Question

Which of the following is not an air pollutant?

• A. ${\mathrm{N}}_2$
• B. ${\mathrm{N}}_2\mathrm{O}$
• C. $\mathrm{NO}$
• D. $\mathrm{CO}$

Answer 1

The correct option is A

${\mathrm{N}}_2$

Explanation for correct option:

A. ${\mathrm{N}}_2$

Air pollutant:

• Air pollutants are the mixture of solid as well as gaseous particles in the air.
• Some of the air pollutants are poisonous in nature.
• The common air pollutants are carbon dioxide, Nitrogen dioxide, Carbon monoxide, and many others.

Thus, Nitrogen gas is not considered an air pollutant as nitrogen is present in the atmosphere.

Explanation for incorrect options:

Nitrous oxide $\left({\mathrm{N}}_2\mathrm{O}\right)$, Nitric oxide $\left(\mathrm{NO}\right)$ as well as Carbon monoxide $\left(\mathrm{CO}\right)$ are air pollutants while Nitrogen $\left({\mathrm{N}}_2\right)$ is not an air pollutant. Thus, options B, C and D stand incorrect.

Hence, the correct option is A i.e. ${\mathrm{N}}_2$.