Approval of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Las Vegas Valley, Nevada; Redesignation to Attainment for PM10

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Nevada state implementation plan that provides for the maintenance of the national ambient air quality standard for particulate matter with an aerodynamic diameter less than or equal to a nominal ten micrometers (PM<INF>10</INF>) in Las Vegas Valley for the next ten years and to approve the related motor vehicle emissions budgets. Based in part on the approval of the PM<INF>10</INF> maintenance plan, EPA is also taking final action to grant the State of Nevada's request for redesignation of Las Vegas Valley to attainment for the PM<INF>10</INF> standard. Consistent with the assumptions of the maintenance plan, EPA is approving revisions to certain local fugitive dust rules to ensure their continued applicability after redesignation of the area to attainment. Lastly, EPA is taking final action to delete the area designation for Las Vegas Valley for the revoked national standard for total suspended particulate because the designation is no longer necessary.