SACRAMENTO, Calif. — The country’s most populous state could become the first to require a portion of new truck sales be electric or “zero emission” vehicles as California grapples with how to clean up its worst-in-the nation air quality.

SACRAMENTO, Calif. — California’s governor has asked the attorney general to investigate why the state’s gas prices are so high, pointing to a new report suggesting big oil companies are “misleading and overcharging customers” by as much as $1 per gallon.