The following symbols, acronyms, and abbreviations apply to this part:

ABT   Averaging, banking, and trading.

AECD   Auxiliary emission control device.

CFR   Code of Federal Regulations.

CH4   methane.

CO   carbon monoxide.

CO2   carbon dioxide.

EPA   Environmental Protection Agency.

FEL   Family Emission Limit.

g   gram.

HC   hydrocarbon.

hr   hour.

kPa kilopascals.

kW kilowatt.

m   meter.

N2O   nitrous oxide.

NARA   National Archives and Records Administration.

NMHC   nonmethane hydrocarbons.

NOX   oxides of nitrogen (NO and NO2).

NTE   not-to-exceed

psig   pounds per square inch of gauge pressure.

RPM   revolutions per minute.

SAE   Society of Automotive Engineers.

THC   total hydrocarbon.

THCE   total hydrocarbon equivalent.

U.S.C.   United States Code.