Forty years ago, the nation made a commitment–in the form of the Clean Air Act—to cleaner air that would protect all Americans, especially our most vulnerable populations. Yet today, far too many American families are living and working in neighborhoods with dangerous levels of air pollutants that deteriorate their health and quality of life. One of the biggest impediments to health and well being is the air we breathe: 40,600 deaths per year are related to outdoor air risk factors and 13 percent of the country’s disease burden could be prevented by environmental improvements. And, the...