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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.
Some of the main causes of pollution and their effects, according to the World Wildlife Fund and the United States Environmental Protection Agency, are as follows: Air pollution can impact the health of people and animals, as well as damage trees and plants. It can also impact on waterways including lakes, and it damages man-made structures like buildings. Air pollution can also cause acid rain. Toxic chemicals can cause disease and death in animals, birds and humans.