There are two types of sources of pollution on the basis of emissions or discharge of pollutants.
a) Point Source Pollution.
b) Non-point Source Pollution.
a) Point Source Pollution:
The sources that are located at specific places and discharge pollutants at specific locations through sewer pipes, smokestacks, exhaust pipes, drain pipes into air, water bodies or soil are called point sources.
Examples: Drain pipes of factory, exhaust pipe of an automobile and the smokestack of industrial plant.
b) Non-point Source Pollution:
The discharge of pollutants into air, water or soil at non-specific locations are called non-point source pollution.
Examples: Run-off of pesticides and fertilizers from agricultural fields and emissions from open biomass burning.