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It originated, and continues to be widely used, as a measure of total-column ozone, which is dominated by ozone in the stratospheric ozone layer.
en.wikipedia.org During winter, the ozone layer actually increases in depth.
en.wikipedia.org Many solid rockets have chlorine in the form of perchlorate or other chemicals, and this can cause temporary local holes in the ozone layer.
en.wikipedia.org Damage to the ozone layer also means this sunlight is heavy with ultraviolet radiation, with cataracts and cancer becoming more common.
en.wikipedia.org Since little water vapor rises above the troposphere and the ozone layer is in the upper stratosphere, little water is dissociated into hydrogen and oxygen.
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