Approval and Promulgation of Implementation Plans; Michigan; Detroit-Ann Arbor Nonattainment Area; Fine Particulate Matter 2005 Base Year Emissions Inventory

EPA is approving the fine particulate matter (PM2.5) 2005 base year emissions inventory, a portion of the State Implementation Plan (SIP) revision submitted by the Michigan Department of Environmental Quality (MDEQ) on June 13, 2008. The emissions inventory is part of Michigan's SIP revision that was submitted to meet the nonattainment requirements related to the state's Detroit-Ann Arbor (Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, and Wayne Counties) nonattainment area for the 1997 annual PM2.5 national ambient air quality standards (NAAQS). This action is being taken pursuant to sections 110 and 172 of the Clean Air Act (CAA).