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Releasing of toxic and harmful materials into the surroundings is known as pollution.there are 4 types of pollution:-
1.air pollution-air pollution is caused due to the vehicles,factories releasing smoke into the air.it can cause many sorts of lungs diseases
2.noise pollution-noise pollution is caused due to excess volume of TV,loud speakers etc.it can cause deafness and hearing problems
3.land pollution-it is caused due to dumping of garbage on land and making it dirty.it can cause health problems 
4.water pollution-water pollution is caused due to dumping waste materials into the water,washing vehicles etc.it can cause many problems like cholera dysentery,diarrhoea etc.
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