The atmosphere consists of nitrogen, oxygen, water vapor and dust. And various microbial gas, the most important of its existence. Life on Earth is oxygen and the layer of the atmosphere with enough oxygen. To live with a thickness of only 5-6 kilometers. This usually consists of various gases is relatively stable nitrogen 78.09%, 20.94% oxygen, carbon dioxide and noble gases. 0.97% of the amount fixed It is the fresh air, but whenever a component of climate change to the amount of dust, gas, odor, smoke, vapor, vapor, soot, and the radioactivity in the atmosphere since excessive, we call this condition as "bad air" or ". air pollution"
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