Pollution is the introduction of harmful matérials into the environnement these harmful materials are called Pollutans and cause adverse changes in the climate Pollution is the largest environnemental cause of diseases .it also affects the quality of life more than one can imagine there are several types of Pollution like air pollution and water pollution etc
Pollution can be classified according to different criteria, in particular those based on the nature of the polluting agent; ecological considerations and purely toxicological considerations