Air Pollution Linked to Reduced Physical Function in Older Adults

Strategic Insights -

As the global population ages, researchers at the University of Washington have made a crucial discovery that highlights the devastating impact of air pollution on older adults. A longitudinal analysis conducted on a cohort of 5,305 older adults in the Puget Sound region of Washington state has found a significant association between exposure to traffic-related air pollutants (TRAPs) and reduced physical function. The study, published in Environment International, suggests that exposure to these pollutants can lead to systemic inflammation, worsening physical function, and even accelerating aging.

Key Takeaways:

  • The study analyzed data from 5,305 older adults in the Puget Sound region of Washington state, enrolled between 1994-2020.
  • Researchers estimated long-term average air pollution concentrations at residential addresses using spatial prediction models.
  • The study found that higher exposure to BC (black carbon) and NO2 (nitrogen dioxide) was associated with faster declines in physical performance, equivalent to an additional 2.6 months and 1.8 months of aging over 5 years, respectively.
  • The study suggests that air pollution from traffic may impact the physical function of older adults, though more research is needed to confirm these findings.
  • The research team included Annie Doubleday, Magali Blanco, Sara D. Adar, Anjum Hajat, Ge Li, Eric B. Larson, Paul K. Crane, and Lianne Sheppard from the University of Washington's Department of Environmental and Occupational Health Sciences.
  • The study was funded by the National Institute of Environmental Health Sciences and the National Institute on Aging.
  • The findings have significant implications for public health policy, highlighting the need for more research on the relationship between air pollution and physical limitations in older adults.

Statistics:

  • 5,305 participants were included in the longitudinal analysis.
  • 124 ng/m3 higher 5-year average BC exposure was suggested to be associated with faster declines in physical performance, equivalent to an additional 2.6 months (-0.4, 5.6) of aging over 5 years.
  • 2.1 ppb higher 5-year NO2 exposure was suggested to be associated with faster declines in physical performance, equivalent to an additional 1.8 months (-0.7, 4.3) of aging over 5 years.

Sources:

  • Research: Traffic-related air pollutant exposure and physical performance in the Adult Changes in Thought cohort (Environment International, 2025,204():109850)
  • Publisher: Elsevier
  • Journal article: https://doi-org.sdpl.idm.oclc.org/10.1016/j.envint.2025.109850
  • Researchers: Annie Doubleday, Magali Blanco, Sara D. Adar, Anjum Hajat, Ge Li, Eric B. Larson, Paul K. Crane, Lianne Sheppard
  • Funding: National Institute of Environmental Health Sciences, National Institute on Aging