CDS 2017 PYQ with Answer — Most Ozone gas (about 90%) in the atmospheric layer of

2017 · Q21

Most Ozone gas (about 90%) in the atmospheric layer of

General KnowledgeGeography

Aionosphere
Btroposphere
Cstratosphere
Dmesosphere

Explanation

About 90% of atmospheric ozone is concentrated in the ozone layer within the stratosphere, roughly 15–35 km above the surface, where it absorbs harmful solar ultraviolet radiation. The troposphere holds only about 10% of atmospheric ozone. The ionosphere and mesosphere contain negligible amounts of ozone. The stratosphere is therefore the correct atmospheric layer.