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

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EPA is proposing 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 proposing 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. 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 is contingent upon receipt of a supplemental submittal from the State of Nevada containing a commitment to reinstate the existing vapor pressure limit in the State wintertime gasoline rule, if necessary, and thereby to implement the related contingency measure in the maintenance plan.