Experts promise ozone recovery - so why are UV levels spiking in Europe?

Key Points:

• The World Meteorological Organization's 2025 Ozone Bulletin reports that shifting weather patterns have reduced regional cloud cover, resulting in increased annual sunshine and higher ground-level UV radiation despite ongoing stratospheric ozone recovery.
• The ozone layer, a thin 3-millimeter shield compressed to sea-level pressure, absorbs most of the sun’s harmful ultraviolet radiation; its depletion was primarily caused by chlorofluorocarbons (CFCs), which were largely phased out globally under the Montreal Protocol and related agreements.
• Although global ozone levels have been recovering since 2000, regional fluctuations occur naturally, with 2025 seeing below-average ozone in parts of the Northern Hemisphere; however, these dips only minimally affect the long-term trend of rising UV exposure.
• The primary driver of increased UV radiation in Europe over the past 30 years is reduced cloud cover, allowing more solar radiation to reach the surface, highlighting that local weather patterns can override the protective effects of a healing ozone layer.
• The WMO emphasizes that despite ozone recovery, individuals should continue sun protection practices such as using sunscreen, wearing UV-rated sunglasses, and seeking shade, as clearer skies currently increase daily UV exposure risks.