EPA has determined that the marginal one-hour ozone nonattainment area that includes all of Washoe County, Nevada has attained the 1-hour ozone National Ambient Air Quality Standard by the applicable attainment date (1993) and has continued to attain since that time. EPA has also determined that the moderate carbon monoxide nonattainment area that includes the Truckee Meadows area of Washoe County has attained the carbon monoxide National Ambient Air Quality Standard by the applicable attainment date (1995) and has continued to attain since that time. This determination of attainment does not redesignate the Washoe County area to attainment for the 1-hour ozone or the carbon monoxide standard. The Clean Air Act requires that, for an area to be redesignated, five criteria must be satisfied including the submittal of a maintenance plan as a State Implementation Plan revision. The intended effect of this action will be to relieve the State of Nevada of the obligation to submit revisions to the state implementation plan to address additional requirements under the Clean Air Act for the next higher nonattainment classifications for the 1- hour ozone and carbon monoxide standards.