June 30, 2011
A Washington federal judge on Thursday dismissed a suit demanding the U.S. certify that certain power plants cause haze pollution, siding with the federal government's decision to hold off on a final determination until the plants complete efforts to limit pollution.
April 12, 2011
Two Arizona utilities and an entity that controls a canal in the state won approval Tuesday to intervene in a suit demanding the U.S. government certify that their coal-fired power plants cause haze pollution.