This document corrects an error in the codification in an October 26, 2010, final rule under the Clean Air Act. This rule approved revisions to Ohio regulations that consolidated air quality standards in a new chapter of rules and adjusted the rule references accordingly in various related rules. Of particular note is a revision that adjusted the provision for measurements for comparison with the particulate matter air quality standards. EPA erroneously codified approval of the entirety of the rule, which may be misread as having inadvertently approved several other provisions which were not addressed in the October 26, 2010 final rule, and which EPA in separate rulemaking had proposed to disapprove. Therefore, EPA is correcting its action to clarify the codification to show that only one paragraph of this rule was approved. This action simply makes the codification consistent with the approval.