Define the following terms :

(i) pollution

(ii) pollutant

(iii) air pollution.

(i) Pollution is defined as the effect of undesirable changes in our surroundings that have a harmful effect on plants, animals and human beings.

(ii) Pollutants are toxic and otherwise harmful substances that have an undesirable impact on the different components of the environment and life forms.

(iii) Air pollution means degradation of air quality due to the increase in the concentration of harmful contaminants that affects human, plant and animal lives.