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Study shows particle pollution from wildfire smoke was tied to 24,100 deaths per year in the US

Chronic exposure to wildfire smoke PM2.5 causes 24,100 deaths annually in the lower 48 U.S. states, with 5,594 more deaths per 0.1 µg/m3 increase, researchers found.

  • Published Wednesday in Science Advances, the paper found that long-term wildfire PM2.5 exposure caused about 24,100 deaths yearly across the lower 48 states from 2006–2020, a figure Min Zhang called 'That's a big number.'
  • Researchers say rising wildfire frequency and intensity from climate change and decades of forest mismanagement expanding the urban–wildland interface are driving wildfire PM2.5 exposure, which the EPA currently does not regulate.
  • Using satellite imagery and federal mortality data, the research team linked smoke exposure across 3,068 counties and found every 0.1 microgram per cubic meter rise in PM2.5 caused about 5,594 additional deaths annually.
  • Deaths rose most for neurological diseases, and Wei emphasized brain vulnerability with the finding that effects were stronger in cooler periods and rural and younger communities, with neurological disorders more affected.
  • Authors called for urgent mitigation and Environmental Protection Agency action, warning that county-level analysis likely underestimates impacts and that no safe threshold exists for chronic wildfire smoke exposure.
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The forest fires are becoming larger, lasting longer and happening more frequently than the climate is — but the damage caused by toxic smoke, especially by prolonged exposure, is still not understood. A study published in this Thursday in Science Advances magazine estimates that the use of forest fires caused about 24,100 deaths per year in the United States of America between 2006 and 2020, a number which, according to the authors, highlights …

·Brazil
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With global warming, forest fires are becoming increasingly large, long and frequent. However, the effects of prolonged exposure to smoke on health are still not well known.

·Paris, France
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By Dorany Pineda. Chronic exposure to wildfire pollution has been linked to tens of thousands of deaths annually in the United States, according to a new study. The article, published Wednesday in the journal Science Advances, found that from 2006 to 2020, long-term exposure to tiny particles in wildfire smoke contributed to an average of 24,100 deaths per year in the 48 contiguous states. “Our message is: Wildfire smoke is very dangerous. It is…

·Boston, United States
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Winnipeg Free Press broke the news in Winnipeg, Canada on Wednesday, February 4, 2026.
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