Multiple choice

Which of the following acts as a catalyst in the formation of photochemical smog?

  1. Ultraviolet light

  2. Sulfur dioxide

  3. Ground level ozone

  4. Radioactive pollutants

  5. Chlorofluorocarbons (CFCs)
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A Correct answer
Explanation

Modern smog does not usually come from coal but from vehicular and industrial emissions that are acted on in the atmosphere by ultraviolet light from the sun to form secondary pollutants that also combine with the primary emissions to form photochemical smog.

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