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This introductory text helps readers understanding what air pollution is, how it harms plants and animals, and how to help prevent it. Air pollution is the introduction of particulates, biological molecules, and many harmful substances into Earth’s atmosphere, causing diseases, allergies, and death to humans, damage to other living organisms such as animals and food crops, or the natural or built environment. Smog hanging over cities is the most familiar and obvious form of air pollution. But there are different kinds of pollution—some visible, some invisible—that contribute to global warming. Generally any substance that people introduce into the atmosphere that has damaging effects on living things and the environment is considered air pollution.