Air Pollution is the presence of contaminants or Pollutant substances in the air that interfere with human health or welfare, or produce other harmful Environmental effects.

Other definition:
Air pollution is toxic or radioactive gases or particulate matter introduced into the atmosphere, usually as a result of human activity.

Other definition:
Air pollution is one or more chemicals or substances in high enough concentrations in the air to harm humans, other animals, vegetation, or materials. Such chemicals or physical conditions (such as excess heat or noise) are called air pollutants.

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[Houses and factories] (LOC) by The Library of Congress [Houses and factories] [between 1941 and 1942] 1 slide : color. Notes: Title devised by Library staff. Transfer from U.S. Office of War Information, 1944. Subjects: Industrial facilities Houses United States Format: Slides--Color Rights Info: No known restrictions on publication. Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc . . .