The abbreviations of part 86 also apply to this subpart. The abbreviations in this section apply to all of part 88. ALVW--Adjusted Loaded Vehicle WeightCO--Carbon MonoxideHCHO--FormaldehydeHC--HydrocarbonHDV--Heavy-Duty VehicleLDT--Light-Duty TruckLDV--Light-Duty VehicleNMHC--Non-Methane HydrocarbonNMHCE--Non-Methane Hydrocarbon EquivalentNMOG--Non-Methane Organic GasNOx--Nitrogen OxidesPM--Particulate MatterGVWR--Gross Vehicle Weight RatingLVW--Loaded Vehicle WeightTW--Test WeightTLEV--Transitional Low-Emission VehicleLEV--Low-Emission VehicleULEV--Ultra Low-Emission Vehicle ZEV--Zero-Emission Vehicle [57 FR 60046, Dec. 17, 1992. Redesignated and amended at 59 FR 50074, Sept. 30, 1994]