{"data":{"id":"us/40-cfr-52.04","jurisdiction":"us","citation":"40 CFR 52.04","heading":"Classification of regions.","body":"Each subpart sets forth the priority classification, by pollutant, for each region in the State. Each plan for each region was evaluated according to the requirements of part 51 of this chapter applicable to regions of that priority.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS","Subpart A—General Provisions"],"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":"cee271b50e17b9a51c61ddf03db37236ff2791a616e53f05014a072bfe566a8e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.02","next":"us/40-cfr-52.05"},"notice":"GroundRules: Original legal text. Not legal advice."}