NOAA and NASA report the 2026 ozone hole reached 10.5 million square miles due to a powerful polar vortex, though long-term recovery remains on track.
The 2026 Antarctic ozone hole was the seventh largest in 48 years of monitoring, according to a report from NOAA and NASA. The hole reached its maximum extent on September 18, measuring 10.5 million square miles (27.1 million square kilometers), which is approximately 90% as large as the largest ozone hole on record in 2000.
Researchers attributed the size of the hole to an unusually powerful polar vortex. Amy Butler, a research scientist at NOAA's Chemical Sciences Laboratory, stated, "The polar vortex was unusually large this year in part because planetary-scale weather systems that typically well up from the lower atmosphere and break up the vortex were especially weak in August and September." This weak wave action kept the strongest polar vortex winds further from the South Pole by several degrees of latitude, creating conditions ideal for ozone depletion.
While the area was large, scientists noted the hole was not as deep as record-breaking holes from previous decades. On October 17, ozone concentrations directly overhead reached a low of 105 Dobson units. For comparison, the lowest value ever recorded over the South Pole was 92 Dobson units in October 2006.
Despite the size of the 2026 hole, NOAA and NASA scientists emphasized that long-term recovery remains on track. Paul Newman, a senior scientist at the University of Maryland and leader of NASA's ozone research team, noted, "The annual ozone hole has been forming later in the season in recent years, which tells us the ozone layer is healing."
Newman added that the 2026 hole "could have been 1 to 2 million square miles larger if ozone-depleting substances were as prevalent in the atmosphere today as they were at their year 2000 peak."
According to Stephen Montzka, a senior scientist at NOAA’s Global Monitoring Laboratory, chlorine levels in the Antarctic stratosphere derived from ozone-depleting substances have declined by about a third relative to levels reached in the 1980s. Researchers estimate the ozone hole will recover by the 2070s as older compounds like chlorofluorocarbons (CFCs) disintegrate.
The ozone layer acts as a planetary sunscreen, shielding humans, animals, and plants from harmful ultraviolet (UV) radiation. When ozone levels drop, increased UV rays reaching the surface can lead to adverse environmental and health impacts, including skin cancer, cataracts, and crop damage.
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This article was drafted with AI assistance and checked against the sources above. Company claims are reported as claims. Cover image is AI-generated.
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