Approval and Promulgation of Air Quality Implementation Plans; District of Columbia; Infrastructure Requirements for the 2008 Ozone, 2010 Nitrogen Dioxide, and 2010 Sulfur Dioxide National Ambient Air Quality Standards; Approval of Air Pollution Emergency Episode Plan

The Environmental Protection Agency (EPA) is approving portions of three State Implementation Plan (SIP) revision submittals from the District of Columbia (the District) pursuant to the Clean Air Act (CAA). Whenever new or revised national ambient air quality standards (NAAQS) are promulgated, the CAA requires states to submit a plan for the implementation, maintenance, and enforcement of such NAAQS. The plan is required to address basic program elements, including, but not limited to, regulatory structure, monitoring, modeling, legal authority, and adequate resources necessary to assure attainment and maintenance of the standards. These elements are referred to as infrastructure requirements. The District has made three separate submittals addressing the infrastructure requirements for the 2008 ozone NAAQS, the 2010 nitrogen dioxide (NO<INF>2</INF>) NAAQS, and the 2010 sulfur dioxide (SO<INF>2</INF>) NAAQS. One of the submittals also includes the "Revised Air Quality Emergency Plan for the District of Columbia" for satisfying EPA's requirements for air quality emergency episodes.