The Environmental Protection Agency (EPA) is determining that a portion of an October 26, 2010, action was in error and is making a correction pursuant to section 110(k)(6) of the Clean Air Act. The October 26, 2010, EPA action approved various revisions to Ohio regulations in the EPA approved state implementation plan (SIP). The revisions were intended to consolidate air quality standards into a new chapter of rules and to adjust the cross references accordingly in various related Ohio rules. These changes included a specific revision to the cross reference in the Ohio rule pertaining to methods for measurements for comparison with the particulate matter air quality standards. This final correction action removes any misperception that EPA approved any revision to the pertinent rule other than the revised cross reference. This action will therefore assure that the codification of the October 26, 2010, action is in accord with the actual substance of the action.