{"data":{"id":"us/40-cfr-52.2321","jurisdiction":"us","citation":"40 CFR 52.2321","heading":"Classification of regions.","body":"The Utah 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)\nWasatch Front Intrastate I I I I I\nFour Corners Interstate IA IA III III III\nUtah 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 TT—Utah"],"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":"36791d29182f8324e5e3ae0b1342f3f4403d0c964c90dff31d8e6d70001109e2","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.2320","next":"us/40-cfr-52.2322"},"notice":"GroundRules: Original legal text. Not legal advice."}