The document defines air pollution and discusses its sources and effects. It provides definitions of air pollution from Perkins and others. It discusses point and non-point sources of pollution, including vehicles, fossil fuel combustion, and population growth. Specific pollutants like carbon monoxide, sulfur dioxide, nitrogen oxides, mercury, and lead are examined along with their sources and health impacts. The harmful effects of air pollution on materials are outlined. Control methods discussed include source correction in industry, cleaning gaseous effluents using absorption, adsorption, and particulate controls like cyclones and fabric filters.