Hazardous Air Pollutant List (189 HAPs) (Sec 112(b))

The Hazardous Air Pollutant List, authorized by Section 112(b) of the Clean Air Act (42 U.S.C. 7401 et seq.), enumerates 189 substances identified as posing serious health or environmental risks when released into the atmosphere. The list serves as the basis for establishing source-specific emission standards and other control measures.