This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Heat waves and wildfires combined with human-caused emissions this year to expose one-third of the world's population to extremely high levels of ozone pollution, a European Union report said Wednesday. In a new analysis covering the first eight months of 2026, the European Union's Copernicus Atmosphere Monitoring Service (CAMS) highlighted the close relationship between climate change and air pollution.
When heat and sunlight react with airborne emissions from wildfires, vehicles and industry, they create ground-level ozone pollution, which can damage lung tissue, cause breathing problems, trigger asthma attacks and lead to other health issues. Despite progress in cutting the most harmful air pollutants in recent decades, ozone has proved more difficult to tackle as climate change fuels the conditions that favor its formation. This year's ozone pollution was driven in part by record-breaking heat waves and wildfires that seared Europe and North America and sent smoke well beyond their borders.
Indonesia has experienced major wildfires, while the warming El Niño weather pattern, which started in June and is due to peak later this year, could drive more fires in Southeast Asia, according to the analysis. "Air pollution does not stop at borders. It can travel thousands of kilometers, crossing continents and oceans and affecting air quality far from its source," CAMS director Laurence Rouil said in the Atmosphere Watch report.
CAMS uses satellite data and computer models to track air pollution and wildfires. The report found that 34% of the global population was exposed to "extremely poor" air quality between Jan. 1 and Sept. 15, meaning concentrations of ozone were well above the World Health Organization's exposure guidance. The WHO's guideline sets 100 micrograms of ozone per cubic meter as the maximum recommended level of exposure, averaged over eight hours.
Another 17% of the world breathed "very poor" air, while 5% was exposed to "good" levels of ozone. Asia has the highest rate of exposure to ozone pollution, with 53% of its population breathing "extremely poor" air. Another 22% was exposed to "very poor" ozone levels.
The continent's widespread emissions are driven by industrialization, economic development and transportation, as well as wildfires and the burning of agricultural residue. New Delhi, Dhaka, the Chinese megalopolis Chongqing and Pakistan's Lahore were among cities whose ozone levels were "extremely poor." Two-thirds of the population in North America and 45% in Europe were exposed to "poor" or "very poor" air quality. EU regulation has been effective in reducing emissions of air pollutants, except for ozone, the report said.
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