Ozone hole: One of the longest-lived on record is about to close

Ozone layer on 19/11 2021

The ozone layer in late November 2021

Copernicus Atmosphere Monitoring Service, ECMWF

One of the longest 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 the CFC gases 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 how much its length can vary annually depending on polar conditions.

The hole …