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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 earth's atmosphere consists of three main layers that differ in thickness and chemistry. The thickness of the innermost layer, the troposphere, decreases from the equator to the poles. The greatest amounts of ozone occur in the stratosphere.ost of the earth's ozone is contained in the stratosphere, a layer of the atmosphere 1040 km above the surface of the earth. The amount of ozone in the stratosphere is fairly constant when viewed globally. However, it changes throughout the year and from one place to another.