This page contains the fact sheets for four separate regulations dealing with the nonattainment actions of the 2008 ozone national ambient air quality standards (NAAQS).

For the Implementation of the 2008 National Ambient Air Quality Standards (NAAQS) for Ozone: State Implementation Plan (SIP) Requirements rule, this page also contains presentation slides on the final rule , and the Response to the Comments from the Proposed Rule.

For the Air Quality Designations for the 2008 Ozone National Ambient Air Quality Standards rule, this page also contains the D.C. Circuit Court decision in NRDC v. EPA that vacated portions of this final rule involving attainment deadlines and revoking the 1997 NAAQS for purposes of transportation conformity.

To learn more about the implementation rule, visit the 2008 Ozone NAAQS Implementation Rule page.

• Final Rule (signature version) - Determinations of Attainment by the Attainment Date, Extensions of the Attainment Date, And Reclassification of Several Areas for the 2008 Ozone National Ambient Air Quality Standards (PDF)(84 pp, 335 K, April 11, 2016)
• Fact Sheet for Final Rule - Determinations of Attainment by the Attainment Date, Extensions of the Attainment Date, And Reclassification of Several Areas for the 2008 Ozone National Ambient Air Quality Standards (PDF)(3 pp, 59 K, April 11, 2016)
• Proposed Rule: Determinations of Attainment by the Attainment Date, Extensions of the Attainment Date, and Reclassification of Several Areas Classified as Marginal for the 2008 Ozone National Ambient Air Quality Standards Fact Sheet (PDF)(3 pp, 36 K, August 19, 2015)
• Final Rule - Implementation of the 2008 National Ambient Air Quality Standards for Ozone: State Implementation Plan (SIP) Requirements Fact Sheet (PDF)(2 pp, 131 K, February 13, 2015)
• Response to Comments on Implementation of the 2008 National Ambient Air Quality Standards for Ozone: State Implementation Plan Requirements (PDF)(252 pp, 2 MB, February 13, 2015)
• Final State Implementation Plan (SIP) Requirements Rule for the 2008 Ozone National Ambient Air Quality Standards (NAAQS) Presentation Slides (PDF)(34 pp, 3 MB, February 26, 2015)
• Proposed Withdrawal of the Determination that Compliance with Regional Emissions Trading Programs meets Clean Air Act Requirements to Control Emissions for the 1997 Ozone and Fine Particle Air Quality Standards Fact Sheet (PDF)(3 pp, 37 K, May 29, 2014)
• Natural Resources Defense Council (NRDC) v. Environmental Protection Agency (EPA) and Gina McCarthy No. 12-1321 (PDF)(42 pp, 199 K, December 23, 2014)