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The ozone layer is located in the stratosphere, a region of the atmosphere that is about 10 to 50 kilometers above the Earth. The stratosphere consists of approximately 90 percent ozone. Ozone has the chemical formula O3.
All layers of the atmosphere contain some ozone. The Ozone Layer is contained in the bottom of the stratosphere (this area is also called the tropopause). Concentration here is roughly 10 ppm (normal) to 3 ppm (hole).