LOS ANGELES -- The clock is running out on California's Clean Air Vehicle Decal program. You may have seen the colorful stickers on eligible vehicles riding in the HOV lanes.

SACRAMENTO, Calif. — The clean air rules the California Air Resources Board recently updated, which were expected to raise gas prices in the state, are officially on hold.

A regional air quality alert has been issued for parts of Southern California as two fires continue to burn in Riverside County, prompting officials to warn thousands of residents to remain ...

The Senate voted on May 22 to block California’s first-in-the nation rule banning the sale of new gas-powered cars by 2035.

In a maneuver of dubious legality, congressional Republicans revoked a six-decade tradition of letting California set its own air-quality and auto-emission standards, in order to stop an all-EV ...