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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.
Ozone is found primarily in two regions of the atmosphere. the troposphere, the region closest to Earth (from the surface to about 10â16 kilometers (6â10 miles)). (about 90%) resides in the stratosphere between the top of the troposphere and about 50 kilometers (31 miles) altitude.