Question

How can carbon dioxide be considered a pollutant when it is a natural component of air?

Answer 1

Answer:

High levels of $CO_2$ acts as pollutant in the atmosphere.

Explanation:

Carbon dioxide is a natural component of air. It is produced by the human body metabolism and by other factors. However, concentrations reaching above normal levels is considered to be as a pollutant.

Carbon dioxide is produced as a byproduct of many industrial and commercial chemical synthesis. This emission directly reaches in the air and causes high levels of concentration in the atmosphere.

High levels of $CO_2$ causes greenhouse effect, acid rain as well as global warming and thus, it is considered to be as a pollutant.