40 CFR Part 63, Table 5 — List of HAP That Must Be Counted Toward Total Organic HAP Content if Present at 0.1 Percent or More by Mass
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Chemical name | CAS No. |
|---|---|
| 1,1,2,2-Tetrachloroethane | 79-34-5 |
| 1,1,2-Trichloroethane | 79-00-5 |
| 1,1-Dimethylhydrazine | 57-14-7 |
| 1,2-Dibromo-3-chloropropane | 96-12-8 |
| 1,2-Diphenylhydrazine | 122-66-7 |
| 1,3-Butadiene | 106-99-0 |
| 1,3-Dichloropropene | 542-75-6 |
| 1,4-Dioxane | 123-91-1 |
| 2,4,6-Trichlorophenol | 88-06-2 |
| 2,4/2,6-Dinitrotoluene (mixture) | 25321-14-6 |
| 2,4-Dinitrotoluene | 121-14-2 |
| 2,4-Toluene diamine | 95-80-7 |
| 2-Nitropropane | 79-46-9 |
| 3,3′-Dichlorobenzidine | 91-94-1 |
| 3,3′-Dimethoxybenzidine | 119-90-4 |
| 3,3′-Dimethylbenzidine | 119-93-7 |
| 4,4′-Methylene bis(2-chloroaniline) | 101-14-4 |
| Acetaldehyde | 75-07-0 |
| Acrylamide | 79-06-1 |
| Acrylonitrile | 107-13-1 |
| Allyl chloride | 107-05-1 |
| alpha-Hexachlorocyclohexane (a-HCH) | 319-84-6 |
| Aniline | 62-53-3 |
| Benzene | 71-43-2 |
| Benzidine | 92-87-5 |
| Benzotrichloride | 98-07-7 |
| Benzyl chloride | 100-44-7 |
| beta-Hexachlorocyclohexane (b-HCH) | 319-85-7 |
| Bis(2-ethylhexyl)phthalate | 117-81-7 |
| Bis(chloromethyl)ether | 542-88-1 |
| Bromoform | 75-25-2 |
| Captan | 133-06-2 |
| Carbon tetrachloride | 56-23-5 |
| Chlordane | 57-74-9 |
| Chlorobenzilate | 510-15-6 |
| Chloroform | 67-66-3 |
| Chloroprene | 126-99-8 |
| Cresols (mixed) | 1319-77-3 |
| DDE | 3547-04-4 |
| Dichloroethyl ether | 111-44-4 |
| Dichlorvos | 62-73-7 |
| Epichlorohydrin | 106-89-8 |
| Ethyl acrylate | 140-88-5 |
| Ethylene dibromide | 106-93-4 |
| Ethylene dichloride | 107-06-2 |
| Ethylene oxide | 75-21-8 |
| Ethylene thiourea | 96-45-7 |
| Ethylidene dichloride (1,1-Dichloroethane) | 75-34-3 |
| Formaldehyde | 50-00-0 |
| Heptachlor | 76-44-8 |
| Hexachlorobenzene | 118-74-1 |
| Hexachlorobutadiene | 87-68-3 |
| Hexachloroethane | 67-72-1 |
| Hydrazine | 302-01-2 |
| Isophorone | 78-59-1 |
| Lindane (hexachlorocyclohexane, all isomers) | 58-89-9 |
| m-Cresol | 108-39-4 |
| Methylene chloride | 75-09-2 |
| Naphthalene | 91-20-3 |
| Nitrobenzene | 98-95-3 |
| Nitrosodimethylamine | 62-75-9 |
| o-Cresol | 95-48-7 |
| o-Toluidine | 95-53-4 |
| Parathion | 56-38-2 |
| p-Cresol | 106-44-5 |
| p-Dichlorobenzene | 106-46-7 |
| Pentachloronitrobenzene | 82-68-8 |
| Pentachlorophenol | 87-86-5 |
| Propoxur | 114-26-1 |
| Propylene dichloride | 78-87-5 |
| Propylene oxide | 75-56-9 |
| Quinoline | 91-22-5 |
| Tetrachloroethene | 127-18-4 |
| Toxaphene | 8001-35-2 |
| Trichloroethylene | 79-01-6 |
| Trifluralin | 1582-09-8 |
| Vinyl bromide | 593-60-2 |
| Vinyl chloride | 75-01-4 |
| Vinylidene chloride | 75-35-4 |
[85 FR 41160, July 8, 2020]