40 CFR Part 63, Table 21
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
You must use the information listed in the following table to determine which emission limit in the HAP constituent options in Tables 1 through 3 to this subpart is applicable to you:
| CAS No. | Selected hazardous air pollutants |
|---|---|
| 50000 | Formaldehyde |
| 51796 | Ethyl carbamate (Urethane) |
| 53963 | 2-Acetylaminofluorene |
| 56235 | Carbon tetrachloride |
| 57147 | 1,1-Dimethyl hydrazine |
| 57578 | beta-Propiolactone |
| 58899 | Lindane (all isomers) |
| 59892 | N-Nitrosomorpholine |
| 60117 | Dimethyl aminoazobenzene |
| 62759 | N-Nitrosodimethylamine |
| 64675 | Diethyl sulfate |
| 67663 | Chloroform |
| 67721 | Hexachloroethane |
| 71432 | Benzene (including benzene from gasoline) |
| 75014 | Vinyl chloride |
| 75070 | Acetaldehyde |
| 75092 | Methylene chloride (Dichloromethane) |
| 75218 | Ethylene oxide |
| 75558 | 1,2-Propylenimine (2-Methyl aziridine) |
| 75569 | Propylene oxide |
| 77781 | Dimethyl sulfate |
| 79061 | Acrylamide |
| 79447 | Dimethyl carbamoyl chloride |
| 79469 | 2-Nitropropane |
| 88062 | 2,4,6-Trichlorophenol |
| 91941 | 3,3-Dichlorobenzidene |
| 92671 | 4-Aminobiphenyl |
| 92875 | Benzidine |
| 95534 | o-Toluidine |
| 95807 | 2,4-Toluene diamine |
| 96128 | 1,2-Dibromo-3-chloropropane |
| 96457 | Ethylene thiourea |
| 98077 | Benzotrichloride |
| 101144 | 4,4-Methylene bis(2-chloroaniline) |
| 101779 | 4,4-Methylenedianiline |
| 106467 | 1,4-Dichlorobenzene(p) |
| 106898 | Epichlorohydrin (l-Chloro-2,3-epoxypropane) |
| 106934 | Ethylene dibromide (Dibromoethane) |
| 106990 | 1,3-Butadiene |
| 107062 | Ethylene dichloride (1,2-Dichloroethane) |
| 107131 | Acrylonitrile |
| 107302 | Chloromethyl methyl ether |
| 117817 | Bis(2-ethylhexyl)phthalate (DEHP) |
| 118741 | Hexachlorobenzene |
| 119904 | 3,3-Dimethoxybenzidine |
| 119937 | 3,3-Dimethyl benzidine |
| 122667 | 1,2-Diphenylhydrazine |
| 123911 | 1,4-Dioxane (1,4-Diethyleneoxide) |
| 127184 | Tetrachloroethylene (Perchloroethylene) |
| 140885 | Ethyl acrylate |
| 302012 | Hydrazine |
| 542756 | 1,3-Dichloropropene |
| 542881 | Bis(chloromethyl)ether |
| 680319 | Hexamethylphosphoramide |
| 684935 | N-Nitroso-N-methylurea |
| 1120714 | 1,3-Propane sultone |
| 1332214 | Asbestos |
| 1336363 | Polychlorinated biphenyls (Aroclors) |
| 1746016 | 2,3,7,8-Tetrachlorodibenzo-p-dioxin |
| 8001352 | Toxaphene (chlorinated camphene) |
| Arsenic Compounds | |
| Chromium Compounds | |
| Coke Oven Emissions |
[67 FR 45598, July 9, 2002. Redesignated at 89 FR 94916, Nov. 29, 2024]