Approval and Promulgation of Air Quality Implementation Plans; Maryland; 2011 Base Year Inventory for the 2008 8-Hour Ozone National Ambient Air Quality Standard for the Maryland Portion of the Philadelphia-Wilmington-Atlantic City Nonattainment Area

The Environmental Protection Agency (EPA) is approving the 2011 base year inventory for the Maryland portion of the Philadelphia- Wilmington-Atlantic City marginal nonattainment area for the 2008 8- hour ozone national ambient air quality standard (NAAQS). The State of Maryland submitted the emission inventory, which included the ozone precursors, nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC), as well as several other pollutants, through the Maryland Department of the Environment (MDE) to meet the nonattainment requirements for marginal ozone nonattainment areas for the 2008 8-hour ozone NAAQS. EPA is approving the 2011 base year NO<INF>X</INF> and VOC emissions inventory for the 2008 8-hour ozone NAAQS as a revision to the Maryland State Implementation Plan (SIP) in accordance with the requirements of the Clean Air Act (CAA).