Where was the "Ozone Hole" first noticed?

The identification of the "Ozone Hole" mainly pertains to observations made over Antarctica. In the mid-1980s, scientists discovered a significant depletion of ozone in the stratosphere above this region, especially during the Southern Hemisphere's spring, leading to concerns about increased ultraviolet (UV) radiation reaching the Earth's surface.

The Antarctic ozone depletion is attributed to a combination of factors, including the presence of extremely cold temperatures in the polar stratosphere and the release of chlorofluorocarbons (CFCs) and other ozone-depleting substances into the atmosphere. These conditions create an environment conducive to the destruction of ozone molecules. While ozone depletion can occur in other regions, the phenomenon termed the "Ozone Hole" is specifically associated with Antarctica due to its severe and unique climatic conditions.

Locations such as the Arctic and Canada do not exhibit the same conditions for ozone depletion, and while there can be fluctuations in ozone levels in the Northern Hemisphere, they do not create the significant hole in the ozone layer experienced over Antarctica. Chile, while geographically closer to Antarctica, is not the site where the ozone depletion was first identified; thus, the correct answer reflects the specific location linked historically and scientifically to the discovery of the ozone hole.