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  4. The brown haze of photochemical smog is largely attributable to:

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Q. The brown haze of photochemical smog is largely attributable to:

Environmental Chemistry

Solution:

Photochemical smog is initiated by the photochemical dissociation of $NO _{2}$ that result in the formation of NO. This NO rapidly reacts with $O _{3}$ to give $NO _{2}$ (brown gas), responsible for causing haze if its concentration is very high.

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