Ozone hole is a region over:

The 'ozone hole' refers to the severe depletion of stratospheric ozone specifically over the Antarctic continent [2]. This phenomenon occurs annually during the austral spring (September and October) when sunlight returns to the region [6]. The primary cause is the presence of chlorofluorocarbons (CFCs), which are human-made chemicals used in refrigeration and aerosols [2]. These CFCs drift into the stratosphere and release chlorine atoms that catalytically destroy ozone molecules [7]. While ozone depletion can occur over the Arctic, it is generally less severe and more irregular because the Arctic stratosphere is typically warmer, preventing the consistent formation of polar stratospheric clouds necessary for the chemical reactions [5]. Carbon dioxide is a greenhouse gas that contributes to global warming but is not the primary chemical agent responsible for the catalytic destruction of the ozone layer [5].

Sources

1. [1] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 6: Environmental Degradation and Management > Antarctic Ozone Hole > p. 13
2. [2] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 11: World Climate and Climate Change > Greenhouse Gases(GHGs) > p. 96
3. [5] https://www.bas.ac.uk/data/our-data/publication/the-ozone-layer/
4. [7] https://www.noaa.gov/news-release/noaa-nasa-2025-ozone-hole-is-5th-smallest-since-1992
5. [3] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 6: Environmental Degradation and Management > Some Basic Facts about Ozone Depletion > p. 15