The USEPA is approving the Ohio Environmental Protection Agency's (OEPA) request for redesignation of Clinton County, Ohio from transitional ozone nonattainment to attainment. The USEPA is also approving the maintenance plan and emissions inventory for Clinton County as a revision to Ohio's State Implementation Plan (SIP) for ozone. Clinton County's monitoring data shows that it is already meeting the ozone air quality standard. In addition, in order to meet USEPA redesignation requirements the State must continue to maintain the ozone National Ambient Air Quality Standards for at least ten years after the redesignation, or the year 2006. Thus, the State has developed a maintenance plan which includes specific contingency measures to assure continued compliance with the ozone air quality standard. Any monitored violation in Clinton County will trigger these contingency measures to reduce ozone levels. In addition, an ambient air monitor will remain in operation to verify future attainment status of the area.