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Ozone hole in 2026 is largest in a decade, but long-term recovery remains on track: Report
The hole covered 9.6 million square miles on average, and scientists said long-term recovery remains on track despite the larger size.
NASA and NOAA reported the Antarctic ozone hole reached its largest extent in a decade, becoming the seventh largest in 48 years of monitoring.
Unusually powerful polar vortex conditions allowed the hole to expand; planetary-scale weather systems were weak in August and September, said Amy Butler, a research scientist at the NOAA Chemical Sciences Laboratory.
Satellite data confirmed the hole reached a peak one-day extent of 10.5 million square miles on Sept. 18, marking its greatest size for the year.
Controls established by the Montreal Protocol continue to drive long-term recovery, ensuring the ozone layer remains on track despite this year's seasonal fluctuations.
Senior NASA scientist Paul Newman noted the hole could have been 1 to 2 million square miles larger without ozone-protection efforts, as older compounds continue to disintegrate.