Mobile Sources Program - Consumers Portal

This page last reviewed August 12, 2013

car buyer The Air Resources Board sets engine standards for mobile sources in California. This includes everything from diesel trucks and buses to lawn and garden equipment. Cleaner gasoline and diesel fuels, in combination with tighter engine standards make cars and other mobile sources in California the cleanest in the world. Although, it is important to recognize that emission levels still vary between vehicles due to differences in emissions standards and emission reduction technologies. So, stay informed and make the clean air choice.

If you have questions or see a smoking vehicle call 1-800-END-SMOG.

What's New:
  • If you are thinking of buying a new car in California, our website provides environmental ratings on all cars certified in California starting in 2000.
  • The Plug-in Electric Vehicle (PEV) Resource Center is a buying guide dedicated completely to vehicles that plug-in.
  • All vehicles are required to display the Fuel Economy and Environment Label that will help you choose the cleanest, most efficient vehicle.

Frequently Asked Questions: