The majority of atmospheric ozone is found concentrated in a specific layer of Earth's atmosphere.
The atmosphere is divided into several layers based on temperature trends. These include the Troposphere (lowest layer), Stratosphere, Mesosphere, Thermosphere, and Exosphere. The ozone layer is predominantly situated within the lower to middle portion of the Stratosphere, typically between 15 to 35 kilometers (9 to 22 miles) above the Earth's surface.
Therefore, the Stratosphere is the atmospheric layer where most ozone is concentrated.