A new study has found that air pollution, especially from car emissions, may raise the risk of dementia, including Alzheimer’s disease. Published in The Lancet Planetary Health, the research suggests that small particles in the air, such as PM2.5 and soot, may harm brain health over time.
Pollution and Brain Damage
The study explains that air pollution can lead to inflammation in the brain and oxidative stress. These two harmful processes may damage brain cells and contribute to the development of dementia. Researchers found that for every 10 micrograms per cubic metre of PM2.5 in the air, the risk of dementia rises by 17%. Soot, which comes from vehicles and burning wood, also increases the risk.
Dr. Christiaan Bredell from the University of Cambridge said this shows that dementia prevention needs a broader approach. It’s not just the job of health professionals, but also city planners and government policy-makers.
A Global Health Concern
Currently, over 57 million people are living with dementia around the world. That number is expected to almost triple to 152 million by 2050. Most of the data in this study came from high-income countries across North America, Europe, Asia, and Australia. In total, researchers looked at 51 studies covering more than 29 million people.
The link between air pollution and dementia was strongest for vascular dementia, a type caused by reduced blood flow to the brain.
Time for Action
Dr. Haneen Khreis from the MRC Epidemiology Unit said reducing air pollution could bring many benefits—not just for brain health but also for society, the economy, and the environment. Less air pollution could ease pressure on families and healthcare systems already struggling to care for dementia patients.
In short, cleaner air could mean healthier brains. The study strongly supports taking action through better urban planning, transportation changes, and stronger environmental rules. Addressing pollution might not just help the planet—it might also protect our minds.
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