Air pollution
Fine-particle pollution is linked to higher dementia risk, including at levels common in US cities.
One analysis that pools the results of many studies, so no single odd result can carry the conclusion.
Why it matters
Pollution particles enter the brain through the nose and blood, causing inflammation. HEPA filters and avoiding outdoor exercise on high-pollution days reduce exposure.
What to ask at the checkup
Ask whether air quality is a concern and what steps might reduce exposure
Screening: Local air quality index review
Sources
Ambient air pollution and clinical dementia: systematic review and meta-analysis
Wilker EH, Osman M, Weisskopf MG. BMJ, 2023.
Dirtier air was linked to more dementia, including at levels common in US cities.
Dementia prevention, intervention, and care: 2024 report of the Lancet standing Commission
Livingston G, Huntley J, Liu KY et al.. The Lancet, 2024.
Fourteen things people can change account for nearly half of dementia cases at the population level.
Routines for this factor
Run the air purifier today
Turn on the HEPA air purifier in the room where most time is spent.
2 min, difficulty 1/3
Exercise indoors on high-pollution days
Check the air quality index and move exercise indoors if it is above 100.
10 min, difficulty 1/3
This is research information, not medical advice. Nothing here replaces your parent's doctor.