Researchers tracked health records from 1.2 million older adults in Southern California between 2009 and 2019.
Wildfire smoke may be worse for brain health than other types of air pollution, according to new research linking it to an increased risk of dementia.
At issue is fine particulate matter or PM2.5 – tiny particles about 30 times smaller than the diameter of a human hair that can be inhaled deep into the lungs and move to the bloodstream. This pollution – from traffic, factories and fires – can cause or worsen heart and lung diseases, and the new study adds to evidence it may play some role in dementia, too.
The study found the odds of a new dementia diagnosis increased about 21% for every 1 microgram increase in the concentration of wildfire particles. That compared with a 3% increased risk for every 3 microgram jump in non-wildfire particles, concluded researchers from the universities of Washington and Pennsylvania.
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