California regulators have passed new rules requiring zero-emission trucks to be the only medium and heavy-duty vehicles sold in the state by 2035. Existing fleets will also need to transition to zero-emission vehicles, with big rigs, local delivery vehicles, and government fleets transitioning by 2035, garbage trucks and local buses by 2039, and sleeper cab tractors and specialty trucks by 2042. The rule also comes with reductions in truck pollution. California is the only US state with permission to establish its own emission standards for motor vehicles. Many businesses and utilities have raised concerns about purchasing the required zero-emission vehicles, while environmentalists have welcomed the state’s decision. The California Air Resources Board estimates that the reduced pollution from the truck rules will save $26.6bn in health savings and $48bn in trucking operating costs. The board argues that 135 models of zero-emission trucks are being manufactured, and incentives will be available for new vehicles and infrastructure. The new rules follow recent decisions to require that an increasing percentage of annual truck sales in California be zero-emission vehicles and to ban sales of new gasoline cars by 2035.