The ozone hole over Antarctica has shrunk to its fifth-smallest size since records began in 1992, according to a report released on November 24, 2025, by NASA and the National Oceanic and Atmospheric Administration (NOAA).
Scientists say the reduction is a positive sign that the ozone layer is slowly recovering after decades of global action to curb harmful chemicals.
The ozone layer acts as Earth’s natural sunscreen, shielding life from the sun’s harmful ultraviolet (UV) radiation.
When it thins, UV exposure increases, raising risks of skin cancer, eye damage, and crop loss.
The 2025 measurements indicate that the planet’s protective shield is healing.
Satellite data show that during its peak season from September 7 to October 13, the ozone hole averaged 7.23 million square miles (18.71 million km²), roughly twice the size of the continental United States.
Its largest single-day extent was 8.83 million square miles (22.86 million km²) on September 9, about 30% smaller than the record-largest hole in 2006.
The hole also began breaking up almost three weeks earlier than usual, reflecting a trend toward faster recovery.
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Scientists largely credit the improvement to the Montreal Protocol, the 1987 treaty that successfully phased out many ozone-depleting chemicals, including chlorine and bromine.
Paul Newman, lead ozone researcher at NASA, said:
“The ozone hole is forming later and breaking up earlier than in previous decades. This demonstrates that global reductions in harmful chemicals are having a measurable impact, though full recovery will take decades.”
Experts project the Antarctic ozone layer could fully recover by the late 2060s, making the shrinking 2025 hole a rare piece of environmental good news and a reminder that coordinated international action can yield real results.