Air Plan Approval; California; Mammoth Lakes; Redesignation; PM10

The Environmental Protection Agency (EPA) is taking final action to approve, as a revision to the California State Implementation Plan (SIP), California's request to redesignate the Mammoth Lakes nonattainment area to attainment for the 1987 National Ambient Air Quality Standard (NAAQS) for particulate matter of ten microns or less (PM10). Also, EPA is taking final action to approve the PM10 maintenance plan for the Mammoth Lakes area and the associated motor vehicle emissions budgets for use in transportation conformity determinations. Lastly, EPA is finalizing our approval of the 2012 attainment year emissions inventory. We are taking these final actions because the SIP revision meets the requirements of the Clean Air Act and EPA guidance for maintenance plans and motor vehicle emissions budgets.