Title 40

Title 40 of the U.S. Code of Federal Regulations (CFR) contains the rules EPA uses to implement the requirements of the Clean Air Act (among other statutes). The Parts most applicable to air pollution are:

40 CFR 51 Requirements for Preparation, Adoption, and Submittal of Implementation Plans
40 CFR 60 Standards of Performance for New Stationary Sources
40 CFR 61 National Emission Standards for Hazardous Air Pollutants
40 CFR 63 National Emission Standards for Hazardous Air Pollutants for Source Categories
40 CFR 64 Compliance Assurance Monitoring
40 CFR 75 Continuous Emission Monitoring