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(B) Photochemical smog results from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produced by automobiles and large manufactu

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Oxidizing Smog

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(B) Photochemical smog results from the action of sunlight on unsaturated hydrocarbons and nitrogen oxides produced by automobiles and large manufacturing factories. Photochemical smog has a high concentration of oxidizing agents and is therefore called oxidizing smog. Peroxyacetyl nitrate $(PAN)$ is formed by hydrocarbons in polluted air and is a characteristic component of oxidizing smog.

Which among the following has the highest concentration of $PAN$?

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