Smog is formed through a reaction with sunlight, nitrogen oxides, and hydrocarbons, producing .

Visible brown haze.

Explanation:

Smog is a type of smog produced when ultraviolet light from the sun reacts with nitrogen oxides in the atmosphere.

It is visible as a brown haze, and is most prominent during the morning and afternoon, especially in densely populated, warm cities.

Man-made smog is derived from coal combustion emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photochemical reactions of these emissions.

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