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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.
The ozone layer, a fragile protective shield. The stratosphere is the portion of the atmosphere located at an altitude of in between 10 to 60 km. Within the stratosphere, the ozone layer is the portion that contains the highest proportion of ozone gas.