(brown color) is a mixture of primary and secondary pollutants formed under the influence of UV radiation from the sun; formation of this smog begins when exhaust from morning commuter vehicles releases large amounts of NO and VOCs into the air over a city• VOCs + NOx + heat + sunlight → ground level ozone (03) + other photochemical oxidants + aldehydes + other secondary pollutants

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1.
(brown color) is a mixture of primary and secondary pollutants formed under the influence of UV radiation from the sun; formation of this smog begins when exhaust from morning commuter vehicles releases large amounts of NO and VOCs into the air over a city

• VOCs + NOx + heat + sunlight → ground level ozone (03) + other photochemical oxidants + aldehydes + other secondary pollutants