High ozone values, shown in this figure with yellow and red colors are not present in the 1993 data indicating a reduction of ozone thought to be caused by the Mount Pinatubo eruption in 1991. These high values are again visible in the 1994 data.
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Ozone is being depleted worldwideΓÇôpartly due to the manufactured chemicals called CFCs, or chlorofluorocarbons, used in refrigeration and other applications. CFCs break down under ultraviolet light and release chlorine atoms that attack ozone.
These images were obtained by NASAΓÇÖs TOMS instrument. They depict and compare the total amount of ozone in a column of atmosphere from the ground to the top of the ozone layer. Total column ozone is measured in Dobson Units.
