New Mexico is cruising into the legal fight over California's "clean car" program. The state and local air-quality boards voted about midnight Tuesday to enact strict low-emission standards for new cars and trucks. But the sweeping regulations already face a legal challenge from the auto industry and four state lawmakers. Their lawsuit— filed earlier Tuesday, before the regulations had been adopted— says the state Environmental Improvement Board lacks authority to adopt the regulations. If successful, the suit could result in the pollution regulations going before the Legislature next year. "The point is not whether those emission regulations are a good...