Antarctic Ozone Hole Expands to Largest Size in a Decade

Scientists from NASA and NOAA emphasize that the 2026 ozone hole ranked as the seventh-largest in 48 years of observations, based on its average seasonal area. Between September 7 and October 13, 2026, when ozone depletion was at its seasonal peak, the hole covered an average of approximately 9.6 million square miles (25 million square kilometers). That is more than twice the size of the United States. The annual ozone hole has been forming later in the season in recent years, which tells us the ozone layer is healing, according to Paul Newman, a senior scientist at the University of Maryland (id:1). [1]

Despite the hole's large size, scientists note that international efforts to reduce harmful chemicals have prevented it from becoming even larger. Newman stated that the 2026 ozone hole could have been 1 to 2 million square miles (3.5 million square kilometers) larger if ozone-depleting substances were as prevalent in the atmosphere today as they were at their year 2000 peak. The polar vortex was unusually large in 2026 in part because planetary-scale weather systems that typically break up the vortex were especially weak in August and September (id:1). [1]

Unusual weather patterns over Antarctica caused the ozone hole to expand dramatically in 2026, reaching one of its largest sizes on record. Scientists from NASA and NOAA attribute the expansion primarily to an exceptionally strong polar vortex, a large circulation of winds that influences atmospheric conditions over Antarctica (Source ID: 1). The polar vortex played a crucial role in extending ozone depletion across a larger area, as atmospheric disturbances that would normally weaken it were unusually subdued (Source ID: 1). [1]

The ozone hole reached its maximum extent on September 18, spreading across 10.5 million square miles (27.1 million square kilometers). This was approximately 90% of the size of the largest ozone hole ever measured, which occurred on September 9, 2000 (Source ID: 1). Despite the hole's large size, scientists note that international efforts to reduce harmful chemicals have prevented it from becoming even larger. Without reductions in chemicals known to destroy ozone, the affected area could have been substantially greater (Source ID: 1). [1]

The 2026 ozone hole ranked as the seventh-largest in 48 years of observations, based on its average seasonal area. Scientists closely monitor ozone in the stratosphere because it serves as Earth's natural "sunscreen," protecting living organisms from dangerous solar radiation (Source ID: 1). The measurements showed that ozone levels directly above the South Pole fell to their lowest reading of 2026 on October 17, reaching 105 Dobson units (Source ID: 1). [1]

Unusual weather patterns over Antarctica caused the ozone hole to expand dramatically in 2026, reaching one of its largest sizes on record. The ozone hole reached its maximum extent on September 18, spreading across 10.5 million square miles (27.1 million square kilometers). This was approximately 90% of the size of the largest ozone hole ever measured, which occurred on September 9, 2000 (Source ID: 1). [1]

Scientists from NASA and NOAA emphasize that the 2026 ozone hole ranked as the seventh-largest in 48 years of observations, based on its average seasonal area. Despite the hole's large size, scientists note that international efforts to reduce harmful chemicals have prevented it from becoming even larger. Between September 7 and October 13, 2026, when ozone depletion was at its seasonal peak, the hole covered an average of approximately 9.6 million square miles (25 million square kilometers) (Source ID: 1). [1]

The expansion of the ozone hole was primarily attributed to an exceptionally strong polar vortex, a large circulation of winds that influences atmospheric conditions over Antarctica. Scientists closely monitor ozone in the stratosphere because it serves as Earth's natural "sunscreen," protecting living organisms from dangerous solar radiation (Source ID: 1). [1]

Sources

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Prepared with AI assistance from the cited sources.