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Harmful Ozone May Have Reached Two-Thirds of EU Residents During Record June Heat Wave

Nearly 298 million people across Europe were exposed to ozone above EU limits during the late-June heatwave, Global Witness said.

  • A new report from Global Witness found nearly 300 million people, including 100 million children and elderly people, faced toxic ozone levels during Europe's heatwave in late June.
  • At ground level, ozone is created by chemical reactions triggered by high temperatures and strong sunlight, explained Laurence Rouil of the Copernicus Atmosphere Monitoring Service.
  • Nearly 298 million people faced levels above the European Union's recommended daily average of 120 micrograms, while 72 million endured the "most dangerous threshold" of 150 micrograms.
  • James Weber of the University of Reading warned that climate change drives longer, hotter heatwaves, recommending people avoid outdoor exercise when ozone pollution is high.
  • Senior campaigner Flossie Boyd of Global Witness called for immediate action to stop initial emissions, describing the situation as an "invisible threat" linked to fossil fuel dependence.
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17 Articles

Lean Left

According to a report, some 300 million people in the EU were exposed to harmful ozone gases during the heat wave in June, with the highest levels recorded in one place in Germany.

·Germany
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Lean Right

Global Witness report reveals that Portugal is among the affected countries. In Alverca, levels reached 205 μg/m3 — almost twice the WHO limit.

·Lisboa, Portugal
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rtl.lu broke the news in Luxembourg City, Luxembourg on Thursday, July 9, 2026.
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