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The hole truth

Arctic Ozone
Ozone loss in the Arctic stratosphere has never been as severe as that in the Antarctic ozone hole, but during the past year, it declined to a level a bit closer to that of its southern counterpart. Wohltmann et al. report that during the northern spring of 2020, Arctic stratospheric ozone levels fell to near zero in some places. This unprecedented depletion, caused by unusually cold and stable conditions in the Arctic stratosphere, could become more frequent or extensive if the recent trend toward colder Arctic winters continues.

Geophys. Res Lett. 10.1029/2020GL089547 (2020).