Approval and Promulgation of Air Quality Implementation Plans; Maryland and Virginia; Post-1996 Rate-of-Progress Plan for the Metropolitan Washington, DC Area

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EPA is proposing approval of the Post-1996 plan for the Metropolitan Washington, DC ozone nonattainment area submitted by the Maryland Department of the Environment and the Virginia Department of Environmental Quality. The Maryland Department of the Environment and the Virginia Department of Environmental Quality each submitted the Post-1996 plan as a State Implementation Plan (SIP) revision for the Metropolitan Washington, DC serious ozone nonattainment area to meet the 9% rate-of-progress (ROP) requirement (the Post-1996 plan) of the Clean Air Act (the Act). The Post-1996 plan will result in significant emission reductions through 1999 from the 1990 baseline emissions of volatile organic compounds (VOCs) and oxides of nitrogen (NO X ), which contribute to the formation of ground level ozone.