The California Air Resources Board (ARB) has certified the Chevrolet Volt as meeting California LEV-II ULEV (EPA Bin 4) emissions standards. For bi-, dual- or flex-fueled vehicles, the certification is based on the results testing with gasoline fuel—i.e, in this case, when the Volt’s range-extending engine is operating.
Under California’s LEV-II, there are three sets of increasingly more stringent emission standards: LEV, ULEV, and SULEV. PZEV (partial zero emission vehicle) has the same test emission levels as SULEV, but also includes additional evaporative emissions control and a 150,000 mile/15 year emission durability requirement.
|ULEV standard is highlighted in yellow. Source: ARB. Click to enlarge.|
Based on the certification, it appears that the Volt met or exceeded SULEV requirements in most areas, with the notable exception of CO. Volt was certified to 1.3 g CO/mi. ULEV standard is 2.1 g/mi; SULEV requirement is 1.0 g/mi. The CO levels might be related to engine cold starts; GCC has asked GM for comment.
Tony Posawatz, the Vehicle Line Director for the Chevrolet Volt, had earlier said that an AT-PZEV package for the Volt would be coming, following its market introduction.
|Volt emissions. STD=ULEV standard, CERT=certification for the vehicle. Source: ARB. Click to enlarge.|
(A hat-tip to Dennis!)