perchloroethylene (Tetrachloroethylene) |
127-18-4
|
++
|
++
|
++
|
| |
(There is a potential for 12 substances to move into this category after
the SRP has reviewed the noncancer chronic Reference Exposure Levels being developed under the Air Toxics "Hot
Spots" Program.) |
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|
|
|
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Category
IIa
|
|
Substances identified as Toxic Air
Contaminants, known to be emitted in California, with one or more
health values under development by the Office of Environmental Health Hazard Assessment for
review by the Scientific Review Panel.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
Click on the ++ to view its chemical
summary from the Office of Environmental Health Hazard
and Assessment website.
|
|
Substance
|
CAS
Number
|
Cancer
Potency
Value
(Note 1)
|
Chronic
Reference
Exposure Level
(Note 2)
|
Acute Reference
Exposure Level
(Note 3)
|
| |
Acetaldehyde |
75-07-0
|
++
|
++
|
Limited Data Available
|
| |
Acetamide |
60-35-5
|
++
|
Limited Data Available
|
Limited Data Available
|
|
+
|
Acrolein |
107-02-8
|
i (Note
1)
|
X
|
++
|
| |
Acrylamide |
79-06-1
|
++
|
X
|
Limited Data Available
|
| |
Acrylic Acid |
79-10-7
|
ii (Note
1)
|
X
|
++
|
| |
Acrylonitrile |
107-13-1
|
++
|
X
|
Limited Data Available
|
| |
Allyl Chloride |
107-05-1
|
++
|
X
|
Limited Data Available
|
| |
Aniline |
62-53-3
|
++
|
X
|
Limited Data Available
|
| |
Antimony and Compounds (Note
4) |
7440-36-0
|
ii (Note
1)
|
Limited Data Available
|
Limited Data Available
|
| |
Antimony Trioxide |
1309-64-4
|
i (Note
1)
|
X
|
Limited Data Available
|
|
*+
|
Inorganic Arsenic and Arsenic Compounds
(Inoganic Including Arsine) (Note 4) |
7440-38-2
|
++
|
X
|
++
|
| |
Arsine |
7784-42-1
|
ii (Note
1)
|
X
|
++
|
|
*
|
Asbestos [Asbestiform Varieties of Serpentine (Chrysotile), Riebeckite (Crocidolite),
Cummingtonite-Grunerite (Amosite), Tremolite, Actinolite, and Anthophyllite] |
1332-21-4
|
++
|
Limited Data Available
|
Limited Data Available
|
|
*
|
Benzene (Including Benzene from Gasoline) |
71-43-2
|
++
|
X
|
++
|
| |
Benzyl Chloride |
100-44-7
|
++
|
Limited Data Available
|
++
|
| |
Beryllium and Compounds (Note
4) |
7440-41-7
|
++
|
X
|
Limited Data Available
|
| |
Bis(Chloromethyl)Ether |
542-88-1
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Bis(2-Ethylhexyl)Phthalate (DEHP) |
117-81-7
|
++
|
X
|
Limited Data Available
|
|
*
|
1,3-Butadiene |
106-99-0
|
++
|
X
|
Limited Data Available
|
|
*
|
Cadmium and Compounds (Note
4)
(Metallic Cadmium and Cadmium Compounds) |
7440-43-9
|
++
|
X
|
Limited Data Available
|
| |
Carbon Disulfide |
75-15-0
|
ii
(Note 1)
|
X
|
++
|
|
*
|
Carbon Tetrachloride (Tetrachloromethane) |
56-23-5
|
++
|
X
|
++
|
|
*
|
Chlorinated Dibenzo-P-Dioxins (Note
5) |
N/A
|
++
|
X
|
Limited Data Available
|
| |
2,3,7,8-Tetrachlorodibenzo-P-Dioxin |
1746-01-6
|
++
|
X
|
Limited Data Available
|
| |
International Toxicity Equivalency Factors: |
|
|
|
|
| |
1,2,3,4,6,7,8-Heptachlorodibenzo-P-Dioxin |
35822-46-9
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,4,7,8-Hexachlorodibenzo-P-Dioxin |
39227-28-6
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,6,7,8-Hexachlorodibenzo-P-Dioxin |
57653-85-7
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,7,8,9-Hexachlorodibenzo-P-Dioxin |
19408-74-3
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,4,6,7,8,9-Octachlorodibenzo-P-Dioxin |
3268-87-9
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,7,8-Pentachlorodibenzo-P-Dioxin |
40321-76-4
|
++
|
X
|
Limited Data Available
|
|
*
|
Chlorinated Dibenzofurans (Note
5) |
N/A
|
++
|
X
|
Limited Data Available
|
|
|
International Toxicity Equivalency Factors: |
|
|
|
|
| |
2,3,7,8-Tetrachlorodibenzofuran |
5120-73-19
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,4,7,8-Hexachlorodibenzofuran |
70648-26-9
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,6,7,8-Hexachlorodibenzofuran |
57117-44-9
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,7,8,9-Hexachlorodibenzofuran |
72918-21-9
|
++
|
X
|
Limited Data Available
|
| |
2,3,4,6,7,8-Hexachlorodibenzofuran |
60851-34-5
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,4,6,7,8-Heptachlorodibenzofuran |
67562-39-4
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,4,7,8,9-Heptachlorodibenzofuran |
55673-89-7
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,4,6,7,8,9-Octachlorodibenzofuran |
39001-02-0
|
++
|
X
|
Limited Data Available
|
| |
1,2,3,7,8-Pentachlorodibenzofuran |
57117-41-6
|
++
|
X
|
Limited Data Available
|
| |
2,3,4,7,8-Pentachlorodibenzofuran |
57117-31-4
|
++
|
X
|
Limited Data Available
|
|
+
|
Chlorine |
7782-50-5
|
ii (Note
1)
|
X
|
++
|
| |
Chlorobenzene |
108-90-7
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
*
|
Chloroform |
67-66-3
|
++
|
X
|
++
|
|
+
|
Chromium and Compounds (Note
4) |
7440-47-3
|
ii (Note
1)
|
Limited Data Available
|
Limited Data Available
|
|
*
|
Chromium (VI) |
18540-29-9
|
++
|
X
|
Limited Data Available
|
| |
Cobalt and Compounds (Note
4) |
7440-48-4
|
i (Note
1)
|
X
|
Limited Data Available
|
| |
Cresols / Cresylic Acid (Isomers and Mixture) |
1319-77-3
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
+
|
Cyanide Compounds (Notes
4 and 11) |
57-12-5
|
ii (Note
1)
|
Limited Data Available
|
++
|
|
+
|
1,4-Dichlorobenzene |
106-46-7
|
++
|
X
|
Limited Data Available
|
| |
3,3-Dichlorobenzidene |
91-94-1
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Diethanolamine |
111-42-2
|
ii (Note
1 and 6)
|
X
|
Limited Data Available
|
| |
Dimethyl Formamide |
68-12-2
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
1,4-Dioxane (1,4-Diethyleneoxide) |
123-91-1
|
++
|
X
|
++
|
| |
Epichlorohydrin (1-Chloro-2,3-Epoxypropane) |
106-89-8
|
++
|
X
|
++
|
| |
1,2-Epoxybutane |
106-88-7
|
i (Note
1)
|
X
|
Limited Data Available
|
| |
Ethyl Benzene |
100-41-4
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Ethyl Carbamate (Urethane) |
51-79-6
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Ethyl Chloride (Chloroethane) |
75-00-3
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
*
|
Ethylene Dibromide (1,2-Dibromoethane) |
106-93-4
|
++
|
X
|
Limited Data Available
|
|
*
|
Ethylene Dichloride (1,2-Dichloroethane) |
107-06-2
|
++
|
X
|
Limited Data Available
|
| |
Ethylene Glycol |
107-21-1
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
*+
|
Ethylene Oxide (1,2-Epoxyethane) |
75-21-8
|
++
|
X
|
Limited Data Available
|
| |
Ethylene Thiourea |
96-45-7
|
++
|
X
|
Limited Data Available
|
| |
Ethylidene Dichloride (1,1-Dichloroethane) |
75-34-3
|
++
|
Limited Data Available
|
Limited Data Available
|
|
*+
|
Formaldehyde |
50-00-0
|
++
|
X
|
++
|
| |
Glycol Ethers (Note
4 and 7) |
N/A
|
ii (Note
1)
|
X
|
++
|
|
+
|
Ethylene Glycol Monobutyl Ether |
111-76-2
|
ii (Note
1)
|
X
|
++
|
| |
Ethylene Glycol Monoethyl Ether |
110-80-5
|
ii (Note
1)
|
X
|
++
|
| |
Ethylene Glycol Monoethyl Ether Acetate |
111-15-9
|
ii (Note
1)
|
X
|
++
|
| |
Ethylene Glycol Monomethyl Ether |
109-86-4
|
ii (Note
1)
|
X
|
++
|
| |
Ethylene Glycol Monomethyl Ether Acetate |
110-49-6
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Hexachlorobenzene |
118-74-1
|
++
|
X
|
Limited Data Available
|
| |
Hexachloroethane |
67-72-1
|
i (Note
1)
|
X
|
Limited Data Available
|
| |
Hexamethylene-1,6-diisocyanate |
822-06-0
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Hexane |
110-54-3
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Hydrazine |
302-01-2
|
++
|
X
|
Limited Data Available
|
|
+
|
Hydrochloric Acid |
7647-01-0
|
ii (Note
1)
|
X
|
++
|
| |
Hydrogen Aluoride (Hydrofluoric Acid) |
7664-39-3
|
ii (Note
1)
|
X
|
++
|
| |
Isophorone |
78-59-1
|
i (Note
1)
|
X
|
Limited Data Available
|
|
*
|
Inorganic Lead and Inorganic Lead Compounds
(Includes Elemental Lead) (Note 4) |
N/A
|
++
|
Limited Data Available
(Note 8)
|
Limited Data Available
|
| |
Lead Compounds (Does Not Include
Elemental Lead) (Note 4) |
7439-92-1
|
i (Note
1)
|
Limited Data Available
|
Limited Data Available
|
|
+
|
Lindane |
58-89-9
|
++
|
X
|
Limited Data Available
|
| |
Maleic Anhydride |
108-31-6
|
ii
(Note 1)
|
X
|
Limited Data Available
|
|
+
|
Manganese and Compounds (Note
4) |
7439-96-5
|
ii
(Note 1)
|
X
|
Limited Data Available
|
| |
Mercury and Compounds (Note
4) |
7439-97-6
|
ii
(Note 1)
|
X
|
++
|
| |
Mercuric Chloride |
7487-94-7
|
i (Note
1)
|
Limited Data Available
|
Limited Data Available
|
|
+
|
Methanol |
67-56-1
|
ii (Note
1)
|
X
|
++
|
|
+
|
Methyl Bromide (Bromomethane) |
74-83-9
|
ii (Note
1)
|
X
|
++
|
| |
Methyl Chloroform (1,1,1-Trichloroethane) |
71-55-6
|
ii (Note
1)
|
X
|
++
|
| |
Methyl Ethyl Ketone (2-Butanone) |
78-93-3
|
ii (Note
1)
|
X
|
++
|
| |
Methyl Isocyanate |
624-83-9
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Methyl Methacrylate |
80-62-6
|
iii (Note
1)
|
X
|
Limited Data Available
|
|
0
|
Methyl Tertiary Butyl Ether |
1634-04-4
|
++
|
(Note 15)
|
Limited Data Available
|
| |
4,4-Methylene Bis(2-Chloroaniline) |
101-14-4
|
++
|
Limited Data Available
|
Limited Data Available
|
|
*
|
Methylene Chloride (Dichloromethane) |
75-09-2
|
++
|
X
|
++
|
| |
4,4-Methylenedianiline |
101-77-9
|
++
|
X
|
Limited Data Available
|
| |
Methylene Diphenyl Diisocyanate |
101-68-8
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Naphthalene |
91-20-3
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
*
|
Nickel and Compounds (Note
4)
(Metallic Nickel and Inorganic Nickel Compounds) |
7440-02-0
|
++
|
X
|
++
|
| |
Nitrobenzene |
98-95-3
|
i (Note
1)
|
X
|
Limited Data Available
|
| |
2-Nitropropane |
79-46-9
|
i (Note
1)
|
X
|
Limited Data Available
|
| |
N-Nitrosodimethylamine |
62-75-9
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
N-Nitrosomorpholine |
59-89-2
|
++
|
Limited Data Available
|
Limited Data Available
|
|
*
|
Particulate Emissions from Diesel-Fueled Engines |
N/A
|
++
|
++
|
Limited Data Available
|
|
+
|
Pentachlorophenol |
87-86-5
|
++
|
X
|
Limited Data Available
|
| |
Phenol |
108-95-2
|
ii (Note
1)
|
X
|
++
|
| |
Phosgene |
75-44-5
|
ii (Note
1)
|
X
|
++
|
| |
Phosphine |
7803-51-2
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
+
|
Phosphorus |
7723-14-0
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Phthalic Anhydride |
85-44-9
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Polychlorinated Biphenyls (Aroclors) |
1336-36-3
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Polycyclic Organic Matter (Note
9) |
|
|
|
|
| |
Polycyclic Aromatic Hydrocarbon (PAH) |
|
|
|
|
| |
Including but not limited to: |
|
|
|
|
| |
Benzo[a]pyrene (Note
10) |
50-32-8
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Potency Equivalency Factors for PAHs and
PAH-Derivatives (Note 10) |
|
|
|
|
| |
Benz[a]anthracene |
56-55-3
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Benzo[b]fluoranthene |
205-99-2
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Benzo[j]fluoranthene |
205-82-3
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Benzo[k]fluoranthene |
207-08-9
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Chrysene |
218-01-9
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenz[a,h]acridine |
226-36-8
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenz[a,j]acridine |
224-42-0
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenz[a,h]anthracene |
53-70-3
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenzo[a,e]pyrene |
192-65-4
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenzo[a,h]pyrene |
189-64-0
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenzo[a,i]pyrene |
189-55-9
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Dibenzo[a,l]pyrene |
191-30-0
|
++
|
Limited Data Available
|
No Data
Available
|
| |
7H-Dibenzo[c,g]carbazole |
194-59-2
|
++
|
Limited Data Available
|
No Data
Available
|
| |
7,12-Dimethylbenz[a]anthracene |
57-97-6
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
1,6-Dinitropyrene |
4239-76-48
|
++
|
Limited Data Available
|
No Data
Available
|
| |
1,8-Dinitropyrene |
4239-76-59
|
++
|
Limited Data Available
|
No Data
Available
|
| |
Indeno[1,2,3-Cd]Pyrene |
193-39-5
|
++
|
Limited Data Available
|
No Data
Available
|
| |
3-Methylcholanthrene |
56-49-5
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
5-Methylchrysene |
3697-24-3
|
++
|
Limited Data Available
|
No Data
Available
|
| |
5-Nitroacenaphthene |
602-87-9
|
++
|
Limited Data Available
|
No Data
Available
|
| |
6-Nitrochrysene |
7496-02-8
|
++
|
Limited Data Available
|
No Data
Available
|
| |
2-Nitrofluorene |
607-57-8
|
++
|
Limited Data Available
|
No Data
Available
|
| |
1-Nitropyrene |
5522-43-0
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
4-Nitropyrene |
57835-92-4
|
++
|
Limited Data Available
|
No Data
Available
|
| |
1,3-Propane Sultone |
1120-71-4
|
++
|
Limited Data Available
|
Limited Data Available
|
|
+
|
Propylene Oxide |
75-56-9
|
++
|
X
|
++
|
| |
Selenium and Compounds (Note
4) |
7782-49-2
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Hydrogen Selenide |
7783-07-5
|
ii (Note
1)
|
X
|
++
|
|
0
|
Styrene |
100-42-5
|
i (Note
1)
|
X
|
++
|
| |
Styrene Oxide |
96-09-3
|
i (Note
1)
|
X
|
Limited Data Available
|
| |
1,1,2,2-Tetrachloroethane |
79-34-5
|
++
|
X
|
Limited Data Available
|
| |
Toluene |
108-88-3
|
ii (Note
1)
|
X
|
++
|
| |
Toluene-2,4-Diisocyanate |
584-84-9
|
++
|
X
|
Limited Data Available
|
| |
1,1,2-Trichloroethane |
79-00-5
|
++
|
X
|
Limited Data Available
|
|
*
|
Trichloroethylene |
79-01-6
|
++
|
X
|
Limited Data Available
|
| |
2,4,6-Trichlorophenol |
88-06-2
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Triethylamine |
121-44-8
|
ii (Note
1)
|
X
|
++
|
| |
Vinyl Ccetate |
108-05-4
|
i (Note
1)
|
X
|
Limited Data Available
|
|
*
|
Vinyl Chloride (Chloroethylene) |
75-01-4
|
++
|
X
|
++
|
| |
Vinylidene Chloride (1,1-Dichloroethylene) |
75-35-4
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
+
|
Xylenes (Mixed Isomers) |
1330-20-7
|
ii
(Note 1)
|
X
|
++
|
| |
M-Xylene |
108-38-3
|
ii (Note
1)
|
X
|
++
|
| |
O-Xylene |
95-47-6
|
ii (Note
1)
|
X
|
++
|
| |
P-Xylene |
106-42-3
|
ii (Note
1)
|
X
|
++
|
|
Category
IIb
|
|
Substances NOT identified as Toxic
Air Contaminants, known to be emitted in California, with one or more
health values under development by the Office of Environmental Health Hazard Assessment for
review by the Scientific Review Panel.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
Click on the ++ to view its chemical
summary from the Office of Environmental Health Hazard
and Assessment website.
|
|
Substance
|
CAS
Number
|
Cancer
Potency
Value
(Note 1)
|
Chronic
Reference
Exposure Level
(Note 2)
|
Acute Reference
Exposure Level
(Note 3)
|
| |
Ammonia |
7664-41-7
|
ii (Note
1)
|
X
|
++
|
|
+
|
Chlorine Dioxide |
10049-04-4
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
+
|
Chloropicrin |
76-06-2
|
ii (Note
1)
|
X
|
++
|
|
+
|
Copper and Compounds (Note
4) |
7440-50-8
|
ii (Note
1)
|
Limited Data Available
|
++
|
|
+
|
Creosotes |
N/A
|
i (Note
1)
|
Limited Data Available
|
Limited Data Available
|
|
+
|
Ethylene |
74-85-1
|
ii (Note
1)
|
X
|
Limited Data Aavailable
|
|
+
|
Glutaraldehyde |
111-30-8
|
ii (Note
1)
|
X
|
Limited Data Available
|
| |
Hexachlorocyclohexanes |
608-73-1
|
++
|
X
|
Limited Aata Available
|
| |
Hydrogen Sulfide |
7783-06-4
|
ii (Note
1)
|
X
|
++
|
|
+
|
Isopropyl Alcohol |
67-63-0
|
ii (Note
1)
|
X
|
++
|
| |
Michler's Ketone (4,4'-Bis(Dimethylamino)Benzophenone) |
90-94-8
|
++
|
Limited Data Available
|
Limited Data Available
|
| |
Nitric Ccid |
7697-37-2
|
ii (Note
1)
|
X
|
++
|
|
+
|
Phosphoric Acid |
7664-38-2
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
+
|
Silver and Compounds (Note
4) |
7440-22-4
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
+
|
Sodium Cydroxide |
1310-73-2
|
ii (Note
1)
|
X
|
++
|
|
+
|
Sulfuric Acid |
7664-93-9
|
ii (Note
1)
|
X
|
++
|
|
+
|
Zinc and Compounds (Note
4) |
7440-66-6
|
ii (Note
1)
|
X
|
Limited Data Available
|
|
Category
III
|
|
Substances known to be emitted in California
and are NOMINATED for development of
health values or additional health values.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
|
|
Category IIIa
|
|
Category IIIb
|
|
|
Identified as Toxic Air Contaminants
|
|
Not Identified as Toxic
Air Contaminants
|
|
|
Substance
|
CAS
Number
|
Substance
|
CAS
Number
|
| |
Methyl Tertiary Butyl Ether (Note
15) (Substance also in Category IIa) |
1634-04-4
|
Crystalline Silica
|
7631-86-9
|
| |
Polycyclic Organic Matter (Note
9)
Other PAHs and Nitro-PAHs not listed in Category IIa or IVa.
(Specific PAHs still to be determined.) |
N/A
|
|
|
| |
Styrene (Substance also in Category IIa.) |
100-42-5
|
|
|
|
Category
IVa
|
|
Substance identified as Toxic Air Contaminants,
known to be emitted in California and are
TO BE EVALUATED for entry into Category III.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
|
|
Substance
|
CAS
Number
|
Substance
|
CAS
Number
|
| |
Acetonitrile |
75-05-8
|
|
Hydroquinone |
123-31-9
|
| |
Acetophenone |
98-86-2
|
|
Methyl Chloride (Chloromethane) |
74-87-3
|
| |
O-Anisidine |
90-04-0
|
|
Methyl Hydrazine |
60-34-4
|
| |
Biphenyl |
92-52-4
|
|
Methyl Isobutyl Ketone (Hexone) |
108-10-1
|
| |
Carbonyl Sulfide |
463-58-1
|
+
|
Pentachloronitrobenzene (Quintobenzene) |
82-68-8
|
| |
Catechol |
120-80-9
|
|
P-Phenylenediamine |
106-50-3
|
| |
Chloroacetic Acid |
79-11-8
|
|
Polycyclic Organic Matter (POM) (Note 9) |
N/A
|
| |
Chlorobenzilate |
510-15-6
|
|
Other POMs not listed in Category IIa or III
including but not limited to: |
|
| |
Chloroprene |
126-99-8
|
| |
Cumene |
98-82-8
|
|
Anthracene |
120-12-7
|
| |
Dibenzofuran |
132-64-9
|
|
Propionaldehyde |
123-38-6
|
| |
Dibutylphthalate |
84-74-2
|
|
Propylene Dichloride |
78-87-5
|
|
+
|
1,3-Dichloropropene (Telone) |
542-75-6
|
|
1,2-Propylenimine (2-Methyl Aziridine) |
75-55-8
|
| |
1,1-Dimethyl Hydrazine |
57-14-7
|
|
Radionuclides (Including Radon) (Note 12) |
N/A
|
| |
Dimethyl Phthalate |
131-11-3
|
|
Titanium Tetrachloride |
7550-45-0
|
| |
Dimethyl Sulfate |
77-78-1
|
|
1,2,4-Trichlorobenzene |
120-82-1
|
| |
Ethyl Acrylate |
140-88-5
|
|
2,2,4-Trimethylpentane |
540-84-1
|
| |
Fine Mineral Fibers (Note
13) |
N/A
|
|
|
|
|
Category
IVba
|
|
Substance NOT identified as Toxic Air
Contaminants, known to be emitted in California and are
TO BE EVALUATED for entry into Category III.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
|
|
Substance
|
CAS
Number
|
Substance
|
CAS
Number
|
|
+
|
Aluminum and Compounds (Note
4) |
7429-90-5
|
|
Cyclohexane |
110-82-7
|
| |
Ammonium Nitrate |
6484-52-2
|
|
Decabromodiphenyl Oxide |
1163-19-5
|
| |
Ammonium Sulfate |
7783-20-2
|
|
Dialkylnitrosamines |
N/A
|
| |
Barium and Compounds (Note
4) |
7440-39-3
|
|
Diaminotoluene (Mixed Isomers) |
N/A
|
| |
Benzoyl Chloride |
98-88-4
|
|
Dicofol |
115-32-2
|
| |
Bis(2-Ethylhexyl)Adipate |
103-23-1
|
|
Environmental Tobacco Smoke (Note
14) |
N/A
|
| |
Bromine and Compounds (Inorganic) (Note 4) |
7726-95-6
|
|
Gasoline Vapors |
N/A
|
| |
Butyl Acrylate |
141-32-2
|
|
4,4'-Isopropylidenediphenol |
80-05-7
|
|
+
|
N-Butyl Alcohol |
71-36-3
|
|
Molybdenum Trioxide |
1313-27-5
|
| |
Sec-Butyl Alcohol |
78-92-2
|
|
Nitrilotriacetic Acid |
139-13-9
|
| |
Tert-Butyl Alcohol |
75-65-0
|
|
Peracetic Acid |
79-21-0
|
| |
Butyl Benzyl Bhthalate |
85-68-7
|
+
|
2-Phenylphenol |
90-43-7
|
| |
Carbon Black and Carbon Black Extracts |
1333-86-4
|
|
Propene |
115-07-1
|
| |
Chlorinated Fluorocarbons |
N/A
|
|
Terephthalic Acid |
100-21-0
|
| |
Chlorophenols |
N/A
|
|
Thiourea |
62-56-6
|
| |
Cumene Hydroperoxide |
80-15-9
|
|
1,2,4-Trimethylbenzene |
95-63-6
|
|
Category V
|
|
Substance identified as Toxic Air Contaminants,
and NOT KNOWN TO BE EMITTED from stationary source
facilities in California based on information from the AB 2588 Air Toxic "Hot Spots" Program
and the California Toxic Release Inventory.
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
|
|
Substance
|
CAS
Number
|
Substance
|
CAS
Number
|
| |
2-Acetylaminofluorene |
53-96-3
|
|
3,3-Dimethyl Benzidine |
119-93-7
|
| |
4-Aminobiphenyl |
92-67-1
|
|
Dimethyl Carbamoyl Chloride |
79-44-7
|
| |
Benzidine |
92-87-5
|
|
2,4-Dinitrophenol |
51-28-5
|
| |
Benzotrichloride |
98-07-7
|
|
2,4-Dinitrotoluene |
121-14-2
|
| |
Bromoform |
75-25-2
|
|
1,2-Diphenylhydrazine |
122-66-7
|
| |
Calcium Cyanamide |
156-62-7
|
|
Ethylene Imine (Aziridine) |
151-56-4
|
| |
Caprolactam |
105-60-2
|
|
Heptachlor |
76-44-8
|
| |
Chloramben |
133-90-4
|
|
Hexachlorobutadiene |
87-68-3
|
| |
Chlordane |
57-74-9
|
|
Hexachlorocyclopentadiene |
77-47-4
|
| |
2-Chloroacetophenone |
532-27-4
|
|
Hexamethylphosphoramide |
680-31-9
|
| |
Chloromethyl Methyl Ether |
107-30-2
|
|
Methyl Iodide (Iodomethane) |
74-88-4
|
| |
Coke Oven Emissions |
N/A
|
|
4-Nitrobiphenyl |
92-93-3
|
| |
O-Cresol |
95-48-7
|
|
4-Nitrophenol |
100-02-7
|
| |
P-Cresol |
106-44-5
|
|
N-Nitroso-N-Methylurea |
684-93-5
|
| |
DDE (P,P-Dichlorodiphenyldichloroethylene) |
72-55-9
|
|
Parathion |
56-38-2
|
| |
Diazomethane |
334-88-3
|
|
Beta-Propiolactone |
57-57-8
|
| |
1,2-Dibromo-3-Chloropropane |
96-12-8
|
|
Quinoline |
91-22-5
|
| |
Dichloroethyl Ether (Bis(2-Chloroethyl)Ether) |
111-44-4
|
|
Quinone |
106-51-4
|
| |
2,4-Toluene Diamine |
95-80-7
|
| |
N,N-Diethyl Aniline (N,N-Dimethyl Aniline) |
121-69-7
|
|
O-Toluidine |
95-53-4
|
| |
Diethyl Sulfate |
64-67-5
|
|
Toxaphene (Chlorinated Camphene) |
8001-35-2
|
| |
3,3-Dimethoxybenzidine |
119-90-4
|
|
2,4,5-Trichlorophenol |
95-95-4
|
| |
4-Dimethyl Aminoazobenzene |
60-11-7
|
|
Vinyl Bromide |
593-60-2
|
|
Category
VI
|
|
Substances identified as Toxic Air
Contaminants, NOT KNOWN TO BE EMITTED from stationary source
facilities in California, and are active ingredients in pesticides in California.
|
|
For futher information regarding the
pesticidal uses of these compounds,
please contact the Department of Pesticide Regulation
|
|
Click on a substance name to view its
fact sheet from the 1997 Toxic Air Contaminant
Identification List Summaries.
Please note some of the health values have changed since 1997.
|
|
Substance
|
CAS
Number
|
Substance
|
CAS
Number
|
|
+
|
Captan |
133-06-2
|
+
|
Dichlorvos |
62-73-7
|
|
+
|
Carbaryl |
63-25-2
|
+
|
Methoxychlor |
72-43-5
|
|
+
|
M-Cresol |
108-39-4
|
+
|
Propoxur (Baygon) |
114-26-1
|
|
+
|
2,4-D, Salts and Esters (2,4-Dichlorophenoxyacetic Acid) |
94-75-7
|
+
|
Trifluralin |
1582-09-8
|
|
Footnotes
|
|
*
|
Substances which have already been identified by the Air Resources Board
as Toxic Air Contaminants through a
comprehensive AB 1807 risk assessment and which have health values developed by the Office of Environmental
Health Hazard Assessment and approved by the Scientific Review Panel. A full risk assessment report is available. |
|
**
|
AB 1807, Statutes 1983, chapter 1047, Health & Safety Code sections
39650 et. seq.
AB 2728, Statutes 1992, chapter 1161, Health & Safety Code sections 39655 et. seq. |
|
a
|
To be listed as a Toxic Air Contaminant, these substances will go though
a comprehensive AB 1807
risk assessment. |
|
++
|
Health value reviewed by the Scientific Review Panel. |
|
X
|
Health value under development by the Office of Environmental Health Hazard
Assessment for review by the Scientific Review Panel. |
|
0
|
These substances have been nominated for the development of additional health
values. |
|
+
|
These substances are active ingredients in pesticides in California. For
further information regarding the
esticidal uses of these compounds, please contact the Department of Pesticide Regulation. |
|
Note 1:
|
Substances in Category IIa and IIb without a draft or Scientific Review
Panel reviewed Cancer Potency Value
have been divided into 3 groups depending on their cancer classification by the U.S. Environmental Protection Agency (U.S. EPA)
or the International Agency for Research on Cancer (IARC).
|
i
|
Classified by U.S. EPA and / or IARC as a probable or possible human carcinogen
(Group B1, B2, C, 2A, or 2B substances); |
|
ii
|
Classified by U.S. EPA and / or IARC as insufficient/inadequate data exist
to classify
as to carcinogenicity to humans (Group 3 or D substances), or no data or value available
at this time; |
|
iii
|
Considered not likely to be carcinogenic to humans by U.S. EPA and / or
IARC
(Group 4 or E substances). |
|
|
Note 2:
|
The literature was reviewed for substances in Category IIa & IIb without
a draft or Scientific Review Panel reviewed Chronic Reference Exposure Level. "Limited data available"
was added to the row if some chronic toxicity data was found in the literature. "No data
available" was added to the row if no chronic toxicity data
was found in the literature. |
|
Note 3:
|
The literature was reviewed for substances in Category IIa & IIb without
a draft or Scientific Review Panel reviewed Acute Reference Exposure Level. "Limited data available"
was added to the row if some acute toxicity data was found in the literature. "No data available"
was added to the row if no acute toxicity data
was found in the literature. |
|
Note 4:
|
For all listings above which contain the word "compounds" and
for glycol ethers, the following applies:
Unless otherwise specified, these listings are defined as including any unique chemical substance
that contains the named chemical (i.e, antimony, arsenic, etc.) as part of that chemical’s infrastructure. |
|
Note 5:
|
Chlorinated Dibenzo-P-Dioxins and Dibenzofurans:
The cancer potency value for
2,3,7,8-tetrachlorodibenzo-p-dioxin
was determined for the identification of chlorinated dioxins and
dibenzofurans as toxic air contaminants in 1986. At that time, the Board identified dibenzo-p-dioxins and
dibenzofurans chlorinated in the 2,3,7, and 8 positions and containing 4,5,6, or 7 chlorine atoms as toxic
air contaminants. Since 1986, International Toxicity Equivalency Factors (ITEFs) have been developed
which are used to evaluate the cancer risk due to exposure to samples containing mixtures of chlorinated
dibenzo-p-dioxins
and dibenzofurans. ITEFs are numerical factors that express the toxicity of an individual
chlorinated dibenzo-p-dioxin
or dibenzofuran relative to the toxicity of 2,3,7,8-tetrachlorodibenzo-p-dioxin.
ITEFs are listed for 16 chlorinated dibenzo-p-dioxins and dibenzofurans. |
|
Note 6:
|
Diethanolamine: There
is a 1997 draft report by the National Toxicology Program that shows evidence of
carcinogenic activity in mice. (This may result in a change of the cancer classification.) |
|
Note 7:
|
Glycol Ethers: Includes
mono- and di-ethers of ethylene glycol, diethylene glycol, and triethylene glycol
(R(OCH2CH2)n - OR' where
n = 1,2 or 3
R = Alkyl or Aryl Groups
R' = R,H, or Groups Which, When Removed, Yield Glycol Ethers with the
Structure;
R (OCH2CH)n - OH. Polymers are excluded from the glycol category.
|
|
Note 8:
|
Inorganic Lead: Due
to information on non-cancer health effects showing no identified threshold, no
Reference Exposure Level has been developed. However, guidelines for assessing noncancer health
impacts are currently being developed by ARB staff. |
|
Note 9:
|
Polycyclic Organic Matter:
Includes organic compounds with more than one benzene ring, and which
have a boiling point greater than or equal to 100 oC. |
|
Note 10:
|
Benzo[a]pyrene: Potency
Equivalency Factors (PEF) have been developed for 24 polycyclic aromatic
hydrocarbons (PAHs). Using benzo[a]pyrene as a reference compound, a weighting scheme for PAHs
was developed in the 1994 Air Resources Board document entitled, Benzo[a]pyrene
as a Toxic Air
Contaminant. When a specific potency value is developed for a
chemical, it should be used in place
of the PEF. |
|
Note 11:
|
Cyanide Compounds:
X'CN where X=H' or any other group where a formal dissociation may occur.
For example, KCN or Ca(CN)2... |
|
Note 12:
|
Radionuclides: A type
of atom which spontaneously undergoes radioactive decay. |
|
Note 13:
|
Fine Mineral Fibers:
Includes mineral fiber emissions from facilities manufacturing or processing glass,
rock, or slag fibers (or other mineral derived fibers) of average diameter 1 micrometer or less. |
|
Note 14:
|
Environmental Tobacco Smoke:
An AB 1807-type of health assessment for Environmental Tobacco Smoke
was conducted by the Office of Environmental Health Hazard Assessment (OEHHA) and was approved by
the Scientific Review Panel on June 19, 1997. The Air Resources Board accepted the report from OEHHA
on October 23, 1997 and subsequently forwarded to the Department of Health Services’ Tobacco Control
Program for appropriate action. |
|
Note 15:
|
The OEHHA completed its inhalation cancer potency risk assessment on MTBE
and the Scientific Review
Panel approved it at its November 1999 meeting. |
Quick Reference Format
Final
Staff Report
1997 TAC
Fact Sheets
|
