Short Paragraph on Air Pollution!
Air is a mixture of several gases. The main gases are nitrogen (78.09%) for forming products such as, fertilizers for plants and for making the air inert, oxygen (20.95%) for breathing and carbon dioxide (0.03%) for photosynthesis.
Some other gases like argon, neon, helium, krypton, hydrogen, ozone, zenon and methane are also present.
Besides, water vapours and dust particles make their presence felt in one way or the other.
Air is most essential for all types of life in the biosphere because it helps in breathing. Man can live without food for a few weeks, without water for a few days but he cannot live without air even for a few minutes. A person breathes 22,000 times a day inhaling about 16 kg of air. It is mostly the oxygen which is consumed while carbon dioxide is released during the breathing process.
The atmospheric air is recognised as clean when there are no drastic variations in its natural composition and it is devoid of any solid particulate matter. It must be borne in mind that we cannot find clean or pure air in any part of the world because it is constantly being polluted both by nature and man.
When we breathe not only oxygen but some other gases such as sulphur dioxide, hydrogen sulphide, carbon monoxide, dust particles, emissions from volcanoes, etc. also enter our respiratory system. Thus air becomes polluted when its normal composition is disturbed either by nature or by man or by both.
World Health Organisation (WHO) has defined air pollution as limited to situation in which the outdoor ambient atmosphere contains materials in concentration which are harmful to man and his surrounding environment. In simple words air pollution refers to the injection into the atmosphere of gases, liquids and solid particles detrimental to human health. Air pollution knows no political boundaries, it is a global phenomena.