Pollution is when something is added to the environment that is harmful or poisonous to living things. Smoke in the air from factories is a type of pollution as it is bad for the lungs when breathed in. Sewage in drinking water is another type of pollution, as it can make people unwell because it contains germs and viruses. 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.
Air pollution[change | edit source]
Air pollution is caused by harmful gases such as carbon dioxide, sulphur dioxide and nitrogen dioxide and very small particles of carbon. Most of the pollution is caused by factories, vehicles and livestock. Today air pollution has become dangerous to humans. Heavy air pollution may cause breathing problems such as asthma or other health problems.
Water pollution[change | edit source]
Water pollution is the presence of harmful materials in water, such as sewage, dissolved metals, waste from farms and factories and crude oil spilled from shipwrecked tankers. The three main substances that pollute water are nitrates from fertilisers, sewage and detergents. Pollution causes harm to organisms living in water and can also harm people's health, and can cause problems such as cancer.
Noise pollution[change | edit source]
The harmful noises in the environment, such as the sound of vehicles, loud speakers, etc. in a city is called noise pollution. Noise pollution can cause ear problems or even permanent deafness, especially to older people. Noise pollution can be defined as the unwanted sound present in the atmosphere.