Air

Air pollution

Air pollution is the introduction of airborne chemicals, particulate matter or biological materials that cause harm or discomfort to organisms. The population growth, industrialization and motorization of humansocieties have significantly increased the amount of airborne pollutants in the Earth's atmosphere, causing noticeable problems such as smog, acid rain and pollution-related diseases. The depletion of the stratosphericozone layer, which shields the surface from harmful ionizingultraviolet radiation, is also caused by air pollution, chiefly from chlorofluorocarbons and other ozone-depleting substances.