There is one “ozone hole” over Antarctica, although it is not truly a hole, but a region where the concentration of ozone becomes very low in the lower stratosphere at some points during the year. The ozone layer in the upper stratosphere remains largely unaffected.
The ozone hole occurs during the Antarctic spring, from September to early December. During this time, the total ozone concentration over the Antarctic continent can decline by 50% or more.
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