The Utah Department of Environmental Quality proposes to amend R 307-110-28, a rule addressing regional haze. These amendments would revise sulfur dioxide milestones and the existing backstop trading program to reflect changes to the federal regional haze rule. Comments are due July 31, 2008. http://www.rules.utah.gov/publicat/bull_pdf/2008/b20080701.pdf pp. 34-35.