Most ozone gas (about 90%) is located in the atmospheric layer of

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ionosphere

troposphere

stratosphere

mesosphere

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This question was previously asked in

UPSC CDS-2 – 2017

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The correct option is C) stratosphere.

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.

The atmosphere is divided into several layers: troposphere (lowest), stratosphere, mesosphere, thermosphere, and exosphere. The ionosphere is a region within the thermosphere and exosphere where gases are ionized by solar radiation. Ozone formation and destruction primarily occur in the stratosphere.

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