Pollution means contamination of any environmental element from pollutants. there r many types of pollution like water pollution, air pollution, soil pollution etc. pollutions' main cause is human but sum natural factors like volcano will cause air pollution. pollution causes many problems in our lyf. for example, in delhi people r unable to breathe pure air and are becoming victims of respiratory problems. this is the situation in many developing and developed country like china also.
this can be controlled by 3Rs -- recycle, reuse and reduce