noun
the presence in or introduction into the air of a substance which has harmful or poisonous effects
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Air pollution is a pressing environmental issue that requires immediate attention from policymakers.
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The air pollution in this city is so bad, I can hardly breathe outside.
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Dude, the air pollution here is off the charts, we need to get out of this place.
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The toxic relationships in her life were like the air pollution, suffocating and hard to escape.