Chlorine- and bromine-containing ozone-depleting substances (ODSs) are
controlled by the 1987 Montreal Protocol. In consequence, atmospheric
equivalent chlorine peaked in 1993 and has been declining slowly since
then. Consistent with this, models project a gradual increase in
stratospheric ozone with the Antarctic ozone hole expected to disappear
by ~2050. However, we show that by 2013 the Montreal Protocol had
already achieved significant benefits for the ozone layer.
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