The USEPA approves a revision submitted on July 9, 1996, and January 31, 1997, to the ozone maintenance plans for the Dayton- Springfield Area (Miami, Montgomery, Clark, and Greene Counties), Toledo Area (Lucas and Wood Counties), Canton Area (Stark County), Ohio portion of the Youngstown-Warren-Sharon Area (Mahoning and Trumbull Counties), Columbus Area (Franklin, Delaware, and Licking Counties), Cleveland-Akron-Lorain Area (Ashtabula, Cuyahoga, Lake, Lorain, Medina, Summit, Portage, and Geauga Counties), Preble County, Jefferson County, Columbiana and Clinton Counties. The revision is based on a request from the State of Ohio to revise the Federally approved maintenance plan for these areas to provide the State and the affected areas with greater flexibility in choosing an appropriate ozone contingency measure for each area in the event such a measure is needed. This action approves the State's request as a common-sense approach to protecting air quality in Ohio. In the proposed rule section of this Federal Register, USEPA is proposing approval of this revision, and is now soliciting public comments on this action. If adverse comments are received on this direct final rule, USEPA will withdraw this final rule and address these comments in a subsequent final rule based on the proposed rule.