The EPA based its decision on thoughts that the state is not doing enough to improve visibility, enforce emission limitations, and regulate polluters, such as coal-fired power plants and smelters.
Eric Massey, air quality division director for the Arizona Department of Environmental Quality, said the state disagrees with the EPA's decisions.
“We have the option to accept that and wait for a federal implantation plan," Massey said. "We also have the option to appeal the decision. We haven’t made a decision as to the direction we are going."
The EPA has until early September to release its own alternatives to the state’s plans.