SACRAMENTO, Calif. (AP) — California regulators approved new rules that would force automakers to sell more electric work trucks and delivery vans in the state. The rule is aimed at helping the nation’s most populous state clean up its air quality. The rules would require a certain percentage of work truck sales each year to be zero-emission vehicles. Board chair Mary Nichols said it will be transformational for the state. The Truck and Engine Manufacturers Association opposes the rule, arguing the change won’t work without requiring companies to buy more electric trucks. Supporters nationwide called into the board on Thursday to support the measure.