The World Meteorological Organization (WMO) reports that the Antarctic ozone hole is on a path to recovery, with the most recent hole measuring as the fourth or fifth smallest since 1992. For the second consecutive year, the hole has remained significantly smaller than the 1990 to 2010 average. The ozone layer has been regenerating since 2000, following the implementation of the 1987 Montreal Protocol, which successfully phased out ozone-depleting chemicals such as chlorofluorocarbons.
Despite this progress, the WMO warns that UV radiation levels remain a concern. Since the mid-1990s, UV radiation in parts of Europe has increased by up to 20 percent, a trend attributed largely to reduced cloud cover and increased sunshine. Higher UV exposure is linked to an increased risk of skin cancer and other health conditions. Furthermore, ozone levels remained below average across much of the Northern Hemisphere in 2025, including regions spanning from Greenland and Europe to Central Asia and Japan.
Experts have raised concerns regarding the decline in global monitoring infrastructure. The number of ozone layer monitoring stations has dropped from 130 in the early 2000s to 110 today. While Europe maintains one of the world’s densest networks, including the EuBrewNet system of approximately 50 spectrophotometers, officials emphasize that consistent data collection remains vital.
Laurence Rouil, director of the Copernicus Atmosphere Monitoring Service at the European Centre for Medium-Range Weather Forecasts, noted that the 2026 ozone hole showed an earlier-than-average increase in area during September. She stressed that high-quality datasets are essential for understanding atmospheric changes, noting that no single diagnostic can provide a complete picture of the ozone layer’s status.
The WMO also clarified that the recovery of the ozone layer is distinct from the challenges posed by climate change. While the ozone hole was caused by specific chemical emissions, climate change is driven by the accumulation of greenhouse gases such as carbon dioxide. Consequently, the success in repairing the ozone layer does not directly address the broader issues of global temperature rise and extreme weather.
Article source: euobserver.com | Image credit: euobserver.com