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Canadian wildfire smoke worsened U.S. air quality, with experts citing climate change as the root cause.
Wildfire smoke from Canada has severely degraded air quality across parts of the U.S. Midwest, prompting political backlash and calls for an EPA investigation, but experts say the real issue is climate change, which is fueling longer, more intense fire seasons across North America.
While Canada’s 2025 fire season is on track to be its second worst, with millions of hectares burned, scientists emphasize that global warming—not national policies—is the primary driver behind rising fire activity and transboundary smoke.
A Nature study found the 2023 fires caused tens of thousands of premature deaths worldwide, including thousands in the U.S. and Europe, due to harmful PM2.5 pollution.
Experts urge cooperation over blame, stressing that long-term solutions require international climate action, improved fire prevention, and stronger public health measures to address shared risks.
El humo de los incendios forestales canadienses empeoró la calidad del aire en Estados Unidos, y los expertos citan el cambio climático como la causa principal.