Approval and Promulgation of Air Quality Implementation Plans; District of Columbia, Maryland, and Virginia; Determinations of Attainment of the 1997 8-Hour Ozone National Ambient Air Quality Standard for the Washington, DC-MD-VA 8-Hour Ozone Moderate Nonattainment Area

EPA is making two determinations regarding the Washington, DC- MD-VA moderate 8-hour ozone nonattainment area (the Washington Area). First, EPA is making a determination that the Washington Area has attained the 1997 8-hour ozone national ambient air quality standard (NAAQS) by its June 15, 2010 attainment date. This determination is based upon complete, quality assured, and certified ambient air monitoring data that show the area has monitored attainment of the 1997 8-hour ozone NAAQS for the 2007-2009 monitoring period. Second, EPA is making a clean data determination, finding that the Washington Area has attained the 1997 8-hour ozone NAAQS, based on complete, quality assured, and certified ambient air monitoring data for the 2007-2009 and 2008-2010 monitoring periods. In accordance with EPA's applicable ozone implementation rule, this clean data determination suspends the requirement for the Washington Area to submit an attainment demonstration, reasonably available control measures (RACM), a reasonable further progress (RFP) plan and contingency measures related to attainment of the 1997 8-hours ozone NAAQS. These requirements shall be suspended for so long as the area continues to attain the 1997 8- hour ozone NAAQS. These actions are being taken under the Clean Air Act (CAA).