Most ozone gas (about 90%) is located in the atmospheric layer of
ionosphere
troposphere
stratosphere
mesosphere
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Answer is Wrong!
This question was previously asked in
UPSC CDS-2 – 2017
The vast majority of ozone gas (approximately 90%) is concentrated in the stratosphere, forming the ozone layer. This layer is crucial for absorbing most of the Sun’s harmful ultraviolet (UV) radiation. A smaller amount of ozone exists in the troposphere, where it acts as a pollutant and a greenhouse gas.