Our world is enveloped by a layer of the atmosphere, about 15 km thick layer of the atmosphere consists of nitrogen, oxygen, such as dust and water vapor. And microbes in the amount of these gases. The most important gases to its existence. Life on Earth is oxygen and the layer of the atmosphere with enough oxygen. To live a thickness of only 5-6 km. This usually consists of various gases is relatively stable nitrogen 78.09% 20.94% oxygen, carbon dioxide and noble gases. 0.97% in fixed quantity of such gas, we hold that the fresh air, but whenever the air component to the amount of dust, gas, odor, smoke, vapor, water vapor, soot, and the radioactivity in the atmosphere since. Too many of us call such conditions as "bad air" or "air pollution".
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