Multiple choice

Which is not a pollutant of air?

  1. Smoke

  2. Dust

  3. CO2

  4. SO2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide (CO2) is a natural component of the atmosphere and is essential for photosynthesis. While it is a greenhouse gas, it is generally not classified as a pollutant in the same sense as toxic particulates like smoke, dust, or sulfur dioxide.

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