Air Pollution: The Silent Killer
By Leila Waid. Air pollution poses a major risk to human health and is the fourth leading cause of death globally. Although air pollution regulations, such as the Clean Air Act, have drastically reduced the number of deaths and illnesses in the United States, there is still an unacceptably large number of deaths from air pollution. For example, two in five Americans live in areas that are above the threshold for safe air pollution exposure, as set by the EPA. Air pollution refers to particles, gases, and contaminants not found in pure