Moderate

Which of the following is not an important atmospheric pollutant?

Correct answer: C. CO2

  • A. CO
  • B. SO2
  • C. CO2
  • D. Hydrocarbons

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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