Presented in Partnership with:

40 CFR, Chapter I-Environmental Protection Agency, Subchapter C-Air Programs

All files are in Adobe PDF format. To view and print these files you need the Adobe Acrobat Reader.


  • Part 50 - National Primary and Secondary Ambient Air Quality Standards
  • Part 60 - Standards of Performance for New Stationary Sources
  • Part 61 - National Emission Standards for Hazardous Air Pollutants
  • Part 63 - National Emission Standards for Hazardous Air Pollutants for Source Categories
  • Part 64 - Compliance Assurance Monitoring
  • Part 68 - Chemical Accident Prevention Provisions
  • Part 72 - Permits Regulation
  • Part 82 - Protection of Stratospheric Ozone
  • Part 89 - Control of Emissions From New and In-Use Nonroad Compression-Ignition Engines
  • Part 90 - Control of Emissions From Nonroad Spark-Ignition Engines



The information contained in this site is provided for your review and convenience. It is not intended to provide legal advice with respect to any federal, state, or local regulation.
You should consult with legal counsel and appropriate authorities before interpreting any regulations or undertaking any specific course of action.

Please note that many of the regulatory discussions on STERC refer to federal regulations. In many cases, states or local governments have promulgated relevant rules and standards
that are different and/or more stringent than the federal regulations. Therefore, to assure full compliance, you should investigate and comply with all applicable federal, state and local regulations.