A level of standards for tailpipe emissions (hydrocarbon, carbon monoxide and oxides of nitrogen) enforced in California and states that have adopted California standards. A SULEV II vehicle meets the same smog-forming tailpipe emissions standards as a federal Tier 2 bin 2 vehicle.

Super Ultra-Low Emission Vehicle Liter, as in number of liters in the engine

Super Ultra Low Emission Vehicle (only a few vehicles qualify for this clean rating category, Prius is among them)