Actually, we see ozone depletion all across the planet all the time. It's the Earth's natural sanitation/purification process. In places of scientific importance there will be more testing and reporting, so naturally you tend to see more of those. read more
The mechanism of formation of the ozone hole over Antarctica: The air contaminated with CFCs, halons and other gases is conveyed over a certain distance. Along with large-scale air currents in the atmosphere mass of polluted air is then dispersed across the globe. read more
The role of sunlight in ozone depletion is the reason why the Antarctic ozone depletion is greatest during spring. During winter, even though PSCs are at their most abundant, there is no light over the pole to drive chemical reactions. read more