Biodegradable pollutants.

Pollutants which are easily decomposed by the bacteria or other microorganisms or by various environmental factors like waste of vegetables fruits, sewage, cow dung etc are called as biodegradable pollutants.

Non biodegradable pollutants.

Pollutants which are not easily decomposed by the bacteria or any other environmental factors and remains as such in the environment and pollutes it eg polythene, DDT, mercury, aluminium etc are called as non biodegradable pollutants.