Any substances which pollute the air is called _____
Therefore, any substances which pollute the air is called air pollutant.
When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________. (air pollution, harmful, living, unwanted, non-living, pollutants).
What is a combination of substances called which remain intact with each other in any proportion?