On August 9, 1991, the North Carolina Department of Environmental Management (NCDEM), submitted a maintenance plan and a request to redesignate the Charlotte area from nonattainment to attainment for carbon monoxide (CO). The Charlotte CO nonattainment area consists only of Mecklenburg County. Subsequently, NCDEM submitted supplemental material to the Charlotte submittal on October 7, 1994. Included with this package was a request to redesignate the Raleigh/ Durham area from nonattainment to attainment for CO. The Raleigh/Durham CO nonattainment area consists of Durham and Wake Counties. Under the Clean Air Act as amended in 1990 (CAA), designations can be revised if sufficient data is available to warrant such revisions. In this action, EPA is approving the North Carolina request because it meets the maintenance plan and redesignation requirements set forth in the CAA.