Determination of Attainment by the Attainment Date for the 2008 Ozone Standard; Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE Nonattainment Area

The Environmental Protection Agency (EPA) is proposing to determine that the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE marginal ozone nonattainment area (the Philadelphia Area) has attained the 2008 ozone national ambient air quality standard (NAAQS) by the July 20, 2016 attainment date. This proposed determination is based on complete, certified, and quality assured ambient air quality monitoring data for the Philadelphia Area for the 2013-2015 monitoring period. This proposed determination does not constitute a redesignation to attainment. This action is being taken under the Clean Air Act (CAA).