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This proposed rule will address a range of implementation requirements for the 2015 National Ambient Air Quality Standards (NAAQS) for ozone, including the nonattainment area classification system, and the timing of State Implementation Plan (SIP) submissions. It will also discuss and outline relevant guidance on meeting the Clean Air Act's requirements pertaining to attainment demonstrations, reasonable further progress, reasonably available control measures, nonattainment new source review, and emission inventories. Other issues addressed in this proposed rule are the potential revocation of the 2008 ozone NAAQS and anti-backsliding requirements that would apply if the 2008 NAAQS are revoked. The items covered in this rulemaking have been covered in similar rulemakings for two prior 8-hour ozone NAAQS (1997 and 2008).