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