Montreal Protocol has helped slow ozone depletion

Montreal Protocol has helped slow ozone depletion
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Highlights

Thanks to the Montreal Protocol, the ozone layer is in much better shape now than it would have been without the United Nations (UN) treaty, a new study says. Without the Montreal Protocol, a very large ozone hole over the Arctic would have occurred during that cold winter and smaller Arctic ozone holes would have become a regular occurrence.

London: Thanks to the Montreal Protocol, the ozone layer is in much better shape now than it would have been without the United Nations (UN) treaty, a new study says. Without the Montreal Protocol, a very large ozone hole over the Arctic would have occurred during that cold winter and smaller Arctic ozone holes would have become a regular occurrence.


The Montreal Protocol came into force in 1987 and it restricted the use of ozone-depleting substances. But the atmospheric concentrations of these harmful substances continued to rise as they can survive in the atmosphere for many years. For the study, researchers used a state-of-the-art 3D computer model of atmospheric chemistry to investigate what would have happened to the ozone layer if the Montreal Protocol had not been implemented.


The hole in the ozone layer over the Antarctic would have grown in size by an additional 40 per cent by 2013. Had ozone-depleting substances continued to increase, the ozone layer would have become significantly thinner over other parts of the globe.

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