There are three main kinds of pollution- air pollution, water pollution, and noise pollution. Air, which is the most important element of our environment for our survival, can be polluted in many ways. Smoke in the air from mills, factories, and industry contains carbon monoxide, carbon dioxide, and methane, which are all poisonous gases. This leads to health problems and the thinning of the ozone layer, which protect us from harmful UV rays. Water is also polluted by the discharge of commercial and industrial waste into surface water. Sewage in drinking water is another cause of water pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be really unbearable.This kind of constant sound also causes headache and mental stress. People living next to a building site where there is too much noise can become sick, as they cannot sleep or relax. This is called noise pollution. 1.How important is the air in our survival? 2. What leads to health problems and the thinning of the ozone layer? 3.What are the causes of water pollution? 4.What are the affects of noise pollution?