Answer:
Step-by-step explanation:
Air pollutants :-
The harmful chemical substances that cause pollution to the environment are known as Air pollutants.
Primary air pollutants :-
The chemical substances which can directly enter the air by natural or human activities are known as primary air pollutants. it includes Carbon oxides, Nitrogen oxides, etc.
CO is produced by Transportation, petroleum, paper industries, iron and steel industries, etc.