{"data":{"id":"us/40-cfr-1031.200","jurisdiction":"us","citation":"40 CFR 1031.200","heading":"Abbreviations.","body":"This part uses the following abbreviations:\nTable 1 to § 1031.200—Abbreviations\n° degree\n% percent\nCO carbon monoxide\nCO2 carbon dioxide\nEI emission index\ng gram\nHC hydrocarbon(s)\nkg kilogram\nkN kilonewton\nkW kilowatt\nLTO landing and takeoff\nm meter\nmg milligram\nµg Microgram\nNOX oxides of nitrogen\nNum number\nnvPM non-volatile particulate matter\nnvPMmass non-volatile particulate matter mass\nnvPMnum non-volatile particulate matter number\nnvPMMC non-volatile particulate matter mass concentration\nrO rated output\nrPR rated pressure ratio\nSN smoke number","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1031—CONTROL OF AIR POLLUTION FROM AIRCRAFT ENGINES","Subpart D—Reference Information"],"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":"39b720991a2910f2d57cda4b325bab2409a5d99a8ec32ed409ea9f3cf05d6789","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1031.170","next":"us/40-cfr-1031.205"},"notice":"GroundRules: Original legal text. Not legal advice."}