Half of all Americans live in places with unsafe levels of air pollution. Air pollution triggers millions of asthma attacks each year and contributes to other serious health problems, particularly among children, senior citizens and other sensitive groups. Air pollution also creates the haze that hangs over city skylines and our national parks. We are working to clean up smog, fine particle soot, mercury and other toxic air pollutants from the biggest sources, including power plants, cars and trucks, and industrial plants.
