Approval and Promulgation of Air Quality Implementation Plans; Ohio; Ohio PM2.5

The Environmental Protection Agency (EPA) is approving, under the Clean Air Act (CAA), revisions to Ohio's state implementation plan (SIP) as requested by the Ohio Environmental Protection Agency (OEPA) on June 19, 2014. The revisions to Ohio's SIP implement certain EPA regulations for particulate matter smaller than 2.5 micrometers (PM2.5) by establishing definitions related to PM2.5, defining PM2.5 increment levels, and setting PM2.5 class 1 variances. The revisions also incorporate changes made to definitions clarifying terminology consistent with Federal regulations, adding Federal land manager notification requirements, and incorporating minor organizational or typographical changes.