Clean Air Act (CAA)
The Clean Air Act (CAA) restricts the types and amounts of pollutants that may be released into the air and requires permits for large, and sometimes small, polluters. Superfund cleanup responses must comply with CAA requirements and the substances that are listed as hazardous air pollutants under section 112 of the CAA are considered to be Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) hazardous substances.