General Science • ChemistryMedium
What is the primary gaseous pollutant responsible for causing photochemical smog under solar radiation?
A. Carbon dioxide
B. Nitrogen oxides and volatile organic compounds✓ Correct Answer
C. Sulfur dioxide
D. Chlorofluorocarbons
💡 Solution & Explanation
Photochemical smog forms when ultraviolet solar radiation acts upon nitrogen oxides and volatile organic compounds released primarily by vehicular exhaust and industrial emissions. Carbon dioxide is a primary greenhouse gas rather than a direct precursor to secondary smog pollutants, whereas sulfur dioxide is mainly associated with industrial London-type reducing smog.
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