Air pollution
Our world is enveloped by a layer of the atmosphere about 15 km around the thick layer of the atmosphere contains water vapor, nitrogen, oxygen, dust. And microorganisms in the amount of these gases. The most important gases existence. Life on Earth is oxygen and the layer of the atmosphere with enough oxygen. To live with a thickness of 5-6 km. Which 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 a component of climate change to the amount of dust, gas, odor, smoke, steam, vapor, soot, and radioactivity in the atmosphere since. Too many of us call such conditions as "bad air" or "air pollution".
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