Approval and Promulgation of Air Quality Implementation Plans; District of Columbia, Maryland, Virginia, and West Virginia; Determinations of Attainment of the 1997 Fine Particle Standard for the Metropolitan Washington and Martinsburg-Hagerstown Nonattainment Areas

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EPA is proposing to make a determination that the Metropolitan Washington, District of Columbia-Maryland-Virginia (DC-MD-VA) and Martinsburg-Hagerstown, West Virginia-Maryland (WV-MD) fine particle (PM 2.5 ) nonattainment areas (hereafter referred to as "Areas") have attained the 1997 annual PM 2.5 National Ambient Air Quality Standard (NAAQS) by the applicable attainment date of April 5, 2010. These determinations are based upon complete, quality-assured, and certified ambient air monitoring data for the 2007-2009 monitoring period. EPA is finding these Areas to be in attainment, in accordance with the requirements of the Clean Air Act (CAA).