{"data":{"id":"us/40-cfr-52.1871","jurisdiction":"us","citation":"40 CFR 52.1871","heading":"Classification of regions.","body":"The Ohio plan was evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone\nGreater Metropolitan Cleveland Intrastate I I III III I\nHuntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate I III III III III\nMansfield-Marion Intrastate II II III III III\nMetropolitan Cincinnati Interstate I II III III I\nMetropolitan Columbus Intrastate I III III III I\nMetropolitan Dayton Intrastate I II III III I\nMetropolitan Toledo Interstate I I III III I\nNorthwest Ohio Intrastate II I III III III\nNorthwest Pennsylvania-Youngstown Interstate I II III III III\nParkersburg (West Virginia)-Marietta (Ohio) Interstate I II III III III\nSandusky Intrastate III III III III III\nSteubenville-Weirton-Wheeling Interstate I I III III III\nWilmington-Chillicothe-Logan Intrastate III III III III III\nZanesville-Cambridge Intrastate II IA III III III","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS","Subpart KK—Ohio"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"0c33d81352f899f7e947776b3778b1eb37ce31d6025a77b137aede575421cd17","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1870","next":"us/40-cfr-52.1872"},"notice":"GroundRules: Original legal text. Not legal advice."}