Mercury and air toxins: Rules due this week to control mercury and other toxic emissions.
Cross-state air pollution: A cap-and-trade system to reduce soot and smog-causing emissions in Eastern states. Effective Jan. 1, but still being revised.
Regional haze: Rules to reduce pollution-caused haze over U.S. parks and wilderness areas, including the Boundary Waters Canoe Area. Decisions on implementation expected next year.
Carbon dioxide: First regulations for greenhouse gas expected early next year.
Source: U.S. Environmental Protection Agency, Minnesota Pollution Control Agency