The document provides an overview of air pollution, including natural and human-caused sources of pollution, conventional and unconventional pollutants, effects of indoor and outdoor air pollution, and efforts to control air pollution through legislation. Key topics covered include the major conventional pollutants regulated by the Clean Air Act like sulfur dioxide, nitrogen oxides, and particulate matter; unconventional pollutants like noise and light pollution; and international agreements like the Montreal Protocol to regulate pollutants that deplete stratospheric ozone.