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BRUSSELS - Nearly 40 per cent of the world’s population has been exposed to harmful levels of ground-level ozone in 2026, according to a new analysis by the Copernicus Atmosphere Monitoring Service (CAMS).
The analysis, published Wednesday, shows how extreme heat and human-caused air pollution combined to drive ozone pollution across large parts of the world during the first eight months of the year.
According to CAMS, only five per cent of the global population was exposed to ozone levels classified as "good” under the analysis, while Asia was the world’s most affected region, followed by Europe and North America.
Some 60 per cent of Asia's population was exposed to "extremely poor” ozone levels in 2026, rising to 90 per cent when populations exposed to "poor” and "very poor” levels were included.
In Europe, 50 per cent of the population experienced "poor,” "very poor” or "extremely poor” ozone exposure, with repeated heat waves between June and August contributing to elevated ozone concentrations.
In North America, more than two-thirds of the population experienced "poor,” "very poor” or "extremely poor” ozone exposure, with emissions from major wildfires contributing to elevated ozone concentrations.
CAMS said Oceania remained the region with the lowest ozone exposure, with its entire population experiencing "good” or "fair” ozone levels.
In South America, 81 per cent of the population experienced "good” or "fair” ozone exposure, while the figure for Africa was 56 per cent.
The analysis also highlighted the increasing importance of transboundary air pollution, with wildfire smoke, desert dust and other pollutants traveling thousands of kilometres across national borders and oceans.
CAMS said the findings underline the relationship between climate change and air quality.
Ozone itself is a greenhouse gas, while higher temperatures can create conditions that favour ozone formation, creating what scientists describe as an "ozone-climate penalty.”
"Air pollution does not respect national borders. Wildfire smoke, ozone and dust can travel thousands of kilometres, affecting communities far from their source,” Laurence Rouil, director of CAMS, said.
Rouil said the findings highlight the need for global action on air quality alongside climate measures. - BERNAMA
