Which of the following is a manmade source of air pollution ?
Correct answer: D. Automobile exhaust
- A. All A., B. and C.
- B. Forest fire
- C. Bacterial action in soil and swamp areas
- D. Automobile exhaust
Explanation
Automobile exhaust is a clearly manmade source, releasing pollutants such as carbon monoxide, nitrogen oxides and hydrocarbons. Forest fires and bacterial activity in soil or swamps are generally classified as natural sources.
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