in the stratosphere, the scale of the hole is controlled by the stratospheric temperature.
As it turns out, the identical ozone that protects us from the sun’s UV radiation also protects CFCs in the decrease ranges of the ambiance. The Montreal Protocol, signed in September 1987, arrange an international framework to scale back use of CFCs and different ozone-depleting substances (ODS). The industrialized nations of North America and Europe took the lead in creating a world system to regulate CFC emissions, notably after the shock discovery of the Antarctic “ozone hole” in 1985 (although its reference to CFCs had not been firmly established at that time).
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