Wildfire Smoke Exposure Linked to COPD Mortality in the US

Strategic Insights -

Research published in Environment International has highlighted the significance of wildfire smoke exposure on chronic obstructive pulmonary disease (COPD) mortality in the elderly population. Investigators from Emory University analyzed data from Medicare and the National Death Index to investigate the relationship between long-term exposure to smoke PM2.5 and COPD mortality among individuals aged 65-100 years in the contiguous United States. The study, which covered the period from 2008 to 2016, revealed that an increase of 1 μg/m3 in smoke PM2.5 was associated with a 9.2% increase in COPD mortality. Notably, the study found that long-term exposure to smoke PM2.5 significantly contributes to COPD mortality, with those living in regions with relatively lower wildfire risk appearing vulnerable.

Key Takeaways:

  • Long-term exposure to smoke PM2.5 is strongly associated with COPD mortality among elderly people in the US.
  • An increase of 1 μg/m3 in smoke PM2.5 is associated with a 9.2% increase in COPD mortality (95% CI: 8.8-9.7%).
  • The study found significant spatial variability in smoke exposure and COPD mortality, with higher risks observed in low-risk wildfire areas.
  • The researchers suggest that wildfire prevention should be emphasized in areas not typically wildfire active to mitigate the impact of smoke PM2.5 on COPD mortality.
  • The study highlights the need for further research on the effects of long-term wildfire smoke exposure on public health.

Statistics:

  • 9.2% increase in COPD mortality associated with an increase of 1 μg/m3 in smoke PM2.5 (95% CI: 8.8-9.7%).
  • 40.4%, 9.6%, and 3.9% increase in deaths in low, moderate, and high wildfire risk areas, respectively, associated with a 1 μg/m3 increase in smoke PM2.5.

Sources:

  • Long-term Exposure To Smoke Pm2.5 and Copd Caused Mortality for Elderly People In the Contiguous United States. Environment International, 2025;199.
  • NewsRx. Studies from Emory University Update Current Data on Environment (Long-term Exposure To Smoke Pm2.5 and Copd Caused Mortality for Elderly People In the Contiguous United States). Ecology, Environment & Conservation. June 13, 2025; p 1841.