Question

what is air pollution

Answer 1

introduction into the air of a substance which has harmful or poisonous effects is called air pollution 

hope it helps........:-)

Answer 2

Air pollution can be defined as the presence of toxic chemicals or compounds in the air, at levels that pose a health risk.In an even broader sense, air pollution means the presence of chemicals or compounds in the air which are usually not present and which lower the quality of the air or cause detrimental changes to the quality of lie.