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 ill because it contains germs andviruses. People living next to a building site where there is too much noise can become sick as they cannot sleep orrelax. This is called noise pollution.Air pollution is caused by harmful gases such as carbon dioxide, sulphur dioxide,nitrogen dioxide carbon monoxide 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 causebreathing problems such as asthma or other health problems.Increase in human activities has also polluted air. Water pollution is the presence of harmful materials in water, such assewage, dissolved metals, waste fromfarms and factories and crude oil spilled from shipwrecked tankers. The three main substances that pollute water arenitrates from fertilisers, sewage anddetergents. Pollution hey causes harm to organisms living in water and can also harm people’s health, and can cause problems such as cancer.
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.
Soil pollution pertains to the contamination of the soil due to man-made chemicals such as hydrocarbons, heavy metals, solvents, and the like. These chemicals come mainly from industrial activities, and also from improper waste disposal. Soil pollution poses various health risks, as the chemicals can produce harmful vapors, or they can contaminate the water supplies located directly under the polluted soil.