The state of New York has adopted California’s vehicle-emission standards that 10 percent of cars, light trucks, and sport/utility vehicles sold starting with the 2004-model year must emit little or no air pollution, reports the Associated Press. Of the 10 percent, 40 percent must be zero-emission vehicles; 60 percent may be hybrid-electric cars that produce very low emissions. The state’s environmental board has given its final approval to the new guidelines, which also require diesel engines to meet the same emissions standard as gasoline engines. About 15 percent of all vehicles sold in the U.S. each year are sold in California and New York. Massachusetts, Maine, and Vermont are also considering adopting California’s vehicle-emissions program. New York officials say adopting California’s rules is part of its goal to cut emissions by 50 percent by 2020.