Define/Explain: Smog.

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(N/A) Smog is a type of intense air pollution that reduces visibility.
It is a combination of smoke and fog.
It is formed by the interaction of smoke,dust particles,water vapour,and various gases such as $SO_2$,$NO_2$,and $H_2S$ in the atmosphere.
There are two main types: Classical smog (reducing) and Photochemical smog (oxidizing).

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