In which layer of the atmosphere is the highest concentration of ozone found ?
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stratosphere

Most ozone (about 90%) is found in the stratosphere, which begins about 10–16 kilometers (6–10 miles) above Earth's surface and extends up to about 50 kilo- meters (31 miles) altitude. The stratospheric region with the highest ozone concentration is commonly known as the “ozone layer” (see Figure Q1-2).

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Ozone is mainly found in the stratosphere ( about 90% of it). I hope this helps!

5.4%

explanation:

their acceptance rate is 5% percent and the graduation rate is 98%