On May 14, 1997 USEPA published a direct final rule (62 FR 26396) approving, and an accompanying proposed rule (62 FR 26463) proposing to approve 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 Trumbell 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 was based on a request from the State of Ohio to revise the federally approved maintenance plan for those areas to provide the state and the affected areas with greater flexibility in choosing the appropiate ozone contingency measures for each area in the event such a measure is needed. The USEPA is postponing the effective date of this rule for 60 days to allow for a 60 day extension of the public comment period. In the proposed rules section of this Federal Register, USEPA announces a 60 day extension of the public comment period on these maintenance plans.