Which of the following is not a natural source of air pollution ?
Correct answer: D. None of these
- A. Volcanic eruptions and lightening discharges
- B. Biological decay of vegetable matter
- C. Photochemical oxidation of organic matter
- D. None of these
Explanation
Volcanic activity, lightning, biological decay, and naturally occurring photochemical reactions can all contribute to air pollution. Therefore none of the listed processes is excluded as a natural source.
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