Breathing polluted air may increase your risk of a common brain tumor, new research shows. A study in the journal Neurology found that people exposed to high levels of traffic-related air pollution were more likely to develop meningioma, a usually noncancerous tumor that grows in the lining of the brain and spinal cord.

Researchers tracked nearly 4 million adults in Denmark for 21 years. Those living in the most polluted areas had up to a 21% higher risk of developing meningioma compared to those in cleaner areas. The biggest risks came from fine particles, ultrafine particles, and nitrogen dioxide, which are common in traffic-heavy urban environments.

Experts say ultrafine particles can cross into the brain and damage tissue over time. “Air pollution doesn’t just harm your heart and lungs — it may hurt your brain, too,” said lead researcher Ulla Hvidtfeldt. She added that reducing air pollution could help protect brain health for millions of people.

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Medical Xpress, July 9, 2025