Benefits of adopting California’s Advanced Clean Cars II regulations
Combustion engine vehicles emit climate-warming greenhouse gases (GHGs) and air pollutants that are harmful to human health. In August 2022, California adopted the Advanced Clean Cars II regulations to rapidly reduce light-duty vehicle emissions. The Advanced Clean Cars II regulations implement increasingly stringent standards for combustion vehicles while requiring an increasing number of new light-duty vehicle sales to be zero-emission. Specifically, the regulation requires least 68% of new light-duty vehicle sales be zero-emission by 2030 and 100% by 2035.
Section 177 of the Clean Air Act allows other pollution-burdened states to adopt California’s emission standards for new motor vehicles. The regulatory processes in each of these states require or would benefit from an extensive analysis of the environmental and public health impacts of increasingly stringent ZEV sales and tailpipe pollutant requirements over time.
Modeling by Sonoma Technology, Inc. (STI) quantified the emissions reductions for sixteen states which, together with California, account for 37% of the 2022 U.S. light-duty vehicle market and are home to 38% of the U.S. population. The fact sheets and data below provide state-level information on the benefits of adopting California’s Advanced Clean Cars II regulation.