Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of Nevada; Redesignation of Las Vegas Valley to Attainment for the Carbon Monoxide Standard

EPA is taking final action to approve the State of Nevada's request to redesignate to attainment the Las Vegas Valley nonattainment area for the carbon monoxide national ambient air quality standard. EPA is also taking final action to approve the carbon monoxide maintenance plan and motor vehicle emissions budgets for the area, as well as certain additional revisions to the Nevada state implementation plan that relate to Las Vegas Valley. These revisions include the suspension of a local wintertime cleaner burning gasoline rule, and the relaxation of a State rule governing wintertime gasoline in Clark County. EPA's proposed approval of the redesignation request and maintenance plan had been made contingent upon receipt of a supplemental submittal from the State of Nevada containing a commitment to seek reinstatement of the existing vapor pressure limit in the State wintertime gasoline rule, if necessary, to implement the related contingency measure in the maintenance plan. Nevada has now submitted, and EPA is today approving, the necessary commitment as a revision to the Nevada state implementation plan.