Designation of Areas for Air Quality Planning Purposes; Redesignation Request and Associated Maintenance Plan for Billings, MT 2010 SO2 Nonattainment Area

The Environmental Protection Agency (EPA) is approving the State of Montana's request to redesignate the Billings sulfur dioxide (SO<INF>2</INF>) nonattainment area to attainment for the 2010 SO<INF>2</INF> primary national ambient air quality standards (NAAQS). The EPA has determined that the Billings SO<INF>2</INF> nonattainment area is attaining the 2010 SO<INF>2</INF> primary NAAQS. In addition, the EPA is approving Montana's maintenance plan which provides for continued attainment of the 2010 SO<INF>2</INF> primary NAAQS in the area. These actions are being taken under the Clean Air Act (CAA).