One of the longest-lived ozone holes on record is about to close

Environment 21 December 2021

By Adam Vaughan

Ozone layer on 19/11 2021

A representation of the ozone layer in late November 2021

Copernicus Atmosphere Monitoring Service, ECMWF

One of the longest-lived ozone holes on record is expected to close this Wednesday after several weeks of exposing wildlife and people in Antarctica to very high levels of ultraviolet radiation. 

The Montreal Protocol’s ban on gases, including CFCs, causing the destruction of the ozone layer have put the hole on track to heal by around the middle of the century. But the swing this year is a reminder of how much the ozone layer can vary annually depending …

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