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