{"data":{"id":"us/40-cfr-52.1221","jurisdiction":"us","citation":"40 CFR 52.1221","heading":"Classification of regions.","body":"The Minnesota plan was evaluated on the basis of the following classifications:\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)\nCentral Minnesota Intrastate II III III III III\nSoutheast Minnesota-La Crosse (Wisconsin) Interstate II Ia III III III\nDuluth (Minnesota)-Superior (Wisconsin) Interstate I II III III III\nMetropolitan Fargo-Moorhead Interstate II III III III III\nMinneapolis-St. Paul Intrastate I I III I III\nNorthwest Minnesota Intrastate II III III III III\nSouthwest Minnesota Intrastate III 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 Y—Minnesota"],"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":"13ad69ddcef3c8dc567d6a10f74d9c3e5663e178ea629754f4246962cf52fc60","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.1220","next":"us/40-cfr-52.1222"},"notice":"GroundRules: Original legal text. Not legal advice."}