40 C.F.R. § 1051.805
The following symbols, acronyms, and abbreviations apply to this part:
°-degrees.
ASTM-American Society for Testing and Materials.
ATV-all-terrain vehicle.
cc-cubic centimeters.
CFR-Code of Federal Regulations.
CH4 methane.
cm-centimeter.
C-Celsius.
CO-carbon monoxide.
CO2-carbon dioxide.
EPA-Environmental Protection Agency.
F-Fahrenheit.
g-grams.
g/gal/day-grams per gallon per test day.
g/m2/day-grams per meter-square per test day.
HC-hydrocarbon.
Hg-mercury.
hr-hours.
km-kilometer.
kW-kilowatt.
LPG-liquefied petroleum gas.
m-meters.
mm-millimeters.
mW-milliwatts.
N2O nitrous oxide.
NARA-National Archives and Records Administration.
NMHC-nonmethane hydrocarbons.
NOX-oxides of nitrogen (NO and NOX).
psig-pounds per square inches of gauge pressure.
rpm-revolutions per minute.
SAE-Society of Automotive Engineers.
SI-spark-ignition.
THC-total hydrocarbon.
THCE-total hydrocarbon equivalent.
U.S.C.-United States Code.
40 C.F.R. §1051.805