Question

Which of the following is not an air pollutant ?

• A. $N_2$
• B. $N_{2}O$
• C. $NO$
• D. $CO$

Answer 1

The correct option is A $N_2$

$N_2$ is not an air pollutant because nitrogen is a fairly non-reactive gas that does not readily react with materials. Moreover, it is not a greenhouse gas because it does not absorb or reflect heat waves to any significant degree. Other gases mentioned in the question either absorb or reflect heat waves.