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Story summary
- Using a HEPA air purifier for one month improved brain function in adults aged 40 and older.
- The study, conducted in Somerville, Massachusetts, involved 119 participants exposed to high levels of traffic-related air pollution.
- Participants showed a 12% improvement in mental flexibility and executive function compared with a sham device.
- Researchers say the improvement may be modest but parallels cognitive benefits from increased exercise, and further research is planned.
