![](https://lemmy.dbzer0.com/pictrs/image/7a5f2e37-8b85-445b-a1fc-704c9eff985f.jpeg)
![](https://mander.xyz/pictrs/image/e96d49e8-77d7-42b5-a65a-c8e3e391f6c9.png)
Apparently, a volcano eruption. The last paragraph of this section states:
In September 2023, the Antarctic ozone hole was one of the largest on record, at 26 million square kilometers. The anomalously large ozone loss may have been a result of the Hunga Tonga–Hunga Haʻapai eruption.
It is actually getting better, it just takes time.
In fact, according to the above Wikipedia article it was in a great spot in 2019 and then a volcano erupted: