Approval and Promulgation of Air Quality Implementation Plans; District of Columbia, Maryland, Virginia; One-Hour Ozone Attainment Demonstration for the Metropolitan Washington D.C. Ozone Nonattainment Area

Riepilogo

The EPA is proposing to approve the State Implementation Plans (SIPs) consisting of the 1-hour ozone attainment demonstration for the Metropolitan Washington D.C. serious nonattainment area (the Washington area) submitted by the District of Columbia's Department of Health on April 24, 1998, and October 27, 1998, by the Maryland Department of the Environment on April 29, 1998 and August 17, 1998, and by the Virginia Department of Environmental Quality on April 29, 1998, and August 18, 1998; we are also proposing to approve a request to extend the area's attainment date from November 15, 1999 to November 15, 2005, because the Washington area is affected by transported pollution from upwind areas. We are also proposing, in the alternative, to disapprove these demonstrations if Maryland, Virginia and the District do not submit an adequate motor vehicle emissions budget consistent with attainment, adopted rules needed to ensure that nonattainment area 2005 emissions levels are less than the modeled 1999 control strategy levels and in the case of the District of Columbia adopt and submit rules for the NO X reductions consistent with the modeling demonstration and a national low emissions