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Table 1 to Subpart XX of Part 63—Hazardous Air Pollutants

Hazardous Air Pollutants

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  3. Title 40
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  5. Chapter I
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  7. Part 63
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  9. Subpart XX
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  11. Subject Group Implementation and Enforcement
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  13. Appendix Table 1 to Subpart XX of Part 63
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Displayed edition2026-04-27
Last updated2026-04-27

Table 1 to Subpart XX of Part 63—Hazardous Air Pollutants

Hazardous air pollutantCAS No.
Benzene71432
1,3-Butadiene106990
Cumene98828
Ethyl benzene100414
Hexane110543
Naphthalene91203
Styrene100425
Toluene108883
o-Xylene95476
m-Xylene108383
p-Xylene106423