Wildfire Smoke Linked to Increased Risk of Dementia, Study Finds

A study has revealed that wildfire smoke may pose a greater threat to brain health compared to other forms of air Pollution, potentially raising the risk of dementia. These findings were presented at the Alzheimer’s Association International Conference in Philadelphia on Monday.

The study comes at a time when millions of Americans are grappling with poor air quality due to massive wildfires in the western United States, including a colossal blaze in California that has now consumed over 360,000 acres.

Central to the research is PM 2.5, a type of fine particulate matter. These particles, which are approximately 30 times smaller than the diameter of a human hair, can penetrate deep into the lungs and enter the bloodstream. PM 2.5 Pollution can originate from traffic, industrial activities, and fires, and is known to exacerbate heart and lung diseases. The new study, however, suggests it may also play a role in the development of dementia.

Researchers from the Universities of Washington and Pennsylvania analyzed the health records of 1.2 million older adults in southern California between 2009 and 2019. They assessed residential exposure to PM 2.5 from wildfire smoke and other sources over three years. The study found that each 1 microgram increase in wildfire-related PM 2.5 concentration was associated with a 21% higher risk of a new dementia diagnosis. In contrast, a 3 microgram increase in non-wildfire PM 2.5 particles correlated with only a 3% increased risk.

While the exact reasons for this disparity remain unclear, Maria Carrillo, chief science officer at the Alzheimer’s Association, emphasized the need for further investigation, especially given the increasing frequency of wildfires. She also noted that lower-income populations, who are at a higher risk for Alzheimer’s, often have less ability to avoid exposure to unhealthy air.

Health advisories often recommend staying indoors when air quality is poor. However, Carrillo pointed out that many people, particularly those with outdoor jobs, cannot easily avoid exposure.

This study adds to the growing evidence of the harmful effects of wildfire smoke on human health. A study published in June linked over 50,000 premature deaths in California over the past decade to wildfire smoke exposure. Other research has connected wildfire smoke to higher risks of heart attacks and premature births.

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Related Content:

• Record-Breaking Wildfires Signal Escalating Climate Crisis
• Global Air Pollution and Wildfires Cause Over 135 Million Premature Deaths
• Study Says 52,000 People Died in the Last 10 Years from California Wildfire Air Pollution
• Environmental Coalition Urges FEMA to Classify Heat Waves and Wildfire Smoke as Major Disasters

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