Ozone hole is a region over :

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the Antarctic caused mainly by CFC gases.

the Antarctic caused mainly by carbon dioxide gas.

the Arctic caused mainly by CFC gases.

the Arctic caused mainly by carbon dioxide gas.

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UPSC CDS-2 – 2024

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The ozone hole is a region over the Antarctic caused mainly by CFC gases.

The “ozone hole” refers to the dramatic thinning of the stratospheric ozone layer that occurs annually over Antarctica during the Southern Hemisphere spring (August-October). This severe depletion is primarily driven by catalytic reactions involving chlorine and bromine atoms released from synthetic ozone-depleting substances (ODS) like chlorofluorocarbons (CFCs) and halons, which accumulate in the stratosphere and are activated under the extremely cold conditions and sunlight present in the Antarctic polar vortex.

While some ozone depletion also occurs over the Arctic, it is generally less severe and variable due to different meteorological conditions. Carbon dioxide (CO₂) is a greenhouse gas that contributes to global warming but is not a direct cause of stratospheric ozone depletion; in fact, increasing greenhouse gases can even cool the stratosphere, potentially influencing ozone chemistry in complex ways.

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