President Barack Obama will issue new vehicle emission standards and pair them with a broader goal of reducing pollution, marking the first time limits on greenhouse gases will be linked to federal standards for cars and trucks.
Officials familiar with the administration's discussions say Obama will unveil the new standards on Tuesday. The officials spoke on condition of anonymity because the official announcement had not been made.
California, 13 other states and the District of Columbia have urged the federal government to let them enact more stringent standards than the federal government's requirements. The states' regulations would cut greenhouse gas emissions by 30 percent in new cars and trucks by 2016.
Officials said Tuesday's announcement moves toward the 30 percent goal by 2016, starting with model years 2011 and beyond.
Obama's move also would effectively end litigation between states and automakers, who sought to block state-specific rules. The new federal rules would prompt automakers to drop their lawsuit. Two car companies who have been part of the litigation, General Motors and Chrysler, have received billions in government loans during a dramatic downturn in car sales and weakened economy.
A March 2008 decision prevents states from setting their own limits on greenhouse gas emissions from automobiles, but Obama has ordered the U.S. Environmental Protection Agency to reconsider the ruling.