{"data":{"id":"us/40-cfr-52.2621","jurisdiction":"us","citation":"40 CFR 52.2621","heading":"Classification of regions.","body":"The Wyoming 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)\nCheyenne Intrastate II III III III III\nCasper Intrastate II III III III III\nWyoming 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 ZZ—Wyoming"],"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":"59483f0969ddbbe949e93b4ec75697706a2ab377b8febb59884ac6e3d8c6693f","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.2620","next":"us/40-cfr-52.2622"},"notice":"GroundRules: Original legal text. Not legal advice."}