October 7, 2011. The U.S. Environmental Protection Agency said it has proposed changes to a rule that aims to cut smog-forming chemicals from power plants in 27 states. The changes could result in slightly more pollution, but save the measure's health benefits. The changes in the so-called Cross State Air Pollution Rule will result in the government issuing 1 percent more credits to allow industry to pollute in 10 states, which could result in 1.3 percent more of the emissions.