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

Résumé

EPA is proposing to make two determinations regarding the Washington, DC-MD-VA moderate 8-hour ozone nonattainment area (the Washington Area). First, EPA is proposing to make a determination that the Washington Area has attained the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS). This proposed 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 and 2008-2010 monitoring periods. If this proposal becomes final, the requirement for this 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 shall be suspended for so long as the area continues to attain the 1997 8-hour ozone NAAQS. Although these requirements are suspended, EPA is not precluded from acting upon these elements at any time if submitted to EPA for review and approval. Second, EPA is also proposing to determine that the Washington Area has attained the 1997 8-hour ozone NAAQS by its attainment date of June 15, 2010. T