{"data":{"id":"us/40-cfr-1054.520","jurisdiction":"us","citation":"40 CFR 1054.520","heading":"What testing must I perform to establish deterioration factors?","body":"Sections 1054.240 and 1054.245 describe the required methods for testing to establish deterioration factors for an emission family.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1054—CONTROL OF EMISSIONS FROM NEW, SMALL NONROAD SPARK-IGNITION ENGINES AND EQUIPMENT","Subpart F—Test Procedures"],"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":"e3dc06c402c63084e7be77447d7fded650a8c67733613fa2ddeba10acef5e646","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1054.505","next":"us/40-cfr-1054.601"},"notice":"GroundRules: Original legal text. Not legal advice."}