{"data":{"id":"us/40-cfr-52.2571","jurisdiction":"us","citation":"40 CFR 52.2571","heading":"Classification of regions.","body":"The Wisconsin plan was evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone\nDuluth (Minnesota)-Superior (Wisconsin) Interstate I II III III III\nNorth Central Wisconsin Intrastate II III III III III\nLake Michigan Intrastate II III III III III\nSoutheast Minnesota-La Crosse (Wisconsin) Interstate II IA III III III\nSouthern Wisconsin Intrastate II III III III III\nSoutheastern Wisconsin Intrastate I II III III I\nRockford (Illinois)-Jamesville-Beloit (Wisconsin) Interstate II III III III III\nMetropolitan Dubuque Interstate I III 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 YY—Wisconsin"],"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":"6bf8ec4a2ec0c43ed794427a896cf5518b163bdffffdfd3a48eccd3872307916","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.2570","next":"us/40-cfr-52.2572"},"notice":"GroundRules: Original legal text. Not legal advice."}