What are California emissions standards?
According to the EPA for California, there is a table of emission standards that car owners can use to effectively determine what stardard their car is held to.Source: EPA
In order to protect air quality, California has developed its own emissions regulation system that has also been adopted by the states of Maine, Massachusetts, Vermont and New York. The California model emulates Tier I and Tier II systems, but adds categories such as Low Emissions Vehicle (LEV), Ultra Low Emissions Vehicle (ULEV), Super Ultra Low Emissions Vehicle (SULEV) and Zero Emissions Vehicle (ZEV). The current California emissions system in place is extremely strict in terms of oxides of nitrogen and particulate matter, which has been especially challenging for diesel vehicles.
