The following abbreviations apply to this subpart:
A/C - Air conditioning.
AECD - Auxiliary emission control device.
A/F - Air/Fuel
ALVW - Adjusted Loaded Vehicle Weight.
API - American Petroleum Institute.
ASTM - American Society for Testing and Materials.
BAT - Bench-Aging Time
C - Celsius.
cfm - Cubic feet per minute.
CFV - Critical flow venturi.
CFV-CVS - Critical flow venturi - constant volume sampler.
CH3OH - Methanol.
CID - Cubic inch displacement.
Cl - Chemiluminescence.
CO - Carbon monoxide.
CO2 - Carbon dioxide.
conc. - Concentration.
CST - Certification Short Test.
cu. in. - Cubic inch(es).
CVS - Constant volume sampler.
DDV - Durability Data Vehicle.
deg. - Degree(s).
DNPH - 2,4-dinitrophenylhydrazine.
EDV - Emission Data Vehicle.
EP - End point.
ETW - Equivalent test weight.
F - Fahrenheit.
FEL - Family Emission Limit.
FID - Flame ionization detector.
ft. - Feet.
FTP - Federal Test Procedure.
g - gram(s).
gal. - U.S. gallon(s).
GC - Gas chromatograph.
GVW - Gross vehicle weight.
GVWR - Gross vehicle weight rating.
H2O - Water.
HC - Hydrocarbon(s).
HCHO - Formaldehyde.
HDV - Heavy-duty vehicle.
HEV - Hybrid electric vehicle.
HFID - Heated flame ionization detector.
Hg - Mercury.
HLDT - Heavy light-duty truck. Includes only those trucks over 6000 pounds GVWR (LDT3s and LDT4s).
HLDT/MDPV - Heavy light-duty trucks and medium-duty passenger vehicles.
hp - Horsepower.
HPLC - High-pressure liquid chromatography.
IBP - Initial boiling point.
in. - Inch(es).
IUVP - In-Use Verification Program.
K - Kelvin.
kg - Kilogram(s).
km - Kilometer(s).
kPa - Kilopascal(s).
lb. - Pound(s).
LDT1 - Light-duty truck 1.
LDT2 - Light-duty truck 2.
LDT3 - Light-duty truck 3.
LDT4 - Light-duty truck 4.
LDV/LLDT - Light-duty vehicles and light light-duty trucks. Includes only those trucks rated at 6000 pounds GVWR or less (LDT1s and LDT2s).
LDV/T - Light-duty vehicles and light-duty trucks. This term is used collectively to include, or to show that a provision applies to, all light-duty vehicles and all categories of light-duty trucks, i.e.
LDT1, LDT2, LDT3 and LDT4.
LEV - Low Emission Vehicle.
LPG - Liquefied Petroleum Gas.
m - Meter(s).
max. - Maximum.
MDPV - Medium-duty passenger vehicle.
mg - Milligram(s).
mi. - Mile(s).
min. - Minimum.
ml - Milliliter(s).
mm - Millimeter(s).
mph - Miles per hour.
mV - Millivolt
N2 - Nitrogen.
NDIR - Nondispersive infrared.
NLEV - Refers to the National Low Emission Vehicle Program. Regulations governing this program are found at subpart R of this part.
NMHC - Nonmethane Hydrocarbons.
NMHCE - Non-Methane Hydrocarbon Equivalent.
NMOG - Non-methane organic gases.
NO - nitric oxide.
No. - Number.
O2 - Oxygen.
OEM - Original equipment manufacturer.
NO2 - Nitrogen dioxide.
NOX - Oxides of nitrogen.
Pb - Lead.
pct. - Percent.
PDP-CVS - Positive displacement pump - constant volume sampler.
ppm - Parts per million by volume.
PM - Particulate Matter.
ppm C - Parts per million, carbon.
psi - Pounds per square inch.
R - Rankin.
RAF - Reactivity adjustment factor.
rpm - Revolutions per minute.
RVP - Reid vapor pressure.
s - Second(s).
SAE - Society of Automotive Engineers.
SBC - Standard Bench Cycle
SFTP - Supplemental Federal Test Procedure.
SI - International system of units.
SRC - Standard Road Cycle
SULEV - Super Ultra Low Emission Vehicle.
TD - dispensed fuel temperature.
THC - Total Hydrocarbons.
THCE - Total Hydrocarbon Equivalent.
TLEV - Transitional Low Emission Vehicle.
UDDS - Urban dynamometer driving schedule.
ULEV - Ultra Low Emission Vehicle.
UV - Ultraviolet.
vs - Versus.
W - Watt(s).
WOT - Wide open throttle.
Wt. - Weight.
ZEV - Zero Emission Vehicle.
[64 FR 23925, May 4, 1999, as amended at 65 FR 6852, Feb. 10, 2000; 65 FR 59965, Oct. 6, 2000; 71 FR 2829, Jan. 17, 2006]