Using a HEPA air purifier at home for just one month may improve brain function in adults over 40, new research finds — with gains similar to those seen from increased exercise.

The small study looked at adults in a neighborhood with a high level of air pollution from nearby highways.
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https://theconversation.com/hepa-air-purifiers-may-boost-brain-power-in-adults-over-40-new-research-280885