Środowisko i energia · 14/09/2010

Air Quality Implementation Plans; Montana; Attainment Plan for Libby, MT PM2.5 Nonattainment Area and PM10 State Implementation Plan Revisions

EPA is proposing to approve the State Implementation Plan (SIP) revision submitted by the State of Montana on March 26, 2008. Montana submitted this SIP revision to meet Clean Air Act requirements for attaining the 15.0 micrograms per cubic meter ([mu]g/m 3 ) annual fine Particulate Matter (PM 2.5 ) national ambient air quality standard (NAAQS) for the Libby nonattainment area. The plan, herein called an "attainment plan," includes an attainment demonstration, an analysis of Reasonably Available Control Technology and Reasonably Available Control Measures (RACT/RACM), base-year and projection year emission inventories, and contingency measures. The requirement for a Reasonable Further Progress (RFP) plan is satisfied because Montana projects that attainment with the 1997 PM 2.5 NAAQS will occur in the Libby nonattainment area by April 2010. In addition, we are proposing to approve the PM 10 SIP revisions to the Lincoln County Air Pollution Control Program submitted by Montana on June 26, 2006 for inclusion into Libby's attainment plan. This submittal contains provisions, including contingency measures, for controlling both PM 10 and PM 2.5 emissions from woodstoves, road dust, and