You think the ozone healed itself?
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Ozone is added in the upper atmosphere by UV radiation slowly until an equilibrium is reached. In the presence of trace gases like chlorine ozone is depleted. Banning CFCs reduced the amount of trace chlorine so that the ozone layer could regenerate. https://en.wikipedia.org/wiki/Ozone_layer#/media/File:Ozone_cycle.svg …
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