California defines a ULEV as a vehicle that has been verified by the
California Air Resources Board (CARB), United States to emit 50% less
polluting emissions than the average for new cars released in that model year. Under LEV II regulations, the Tier I and TLEV classifications were removed for 2004. The ULEV is one of a number of designations given by the CARB to signify the level of emissions that car-buyers can expect their new vehicle to produce and forms part of a whole range of designations, listed here in order of decreasing emissions: ;TLEV (transitional low-emission vehicle) :The least stringent emissions standard in California. California phased-out TLEVs in 2004. ;
LEV (low-emission vehicle) :The minimum standard for all new cars sold in California as of 2004. ;ULEV (ultra-low-emission vehicle) ;
SULEV (super-ultra-low-emission vehicle) :SULEV emissions are 90% cleaner than the average new model year car. ;
PZEV (partial-zero-emission vehicle) :A PZEV meets SULEV tailpipe emission standards, but has no evaporative emissions (i.e., no unburned fuel leaves the fuel system). A PZEV has a 15-year / 150,000-mile warranty on its emission control components. ;AT PZEV (advanced technology partial-zero-emission vehicle) :An AT PZEV meets the PZEV requirements but also meets some of the necessary conditions of a ZEV. AT PZEV include dedicated
compressed natural gas vehicles and
hybrid vehicles with engine emissions that meet PZEV standards. ;
ZEV (zero-emissions vehicle) :A ZEV has no tailpipe emissions. These include
battery electric vehicles and
hydrogen vehicles (
fuel cell vehicles). ==See also==