Code of Federal Regulations > Title 40 > Chapter I > Part 51 > Subpart AA - Subpart AA—Provisions for Implementation of the 2008 Ozone National Ambient Air Quality Standards

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

§ 51.1100 - Definitions.

§ 51.1101 - Applicability of part 51.

§ 51.1102 - Classification and nonattainment area planning provisions.

§ 51.1103 - Application of classification and attainment date provisions in CAA section 181 to areas subject to § 51.1102.

§ 51.1104 - [Reserved]

§ 51.1105 - Transition from the 1997 ozone NAAQS to the 2008 ozone NAAQS and anti-backsliding.

§ 51.1106 - Redesignation to nonattainment following initial designations.

§ 51.1107 - Determining eligibility for 1-year attainment date extensions for the 2008 ozone NAAQS under CAA section 181(a)(5).

§ 51.1108 - Modeling and attainment demonstration requirements.

§ 51.1109 - [Reserved]

§ 51.1110 - Requirements for reasonable further progress (RFP).

§ 51.1111 - [Reserved]

§ 51.1112 - Requirements for reasonably available control technology (RACT) and reasonably available control measures (RACM).

§ 51.1113 - Section 182(f) NOX exemption provisions.

§ 51.1114 - New source review requirements.

§ 51.1115 - Emissions inventory requirements.

§ 51.1116 - Requirements for an Ozone Transport Region.

§ 51.1117 - Fee programs for Severe and Extreme nonattainment areas that fail to attain.

§ 51.1118 - Suspension of SIP planning requirements in nonattainment areas that have air quality data that meet an ozone NAAQS.

§ 51.1119 - Applicability.