Determination of Attainment by the Attainment Date for the 2008 Ozone National Ambient Air Quality Standard; District of Columbia, Maryland, and Virginia; Washington, DC-MD-VA Area

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The Environmental Protection Agency (EPA) is making a final determination that the Washington, DC-MD-VA marginal ozone nonattainment area (the Washington Area) attained the 2008 ozone national ambient air quality standard (NAAQS) by the July 20, 2016 attainment date. This determination is based on complete, certified, and quality assured ambient air quality monitoring data for the Washington Area for the 2013-2015 monitoring period. The effect of this determination of attainment is that the Washington Area will not be bumped up or reclassified as a moderate nonattainment area. This determination of attainment is not equivalent to a redesignation, and the states in the Washington Area and the District of Columbia must meet the statutory requirements for redesignation in order to be redesignated to attainment. This determination is also not a clean data determination. This action is being taken under the Clean Air Act (CAA).