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Wildfire Smoke Linked to increased Stroke Risk, Study Finds
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A new study published in the European Heart Journal reveals a significant link between exposure to wildfire smoke and an increased risk of stroke, estimating that approximately 17,000 strokes in the US each year might potentially be attributable to this environmental hazard.
The growing frequency and intensity of wildfires are not only immediate threats to life and property but also pose a substantial long-term risk to cardiovascular health, according to researchers. This emerging understanding challenges previous assumptions about air pollution and its impact on stroke incidence.
The Rising Threat of Wildfire Smoke
Led by Professor Yang Liu from Emory University’s Rollins School of Public Health, the research highlights how wildfire smoke is reversing decades of progress in air quality, especially in the Western US. “Wildfires are becoming a major contributor to ambient air pollution,” Professor Liu stated. “Stroke is a major cause of disability and death around the world, and it is becoming more common. Customary risk factors such as hypertension and diabetes do not fully explain this trend. We are interested in understanding how long-term exposure to wildfire smoke affects the risk of having a stroke.”
Study Details and Key Findings
The thorough study analyzed data from approximately 25 million people over the age of 65 in the US, utilizing the federal health insurance program Medicare’s records between 2007 and 2018. Around 2.9 million participants experienced a stroke during this period.
Researchers found a statistically significant association between increased levels of fine particulate matter (PM2.5) from wildfire smoke and a higher incidence of stroke.Specifically,for every 10 micrograms per cubic meter increase in PM2.5 exposure, the risk of stroke increased by 8%. The study controlled for various confounding factors, including age, sex, race, socioeconomic status, and pre-existing health conditions.
The study also points to the biological mechanisms by which wildfire smoke contributes to stroke risk. Compounds within the smoke trigger inflammation and oxidative stress in the body, damaging blood vessels and promoting blood clot formation – both known contributors to stroke.Additionally, the stress associated with wildfire evacuations and disruptions to medical care may exacerbate the risk.
Public Health Implications and Preventative Measures
The findings underscore the importance of proactive measures to mitigate the health risks associated with wildfire smoke. “For people living in fire-prone areas, it is indeed critically important to understand that wildfire smoke is not only an immediate breathing hazard, it may also raise long-term stroke risk,” Professor Liu emphasized.
Preventative behaviors, such as utilizing indoor air filtration systems and limiting outdoor exertion during periods of heavy smoke, are crucial. The research also suggests that even moderate, recurring smoke exposure can be detrimental, not just extreme events. Policy interventions focused on fire prevention and management,improved clean air shelters,and ensuring access to healthcare during and after smoke events are essential to reduce stroke burden in aging populations.
Expert Commentary and Future Research
an accompanying editorial in the European Heart Journal, authored by Dr.Kai Chen from the Yale School of Public Health and a colleague, reinforces the growing recognition of wildfire smoke as a significant public health concern. “Wildfire smoke has become an increasingly important source of PM. as climate change drives more frequent and intense wildfires in recent years,” Dr. Chen noted.
The editorial highlights the unique characteristics of wildfire smoke – its episodic nature, high concentration, and distinct composition – which may lead to different cardiovascular effects compared to chronic urban air pollution. further research is needed to fully understand the long-term health impacts of prolonged and repeated smoke exposures. The study by Hao and colleagues, Dr. Chen concluded, adds to a growing body of evidence indicating that wildfire smoke PM. should be recognized as a long-term health risk factor, not merely an acute environmental hazard.
Publication details: Long-term exposure to wildfire smoke particulate matter and incident stroke: a US nationwide study, European Heart Journal (2026). DOI: 10.1093/eurheartj/ehaf875.
Journal details: European Heart journal.
Provided by: European Society of Cardiology.
Citation: Smoke from wildfires linked to 17,000 strokes in the US alone (2026, January 26) retrieved 26 January 2026 from https://
