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Severe wildfires in Canada burned millions of hectares of forest in 2023. The smoke from these fires affected air quality across North America but also traveled across the North Atlantic to Europe and Asia. Despite previous studies on exposure to particulate matter 2.5 μm in diameter or less (PM2.5) from wildfires, the impacts of such extreme events on global air quality and health remain underexplored.
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This text on an editorially selected paper was initially drafted using artificial intelligence, then revised and fact-checked by an editor to meet Nature Portfolio publication standards.
