Approval and Promulgation of Air Quality Implementation Plans; Maryland; One-Hour Ozone Attainment Demonstration for the Philadelphia-Wilmington-Trenton Ozone Nonattainment Area

EPA is approving the attainment demonstration for the one-hour ozone national ambient air quality standard (NAAQS) for the Philadelphia-Wilmington-Trenton severe nonattainment area (the Philadelphia area) as a revision to the Maryland State Implementation Plan (SIP). This control strategy plan was submitted by the Maryland Department of the Environment (MDE). The measures that have been adopted by the State which comprise the control strategy of the one- hour ozone attainment demonstration have and will result in significant emission reductions of volatile organic compounds (VOCs) and oxides of nitrogen (NO<INF>X</INF>) in the Philadelphia area. The Philadelphia area is comprised of two counties in Delaware, one county in Maryland (namely, Cecil County), seven counties in New Jersey, and five counties in Pennsylvania. The intended effect of this action is to approve this SIP revision as meeting the requirements of the Clean Air Act (CAA or the Act).