New York Attorney General Letitia James is leading a coalition of six states and New York City in a lawsuit against the U.S. Environmental Protection Agency for allegedly failing to regulate interstate smog pollution, her office announced on Thursday.

The lawsuit, filed in the U.S. Court of Appeals for the District of Columbia Circuit, challenged a rule created last year by the EPA that allows states whose smog travels into New York to take no further action to cut down on that pollution.