Choose the compound that is always present in photochemical smog:
Correct answer: A. O3
- A. O3
- B. CO
- C. CO2
- D. SO2
Explanation
Photochemical smog is characterized by its high concentration of oxidants, the most abundant of which is ozone (O3). This ground-level ozone is formed from the reaction of nitrogen oxides and volatile organic compounds in the presence of sunlight.
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