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(C) Smog is a type of air pollution. Classical smog occurs in cool,humid climates and is a mixture of smoke,fog,and sulfur dioxide $(SO_2)$. Photochem

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Oxides of sulfur and nitrogen

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(C) Smog is a type of air pollution. Classical smog occurs in cool,humid climates and is a mixture of smoke,fog,and sulfur dioxide $(SO_2)$. Photochemical smog occurs in warm,dry,and sunny climates and is formed by the action of sunlight on nitrogen oxides $(NO_x)$ and hydrocarbons. Therefore,oxides of sulfur and nitrogen are the primary precursors for the formation of smog.

Smog is generally produced in the presence of which of the following?

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