Air Pollution and Alzheimer’s Risk: New U.S. Study
Long-term exposure to air pollution may increase Alzheimer’s risk in older adults. A large U.S. study shows that fine particle pollution, or PM2.5, is strongly linked to dementia. The researchers accounted for other health conditions but still found a direct connection. Air pollution may not only harm lungs and heart; it can affect brain health too.
Link Between Pollution and Alzheimer’s
Alzheimer’s is the most common form of dementia, affecting around 57 million people worldwide. Studies show that air pollution contributes to Alzheimer’s and other chronic conditions such as stroke, hypertension, and depression. Researchers suggest pollution may damage the brain directly. It can also worsen existing conditions that increase dementia risk. People with prior health problems may be especially vulnerable. Fine particles from traffic and industry can penetrate deep into the lungs and bloodstream, reaching the brain.
Insights from 27 Million Americans
The study analyzed data from over 27 million Medicare beneficiaries aged 65 and older between 2000 and 2018. Researchers compared air pollution exposure to new Alzheimer’s cases. They found higher pollution levels increased the likelihood of developing the disease. Stroke patients faced even higher risk, but hypertension and depression did not significantly change the pollution effect.
Cleaner Air Could Protect Brains
The results suggest pollution affects the brain directly, rather than through other chronic diseases. Individuals with a history of stroke may face compounded risks. Cleaner air policies could help lower dementia rates and protect cognitive health. Experts stress the importance of environmental action to support brain health as populations age.
