The ozone layer is slowly recovering due to the Montreal Protocol. The only exception is the ozone in the tropical lower stratosphere, which keeps decreasing. Now, a modelling study demonstrates that the tropical ozone loss is partly driven by ozone-depleting very short-lived substances that are not regulated by the Montreal Protocol.
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Son, SW. Stratospheric ozone loss by very short-lived substances. Nat. Clim. Chang. 13, 509–510 (2023). https://doi.org/10.1038/s41558-023-01687-4