Determination of Attainment for PM-10; Fort Hall PM-10 Nonattainment Area, Idaho

EPA is finalizing its determination that the Fort Hall PM-10 nonattainment area on the Fort Hall Indian Reservation in Idaho has attained the National Ambient Air Quality Standard for particulate matter with an aerodynamic diameter of less than or equal to 10 microns (PM-10) under the Clean Air Act. EPA's final determination that the Fort Hall PM-10 nonattainment area has attained the 24[dash]hour PM-10 National Ambient Air Quality Standard is based on EPA's review of complete, quality- assured air quality data for the three-year period ending December 31, 2009. Currently available preliminary data for 2010 indicate that the area continues to attain the standard. EPA's determination of attainment is not equivalent to a redesignation to attainment under Clean Air Act section 107(d)(3). The Fort Hall PM-10 nonattainment area's designation for PM-10 will remain moderate nonattainment until such time as the area is redesignated to attainment as provided in Clean Air Act section 107(d)(3).