California has made major progress on air quality, but its geography and persistent pollution challenges mean the work isn’t over. The state must continue cutting vehicle emissions to meet national air quality standards, fulfill state goals, and fight climate change.

• Transportation is responsible for about 40% of greenhouse gas emissions and 60% of the state’s criteria and smog-forming pollutants.
• California has 5 of the 10 most polluted cities in the U.S.
• 10 million Californians live with air that U.S. EPA has determined is among the worst in the nation.
• People who live in these areas suffer unusually high rates of asthma, heart and lung disease and often die prematurely.