{"data":{"id":"us/40-cfr-1051.805","jurisdiction":"us","citation":"40 CFR 1051.805","heading":"What symbols, acronyms, and abbreviations does this part use?","body":"The following symbols, acronyms, and abbreviations apply to this part:\n°—degrees.\nASTM—American Society for Testing and Materials.\nATV—all-terrain vehicle.\ncc—cubic centimeters.\nCFR—Code of Federal Regulations.\nCH4 methane.\ncm—centimeter.\nC—Celsius.\nCO—carbon monoxide.\nCO2—carbon dioxide.\nEPA—Environmental Protection Agency.\nF—Fahrenheit.\ng—grams.\ng/gal/day—grams per gallon per test day.\ng/m 2/day—grams per meter-square per test day.\nHC—hydrocarbon.\nHg—mercury.\nhr—hours.\nkm—kilometer.\nkW—kilowatt.\nLPG—liquefied petroleum gas.\nm—meters.\nmm—millimeters.\nmW—milliwatts.\nN2O nitrous oxide.\nNARA—National Archives and Records Administration.\nNMHC—nonmethane hydrocarbons.\nNOX—oxides of nitrogen (NO and NOX).\npsig—pounds per square inches of gauge pressure.\nrpm—revolutions per minute.\nSAE—Society of Automotive Engineers.\nSI—spark-ignition.\nTHC—total hydrocarbon.\nTHCE—total hydrocarbon equivalent.\nU.S.C.—United States Code.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1051—CONTROL OF EMISSIONS FROM RECREATIONAL ENGINES AND VEHICLES","Subpart I—Definitions and Other 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":"942491749c877e86c166b26734b5aa839f08c4cc6b8ee4cbb873761432f7c36d","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1051.801","next":"us/40-cfr-1051.815"},"notice":"GroundRules: Original legal text. Not legal advice."}