eCFR.io
Daily eCFR

Appendix: Table 1 to Subpart HHH of Part 63—List of Hazardous Air Pollutants (HAP) for Subpart HHH

List of Hazardous Air Pollutants (HAP) for Subpart HHH

  1. CFR
  2. ›
  3. Title 40
  4. ›
  5. Chapter I
  6. ›
  7. Part 63
  8. ›
  9. Subpart HHH
  10. ›
  11. Appendix Appendix: Table 1 to Subpart HHH of Part 63
CorpusDaily eCFR
Displayed edition2026-04-27
Last updated2026-04-27

Appendix: Table 1 to Subpart HHH of Part 63—List of Hazardous Air Pollutants (HAP) for Subpart HHH

CAS Number aChemical name
75070Acetaldehyde
71432Benzene (includes benzene in gasoline)
75150Carbon disulfide
463581Carbonyl sulfide
100414Ethyl benzene
107211Ethylene glycol
75050Acetaldehyde
50000Formaldehyde
110543n-Hexane
91203Naphthalene
108883Toluene
5408412,2,4-Trimethylpentane
1330207Xylenes (isomers and mixture)
95476o-Xylene
108383m-Xylene
106423p-Xylene
a CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.