Environmental Protection Agency July 2, 2013 – Federal Register Recent Federal Regulation Documents

EPA is approving State Implementation Plan (SIP) submittals from the State of West Virginia 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. West Virginia has made submittals addressing the infrastructure requirements for the 2008 8-hour ozone NAAQS. This action approves portions of those submittals.

On July 5, 2011, the Michigan Department of Environmental Quality (MDEQ) submitted a request for EPA to redesignate the Detroit- Ann Arbor Michigan nonattainment area (Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, and Wayne Counties), referred to as the Detroit-Ann Arbor area, to attainment of the Clean Air Act (CAA or Act) 1997 annual and the 2006 24-hour national ambient air quality standards (NAAQS or standard) for fine particulate matter (PM2.5). EPA is proposing to redesignate the area. EPA is also proposing several additional related actions. EPA is proposing to determine that the entire Detroit-Ann Arbor area continues to attain both the annual and 24-hour PM2.5 standards. EPA is proposing to approve, as revisions to the Michigan state implementation plan (SIP), the state's plan for maintaining the 1997 annual and the 2006 24-hour PM2.5 NAAQS through 2022 in the area. EPA previously approved the base year emissions inventory for the Detroit-Ann Arbor area, which met the comprehensive emissions inventory requirement of the Act. Michigan's maintenance plan submission includes a budget for the mobile source contribution of PM2.5 and nitrogen oxides (NOX) to the Detroit-Ann Arbor Michigan PM2.5 area for transportation conformity purposes, which EPA is proposing to approve. EPA is proposing to take this action in accordance with the CAA and EPA's implementation regulations regarding the 1997 and the 2006 PM2.5 NAAQS.