{"data":{"id":"us/40-cfr-1065.1123","jurisdiction":"us","citation":"40 CFR 1065.1123","heading":"General provisions for determining exhaust opacity.","body":"The provisions of § 1065.1125 describe system specifications for measuring percent opacity of exhaust for all types of engines. The provisions of § 1065.1127 describe how to use such a system to determine percent opacity of engine exhaust for applications other than locomotives. See 40 CFR 1033.525 for measurement procedures for locomotives.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1065—ENGINE-TESTING PROCEDURES","Subpart L—Methods for Unregulated and Special Pollutants and Additional 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":"8b7e0f6c29ced9bfdb8d09c2acea34677b72a4963a9634721dd895903816f848","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1065.1121","next":"us/40-cfr-1065.1125"},"notice":"GroundRules: Original legal text. Not legal advice."}