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Explain what is smog. Give its effects.

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Smog is a photochemical haze or smoky mist caused by the action of solar UV radiation on the atmosphere, which is polluted by primary pollutants. Secondary pollutants such as formaldehyde, aldehydes, and peroxyacetyl nitrate (PAN) collectively form smog. 

Effects of smog: 

(i) It reduces visibility. 

(ii) It is highly suffocating and toxic.

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