There is widespread scientific and public interest and concern about losses of stratospheric ozone. Ground based and satellite instruments have measured decreases in the amount of stratospheric ozone in our atmosphere. Over some parts of Antarctica, up to 60% of the total overhead amount of ozone (known as the "column ozone") is depleted during September and October. This phenomenon has come to be known as the Antarctic Ozone hole." Smaller, but still significant, stratospheric decreases have been seen at other, more populated regions of the Earth. Increases in surface UV-B radiation have been observed in association with decreases stratospheric ozone.
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