WASHINGTON—The U.S. Environmental Protection Agency will announce plans to propose new rules to significantly decrease emissions of smog-forming nitrogen oxide from diesel-powered heavy-duty trucks, an agency official said.
Industry groups and state environmental officials have urged the EPA to set new nationwide rules as the state of California has been moving forward with plans to set new state emissions limits. California also wants nationwide rules, in part because more than half of all trucks delivering goods in the state are registered in other states.
