NGV Info Center - About NGVs
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Acronyms Unscrambled: A Glossary of Terms
CARB:
California Air Resources Board, the State agency that certifies the emissions of vehicles at to various levels such as ULEV, SULEV and ZEV and maintains the lists of qualifying vehicles for the program.
CHP:
California Highway Patrol, the State's vehicle and highway law enforcement agency.
EPA:
US Environmental Protection Agency, responsible for the federal ILEV program and for certifying vehicles to the ILEV standard.
HOV:
high occupancy vehicle, one carrying at least two or three occupants, depending on the regulated highway segment. HOV-restricted lanes in California are commonly referred to as "diamond lanes."
ILEV:
inherently low emission vehicle, a federal EPA designation that indicates a clean air vehicle that remains clean even if certain emission control devices on the vehicle fail or malfunction. The concept of exempting clean air vehicles from HOV lane access restrictions originated with the federal ILEV program in March 1993. Practically speaking, only natural gas and electric powered vehicles have to date certified to meet the ILEV standard.
NGV:
natural gas vehicle, or more specifically, a vehicle that operates only on natural gas fuel, for purposes of this program.
SULEV:
super ultra-low emission vehicle, as defined by the regulations of ARB. By definition, a vehicle meeting the SULEV standard for its type and class also meets the corresponding ULEV standard.
ULEV:
ultra-low emission vehicle, as defined by the regulations of the ARB and the least clean vehicle to qualify for this program.
ZEV:
a zero emission vehicle, or more specifically, a battery-powered vehicle, for purposes of this program.
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