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An ultra-low-emission vehicle (ULEV) is a motor vehicle that emits extremely low levels of motor vehicle emissions compared to other vehicles. In some jurisdictions it is defined in law; low and ultra low emission vehicles may be given tax or other advantages, [1] while high emission vehicles may suffer restrictions or additional taxation.
Except some hybrids and alternative-fuel vehicles, PZEVs do not inherently offer consumers any kind of incentives other than the extended emissions warranty. In particular, PZEV vehicles do not automatically qualify for the hybrid vehicle tax credit or for the "clean air vehicle" decal that used to allow hybrid car drivers to use car-pool lanes ...
The SULEV standard is stricter than the standard for LEV (low emission vehicle) and ULEV (ultra-low-emission vehicle), however not as strict as PZEV (partial zero-emissions vehicle) which meets the SULEV standard for tailpipe emissions, but has zero instead of reduced evaporative emissions.
The PZEV and AT-PZEV ratings are for vehicles which achieve a SULEV II rating and also have systems to eliminate evaporative emissions from the fuel system and which have 150,000-mile/15-year warranties on emission-control components. Several ordinary gasoline vehicles from the 2001 and later model years qualify as PZEVs.
144 V Nickel-metal hydride batteries with 6.0 Ah capacity. Honda Multimatic S continuously variable transmission or 5-speed manual transmission. ULEV or AT-PZEV certification by the California Air Resources Board (CARB). Low rolling resistance tires (P185/70R14) on aluminum wheels and regenerative braking. Electric power-steering.
The 2006 model has also been rated an AT-PZEV vehicle. AT-PZEV (Advanced Technology-Partial Zero Emissions Vehicle) is an emissions standard created by the California Air Resources Board. 2005 model year Accord Hybrids were rated LEVII-ULEV by the California Air Resources Board and Tier2, Bin5 by the EPA.
In 2004, the European Parliament adopted Stage III/IV standards. The Stage III standards were further divided into Stage III A and III B, and were phased in between 2006 and 2013. Stage IV standards are enforced from 2014. Stage V standards are phased in from 2018 with full enforcement from 2021.
In the United States, PZEV (Partial Zero Emissions Vehicle) configurations are available for all 4-cylinder engines and V6 i-VTEC VCM engines with 5-speed automatic transmission. PZEV engines include 2 modes of exhaust valve operation.