{"data":{"id":"us/40-cfr-52.2221","jurisdiction":"us","citation":"40 CFR 52.2221","heading":"Classification of regions.","body":"The Tennessee 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)\nEastern Tennessee-Southwestern Virginia Interstate I I III III III\nTennessee River Valley-Cumberland Mountains Intrastate I I III III III\nMiddle Tennessee Intrastate I II III III I\nWestern Tennessee Intrastate I III III III III\nChattanooga Interstate I II III III III\nMetropolitan Memphis Interstate I III III III I","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS","Subpart RR—Tennessee"],"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":"04df11e57bfdd353ad8985988b5d13a26d03304b6060e9b57df453bf26b9a6f4","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.2220","next":"us/40-cfr-52.2222"},"notice":"GroundRules: Original legal text. Not legal advice."}