Question

How does the air become dirty?

Answer 1

Clean air is air that has no harmful levels of pollutants (dirt and chemicals) in it. ... When too much dirt and chemicals get into the air, the airis dirty or polluted. Dirty air is not good for people to breathe.
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Answer 2

the air becomes dirty due to these following causes-

~Natural sources like- radon gas , wildfire , volcano etc.

~human and industrial sources

~suspended particulate matter ( SPM )

~chlorofluorocarbons(CFC) or aerosols

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