the nnun pollution derives from the verd 'to pollute'. "to pollute' means 'to poison'. Ecological disturbance by man is pollution. Man pollutes evironment for his selfish purposes. Pollution can be of different types air pollution, water pollution, noise pollution. Etc. Air pollution is caused by gases and smoke emitted by vehicles and factories. Water pollution is caused due to the dumping rivers and seas. Noise pollution is caused by creating noises bomb, firing of crackers din by industrial machines. Rushing of a motor bike or a truck, ect, pollute environment.