The day after an article highlighted weak enforcement, Iowa's attorney general takes on a source of toxic emissions.

Pulp mills emit hazardous pollutants that have been linked to heart and lung disease

The EPA is poised to issue a new regulation restricting toxic power plant emissions

The EPA releases details of a landmark rule to cut air emissions of mercury and other toxics from coal- and oil-fired power plants.

As communities battle toxic air, industry shapes EPA and state regulation.

Q&A with the man some call "the next EPA administrator" if Romney wins the White House.

Regulators in Maine and nearby states have taken months and even years to sanction facilities violating the Clean Air Act

Environmental group condemns eight utility companies for spending millions to lobby against pollution controls.