Our world is facing many major problems today. Most important of them is the pollution. Pollution are mainly of three types – air pollution, water pollution and sound pollution. Mixing of harmful gases in the earth’s atmosphere is known as air pollution. This is a big issue and all the nation of the world must think seriously about it. Pollution is caused by ejection of harmful gases from transports, factories, burning etc. We must use much of public transports instead of our personal transports. We must walk small distances. Chimneys of the factories must be opened high above atmosphere region. Another one is water pollution. Water of seas, ocean, lakes and rivers are polluted at a very rapid rate. Wastage of factories and houses are left in the seas, oceans, lakes, rivers etc. These wastes must be converted into some decomposable form so that it does not disturb the environment. Sound pollution is another form of pollution. Loudspeakers, traffic horns, machineries etc cause sound pollution. These types of pollution cause many types of diseases to humans. Not only humans other living beings are also suffering due to this. Many fishes die because they take many harmful substances due to water pollution. No of birds are also decreasing due to air pollution. Human’s ears are addicted to hear loud due to sound pollution. This is big threat and we must overcome it as soon as possible.