Which of the following is not an important atmospheric pollutant?
Correct answer: D. CO2
- A. CO
- B. SO2
- C. Hydrocarbons
- D. CO2
Explanation
In the traditional list of major atmospheric pollutants, CO, SO2 and hydrocarbons are direct air pollutants, whereas CO2 is primarily treated here as a greenhouse gas. CO2 can contribute to environmental harm at elevated concentrations, but it is the intended exception in this classification.
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