Approval and Promulgation of Air Quality Implementation Plans; Maryland; Attainment Demonstration for the 1997 8-Hour Ozone National Ambient Air Quality Standard for the Philadelphia-Wilmington-Atlantic City Moderate Nonattainment Area
EPA is approving the attainment demonstration portion of the attainment plan submitted by the State of Maryland as a State Implementation Plan (SIP) revision. The Maryland SIP revision demonstrates attainment of the 1997 8-hour ozone national ambient air quality standard (NAAQS) for the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE moderate nonattainment area (Philadelphia Area) by the applicable attainment date of June 2011. EPA is approving the SIP revision in accordance with the requirements of the Clean Air Act (CAA).