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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.
Below are a few key effects of air pollution. The last page on FactSheet has some specific air pollution incidents that are worth checking out. Chemical reactions involving air pollutants can create acidic compounds which can cause harm to vegetation and buildings.