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Air pollution could worsen Alzheimer’s and dementia symptoms, according to a new study.

Researchers at the Perelman School of Medicine at the University of Pennsylvania have found that air pollution may accelerate the buildup of toxic proteins in the brain, which can speed up cognitive decline.

The study, published in JAMA Neurology, investigated how fine particle matter (PM2.5) was linked to brain changes seen in dementia and Alzheimer’s and the severity of symptoms.

ALZHEIMER'S RISK COULD RISE WITH SPECIFIC SLEEP PATTERN, EXPERTS WARN

The brains of 602 people were examined after death at the Penn Medicine Brain Bank from 1999 to 2022. This data was analyzed from January to June 2025.

The participants included those

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