{"data":{"id":"us/40-cfr-52.221","jurisdiction":"us","citation":"40 CFR 52.221","heading":"Classification of regions.","body":"The California plan was evaluated on the basis of the following classifications:\nTable 1 to § 52.221\nAir quality control region Pollutant\nParticulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)\nGreat Basin Valley Intrastate I III III III III\nLake County Intrastate II III III III I\nLake Tahoe Intrastate II III III I III\nMetropolitan Los Angeles Intrastate I III III I I\nMountain Counties Intrastate II III III I I\nNorth Central Coast Intrastate II III III III I\nNorth Coast Intrastate II III III III III\nNortheast Plateau Intrastate III III III III III\nSacramento Valley Intrastate II III III I I\nSan Diego Intrastate II III III I I\nSan Francisco Bay Area Intrastate II III III I I\nSan Joaquin Valley Intrastate II III III I I\nSouth Central Coast Intrastate III III III III I\nSoutheast Desert Intrastate 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 F—California"],"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":"e8015b1a30e2ce10c6f5558c2ca22a305e7ea3f156240f901869807a967eee32","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.220a","next":"us/40-cfr-52.222"},"notice":"GroundRules: Original legal text. Not legal advice."}