Environmental Protection Agency's Class A Carcinogens

The EPA considers Class A carcinogens as pollutants with adequate human data indicating the chemical causes cancer in people. Class B1 carcinogens have some human data and sufficient animal data to indicate its potential to cause cancer. Class B2 carcinogens have limited to no human data, but sufficient animal data to indicate its potential to cause cancer.

The following pollutants in the 1999 Alaska Air Toxics Emission Inventory are ranked as Class A Carcinogens by EPA:

Chemical Name	Inhalation Unit Risk Estimate (µ/m³) -1	Comments
Asbestos (PDF)	0.23	Units are in (fibers/cm³) -1
Chromium VI Particulates (PDF)	0.012	N/A
Bis(chloromethyl)Ether (PDF)	0.062	N/A
Benzidine (PDF)	0.067	N/A
Arsenic Compounds-inorganic including arsine (PDF)	0.0043	N/A
Coke Oven Emissions (PDF)	0.00062	N/A
Vinyl Chloride (PDF)	0.0000088	N/A
Benzene-including benzene from gasoline (PDF)	0.0000022 to 0.000078	N/A
4-Aminobiphenyl (PDF)	N/A	Carcinogenicity ranked "1" by International Agency for Research on Cancer.
Chloromethyl Methyl Ether (PDF)	N/A	Ranking as Class 'A' carcinogen given by EPA. However, no unit risk estimate is available.

The following pollutants in the 1999 Alaska Air Toxics Emission Inventory are ranked as Class B1 carcinogens by the EPA. Class B1 carcinogens have some human data and sufficient animal data to indicate its potential to cause cancer.: Acrylonitrile; Beryllium Compounds; Cadmium Compounds; Diethyl sulfate; Ethylene oxide; Formaldehyde; Styrene oxide; Tetrachloroethylene (Perchloroethylene); Trichloroethylene

The following pollutants in the 1999 Alaska Air Toxics Emission Inventory are ranked as Class B2 carcinogens by the EPA.Class B2 carcinogens have limited to no human data, but sufficient animal data to indicate its potential to cause cancer.: 1,1-Dimethyl Hydrazine; 1,2-Dibromo-3-Chloropropane; 1,2-Diphenylhydrazine; 1,2-Epoxybutane; 1,2-Propyleneimine (2-Methyl Aziridine); 1,3-Butadiene; 1,3-Dichloropropene; 1,3-Propane Sultone; 1,4-Dioxane (1,4-Diethyleneoxide); 2,3,7,8-Tetrachlorodibenzo-p-Dioxin; 2,4,6-Trichlorophenol; 2,4-Dinitrotoluene; 2,4-Toluene Diamine; 2,4-Toluene Diisocyanate; 2-Nitropropane; 3,3-Dichlorobenzidene; 3,3-Dimethoxybenzidine; 3,3-Dimethyl Benzidine; 4,4-Methylene bis (2-Chloroaniline); 4,4'-Methylenedianiline; Acetaldehyde; Acetamide; Acrylamide; Aniline; Benzotricholoride; Benzyl Chloride; beta-Propiolactone; Bis(2-Ethylhexyl)Phthalate (DEHP); Bromoform; Captan; Carbon Tetrachloride; Catechol; Ceramic Fibers; Chlordane; Chlorobenzilate; Chloroform; DDE; Dichloroethyl Ether (Bis[2-Chloroethyl]ether); Dichlorvos; Dimethyl Aminoazobenzene; Dimethyl Sulfate; Epichlorohydrin (1-Chloro-2,3-Epoxypropane); Ethyl Acrylate; Ethyl Carbamate (Urethane); Ethylene Dibromide (Dibromoethane); Ethylene Dichloride (1,2-Dichloroethane); Ethylene Thiourea; Glass wool; Heptachlor; Hexachlorobenzene; Hexamethylphosphoramide; Hydrazine; Lead Compounds; Lindane (all isomers); Methylene Chloride(Dichloromethane); N-Nitrosodimethylamine; N-Nitrosomorpholine; N-Nitroso-N-Methylurea; o-Anisidine; o-Toluidine; Pentachlorophenol; Polychlorinated Biphenyls (Aroclors); Polycylic Organic Matter; Propylene Dichloride (1,2-Dichloropropane); Propylene Oxide; Quinoline; Rockwool and Slagwool; Selenium Sulfide; Toxaphene (chlorinated camphene); Vinyl Bromide

To explore the possible health effects of these and other pollutants, please visit the following internet sites:: The Environmental Protection Agency's Integrated Risk Information System - list of non-cancer and cancer risk values for many pollutants; The Agency for Toxic Substances and Disease Registry - list of pollutants and corresponding minimum risk levels; The National Institutes of Health, National Library of Medicine's Hazardous Substances Data Bank (HSDB); The Environmental Protection Agency's Health Effects Notebook for Hazardous Air Pollutants; The Agency for Toxic Substances and Disease Registry's Frequently Asked Questions about contaminants found at Hazardous Waste Sites

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