40 CFR § 52.14 Approval and Promulgation of Implementation Plans
§ 52.14 State ambient air quality standards.
Current through Aug 22, 2025 · Read all of Part 52
⚠ 50 pending changes to Part 52
- Air Plan Approval; Alabama; Transportation ConformityRule · takes effect Oct 26, 2026 · Environmental Protection Agency
- Air Plan Approval; Missouri; Control of NOX Emissions From Large Stationary Internal Combustion EnginesRule · takes effect Nov 2, 2026 · Environmental Protection Agency
- Attainment Date Extension for the South Coast, California 2012 Annual PM2.5 Fine Particulate Matter Nonattainment AreaRule · takes effect Nov 2, 2026 · Environmental Protection Agency
- Air Plan Approval; Maryland; Reasonably Available Control Technology for Municipal Waste CombustorsRule · takes effect Nov 9, 2026 · Environmental Protection Agency
- Air Plan Approval; Missouri; Construction Permit ExemptionsRule · takes effect Nov 9, 2026 · Environmental Protection Agency
- Air Plan Approval; GA; Removal of Nonattainment Area New Source ReviewRule · takes effect Nov 9, 2026 · Environmental Protection Agency
- Air Plan Approval; Kentucky; Louisville Area Limited Maintenance Plan for the 1997 8-Hour Ozone NAAQSRule · takes effect Nov 9, 2026 · Environmental Protection Agency
- Air Plan Approval; Oklahoma; Interstate Transport Requirements for the 2010 SO2 NAAQSRule · takes effect Nov 9, 2026 · Environmental Protection Agency
- Approval and Promulgation of State Implementation Plans; New Jersey; RACT Certifications for the 2008 and 2015 Ozone National Ambient Air Quality StandardsRule · takes effect Nov 9, 2026 · Environmental Protection Agency
- Approval and Promulgation of Implementation Plans; Arizona; Revisions to the Cleaner Burning Gasoline, Winter Oxygenated Fuel, and Gasoline Set-Aside ProgramsRule · takes effect Nov 18, 2026 · Environmental Protection Agency
Any ambient air quality standard submitted with a plan which is less stringent than a national standard is not considered part of the plan.