Regulations last checked for updates: May 16, 2024

Title 40 - Protection of Environment last revised: May 14, 2024
All TitlesTitle 40Chapter IPart 63Subpart XXAppendix - Table 1 to Subpart XX of Part 63—Hazardous Air Pollutants
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Appendix - Table 1 to Subpart XX of Part 63—Hazardous Air Pollutants
Hazardous air pollutant CAS No.
Benzene71432
1,3-Butadiene106990
Cumene98828
Ethyl benzene100414
Hexane110543
Naphthalene91203
Styrene100425
Toluene108883
o-Xylene95476
m-Xylene108383
p-Xylene106423
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.
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