What is air pollution? Make a flowchart to describe its causes and effects.

Air Pollution: In our atmospheric air, we have fixed amounts of various components like oxygen, nitrogen, carbon di oxide and all such gases. But due to Excessive use of combustion fuels and many other factors, this fixed amount is moving towards an imbalance. Moreover, some harmful substances like mercury and lead particulates are also present in the air. This phenomenon is termed as Air Pollution.