{"data":{"id":"us/40-cfr-87.21","jurisdiction":"us","citation":"40 CFR 87.21","heading":"Exhaust emission standards for Tier 4 and earlier engines.","body":"Exhaust emission standards apply to new aircraft engines as described in 40 CFR 1031.40 through 1031.90.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 87—CONTROL OF AIR POLLUTION FROM AIRCRAFT AND AIRCRAFT ENGINES"],"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":"3ef9ccb46dead61f65d310480d1463225c059bb7472bd6f23b8ed43f6b3630cd","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-87.20","next":"us/40-cfr-87.23"},"notice":"GroundRules: Original legal text. Not legal advice."}