The following symbols, acronyms, and abbreviations apply to this part:
CFR Code of Federal Regulations.
CH4 methane.
CO carbon monoxide.
CO2 carbon dioxide.
DEF Diesel exhaust fluid.
EEFM Emergency equipment field modification.
EPA Environmental Protection Agency.
FEL Family Emission Limit.
g/kW-hr grams per kilowatt-hour.
HC hydrocarbon.
ISO International Organization for Standardization (see www.iso.org).
kW kilowatts.
N2O nitrous oxide.
NIST National Institute of Standards and Technology.
NMHC nonmethane hydrocarbons.
NOX oxides of nitrogen (NO and NO2).
NTE not-to-exceed
PM particulate matter.
rpm revolutions per minute.
SAE Society of Automotive Engineers.
SCR Selective catalytic reduction.
SEA Selective enforcement audit.
THC total hydrocarbon.
THCE total hydrocarbon equivalent.
TRU transportation refrigeration unit.
U.S.C. United States Code.
[69 FR 39213, June 29, 2004, as amended at 74 FR 56509, Oct. 30, 2009; 77 FR 34148, June 8, 2012]