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Air pollution is the introduction of particulates, biological molecules, or other harmful materials into Earth's atmosphere, causing diseases, allergies, death to humans, damage to other living organisms such as animals and food crops, or the natural or built environment.
Man-made air pollution can have serious human health effects. Photo Credit Design Pics/Design Pics/Getty Images. Air pollution can have both man-made and natural sources. The Eyjafjallajokul volcano in Iceland and Mount St. Helen in Washington illustrate the effect of natural causes of air pollution. However, humans continue to negatively impact their environments and contribute to air pollution.