StacksVerified U.S. regulatory reference

40 CFR Part 63, Table 1

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Hazardous air pollutantCAS No.
Benzene71432
1,3-Butadiene106990
Cumene98828
Ethyl benzene100414
Hexane110543
Naphthalene91203
Styrene100425
Toluene108883
o-Xylene95476
m-Xylene108383
p-Xylene106423