pratima206

pollution Pollution is the introduction of harmful materials into the environment .These harmful materials are called pollutants . pollutants can be natural such volcanic ash .they can also be created by human Activity. There are 4 types of pollution: Air pollution: source: smile from industries, vehicles, burning of waste etc... Water pollution: source: water from industries, dumping of house hold waste, dumping medical equipment etc.... Land pollution :source: waste from industries dumping of used medical  equipment ,etc... Noise pollution: source: construction activities, events ,war, transportation ,etc...