Which of the following is not an air pollutant?

Which of the following is not an air pollutant?
  1. $\mathrm{N}_2$
  2. $\mathrm{N}_2 \mathrm{O}$
  3. NO
  4. CO

Solution

Nitrogen gas is present in air upto $78 \%$ by volume. It does not cause pollution.

Asked in: AP EAMCET 2005

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