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Public Health.

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Summary
This summary is machine-generated.

Ultrafine particulate matter (PM0.1) from wildfires is linked to cognitive decline in non-Latino white older adults. Further research is needed on wildfire impacts on cognition.

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Area of Science:

  • Environmental Health
  • Neuroscience
  • Epidemiology

Background:

  • Fine particulate matter (PM2.5) is linked to cardiovascular disease and dementia.
  • The impact of ultrafine particulate matter (PM0.1) on cognition is underexplored, especially in diverse populations.
  • PM0.1's smaller size allows for greater absorption into the bloodstream.

Purpose of the Study:

  • To investigate the association between long-term exposure to PM0.1 and cognitive function in older adults.
  • To examine effect modification by race and ethnicity in the PM0.1-cognition relationship.
  • To assess the impact of PM0.1 from specific sources, including wildland urban interface (WUI).

Main Methods:

  • Utilized data from 1648 adults (≥65) in the KHANDLE study and 746 African Americans in the STAR study.
  • Assessed cognitive outcomes (semantic memory, verbal episodic memory, executive function) using the Spanish and English Neuropsychological Assessment Scales.
  • Generated PM0.1 exposure data using a chemical transport model and employed linear regression, adjusting for covariates and assessing effect modification by race/ethnicity.

Main Results:

  • No overall associations were found in main effects models.
  • Significant effect modification by race/ethnicity was observed for 5-year WUI PM0.1 exposures across all cognitive domains.
  • Among non-Latino white participants, increased WUI PM0.1 exposure was associated with decreased cognitive function; associations were attenuated for longer exposure durations.

Conclusions:

  • Long-term exposure to WUI PM0.1 is associated with reduced cognitive function in non-Latino white older adults.
  • Wildfires pose an increasing threat, necessitating further research into their cognitive impacts.
  • Findings highlight the need to consider specific PM0.1 sources and racial/ethnic differences in exposure-health relationships.