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In brown-air cities atmospheric hydrocarbons and nitrogen oxides from automobiles and power plants react in the presence of sunlight, forming a single or a number of secondary pollutants as

Correct Answer: all of these.

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Biology MCQ: In brown-air cities atmospheric hydrocarbons and nitrogen oxides from automobiles and power plants react in the presence of sunlight, forming a single or a number of secondary pollutants as | Extra Education