{"data":{"id":"us/40-cfr-52.2721","jurisdiction":"us","citation":"40 CFR 52.2721","heading":"Classification of regions.","body":"The Puerto Rico 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)\nPuerto Rico IA IA 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 BBB—Puerto Rico"],"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":"928928839cce952708790e0328eacb51edea17db169b40c183e0c3b78aa27214","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-52.2720","next":"us/40-cfr-52.2722"},"notice":"GroundRules: Original legal text. Not legal advice."}