Ozone depletion consists of two related events observed since the late 1970s: a lowered total amount of ozone in Earth's upper atmosphere, and a much larger springtime decrease in stratospheric ozone around Earth's polar regions. From Wikipedia
Last year's Hunga Tonga-Hunga Ha'apai volcano eruption likely contributed to the ozone depletion in 2023, but overall progress in ozone layer recovery and efforts from the Montreal Protocol led to only modest damage instead of feared aggravation.
