Global regulation of chlorine compounds is giving the atmosphere time to heal, even as volcanic eruptions interfere
By Alexandra Witze, Nature magazine on July 1, 2016
It's the beginning of the end for the Antarctic ozone hole. A new analysis shows that, on average, the hole — which forms every Southern Hemisphere spring, letting in dangerous ultraviolet light — is smaller and appears later in the year than it did in 2000.
The 1987 global treaty called the Montreal Protocol sought to reduce the ozone hole by banning chlorofluorocarbons, chlorine-containing chemicals — used as refrigerants in products such as air conditioners — that accelerated ozone loss in the stratosphere. The study shows that it worked.