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Smog is apart of air pollution; it is formed when a layer of cool air is trapped beneath a layer of still warmer air. The mixture of substance is produced by the evaporation waste of hydrocarbons, combined with nitrogen dioxide, oxygen, and sunlight produce the photochemical smog, besides that optical effect it causes an increase of ozone in the lower atmosphere and the health conditions of the particular organism living in such an area.

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12y ago
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9y ago

it is caused by humans cars and other thing like chemicals

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Q: How air pollution is caused?
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