40 CFR Appendix: Table 1 to Subpart HHH of Part 63 — List of Hazardous Air Pollutants (HAP) for Subpart HHH
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| CAS Number a | Chemical name |
|---|---|
| 75070 | Acetaldehyde |
| 71432 | Benzene (includes benzene in gasoline) |
| 75150 | Carbon disulfide |
| 463581 | Carbonyl sulfide |
| 100414 | Ethyl benzene |
| 107211 | Ethylene glycol |
| 75050 | Acetaldehyde |
| 50000 | Formaldehyde |
| 110543 | n-Hexane |
| 91203 | Naphthalene |
| 108883 | Toluene |
| 540841 | 2,2,4-Trimethylpentane |
| 1330207 | Xylenes (isomers and mixture) |
| 95476 | o-Xylene |
| 108383 | m-Xylene |
| 106423 | p-Xylene |
a CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.