Approval and Promulgation of Implementation Plans; State of Nevada; PM-10; Determinations Regarding Attainment for the Truckee Meadows Nonattainment Area and Applicability of Certain Clean Air Act Requirements

EPA is finalizing two determinations regarding attainment for the Truckee Meadows PM-10 nonattainment area in Washoe County, Nevada ("Truckee Meadows area"). First, EPA is finalizing its determination that, based on complete and quality-assured air monitoring data for 1999-2001, the Truckee Meadows area did not attain the 24-hour National Ambient Air Quality Standard ("NAAQS") for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers ("PM-10") by the applicable attainment date of December 31, 2001. Second, EPA is finalizing its determination that the Truckee Meadows area is currently attaining the PM-10 NAAQS, based upon complete, quality-assured PM-10 air quality monitoring data during the years 2007-2009. Preliminary data through June 2010 contained in EPA's Air Quality System ("AQS") are also consistent with continued attainment of the 24-hour PM-10 NAAQS. Because the Truckee Meadows area is currently attaining the PM-10 NAAQS, EPA is also finalizing its determination that the obligation to make submissions to meet certain Clean Air Act ("CAA" or "the Act") requirements related to attainment is not applicable for as long as the area continues to attain the PM-10 NAAQS.