Antarctic Ozone Layer Shows Signs of Recovery
Friday, September 25, 2026198 words3 minutes276 reads
Susan Solomon used her 2026 Tang Prize lecture in Taipei to call Antarctic ozone recovery a rare global environmental success. The result did not come from one discovery alone. It came from observations, chemical research, a treaty, and changes in industry.
Scientists warned in 1974 that CFCs could reach the stratosphere, where ultraviolet radiation would release chlorine. In 1985, British researchers reported a dramatic Antarctic ozone decline. Solomon later showed that very cold polar stratospheric clouds provide surfaces for reactions that activate chlorine. When spring sunlight returns, those reactions accelerate ozone destruction.
Evidence from several research groups helped prompt the Montreal Protocol in 1987. It progressively controlled ozone-depleting substances and gave financial assistance to developing countries adopting alternatives. Solomon said the agreement had been signed by 197 United Nations member states. Atmospheric CFC concentrations have fallen, and the ozone hole now forms more slowly than it did when chlorine levels peaked.
This progress has limits. CFCs have long atmospheric lifetimes, so full recovery will take decades. Solomon also warned that severe wildfire smoke and leakage from CFC chemical feedstocks may slow the process. The story shows that international cooperation can work, but monitoring and practical solutions still matter.
