Air pollution occurs when harmful or excessive quantities of substances including gases, particles, and biological molecules are introduced into Earth`s atmosphere. It may cause diseases, allergies and even death to humans; it may also cause harm to other living organisms such as animals and food crops, and may damage the natural or built environment. Both human activity and natural processes can generate air pollution.
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activity air allergies also animals are atmosphere biological both built can cause crops damage death diseases earths energy environment even excessive food gases generate harm harmful human humans introduced living may molecules natural occurs organisms other particles pollution processes quantities substances such when
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