California Air Resources Board

For more than 50 years, the California Air Resources Board (CARB) has led in setting standards to reduce harmful pollution from cars, pickup trucks, and SUVs. These efforts have delivered cleaner air, improved public health, and sparked innovation that benefits drivers everywhere.

Still, California suffers from some of the worst air pollution in the nation. For example, five of the 10 most polluted cities in the U.S. are in California, and two air basins in California, South Coast and San Joaquin Valley, are designated as in “extreme nonattainment” for ozone, which means about half of all Californians live in areas with air that is dangerously polluted. These communities face higher rates of asthma and heart and lung disease, which contribute to shorter life expectancy. Meanwhile, climate change is increasing wildfires, drought, floods, heat events, and the ease with which ozone and particulate matter form in California. Hence, more work is needed to reduce emissions in California.

A New Phase of Vehicle Standards

In response to illegal federal actions purporting to revoke California’s Clean Air Act waiver for the enforcement of the Advanced Clean Cars II regulations, Governor Gavin Newsom signed Executive Order N-27-25 on June 12, 2025. This order reaffirms the State’s commitment to cut harmful air pollution from transportation and protect public health.

CARB staff has begun a new phase of work that includes light-duty vehicle emissions standards to reduce criteria air pollutant, greenhouse gas, and toxic emissions consistent with State and federal law. Please visit the Meetings & Workshops page for upcoming events.

Why Action Now Matters

Vehicle pollution remains the largest source of air pollution in the state. California cannot meet its air quality and climate obligations without further reductions in emissions from vehicles. Without action, Californians most affected by poor air quality and climate change will continue to be disproportionately impacted. California’s climate resilience in the face of ever-growing emergencies such as floods, fires, droughts, and extreme heat depends on decisive action to reduce vehicle emissions. 

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