The following abbreviations apply to this subpart: A/C--Air conditioning.AECD--Auxiliary emission control device.A/F--Air/FuelALVW--Adjusted Loaded Vehicle Weight.API--American Petroleum Institute.ASTM--American Society for Testing and Materials.BAT--Bench-Aging TimeC--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--MillivoltN2--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 CycleSFTP--Supplemental Federal Test Procedure.SI--International system of units.SRC--Standard Road CycleSULEV--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]