One-Month Home HEPA Use May Sharpen Focus in Adults Over 40
A randomized crossover study in Somerville, MA found that using a home HEPA purifier for one month modestly improved cognitive performance—specifically mental flexibility and executive function—by about 12% in adults aged 40 and older, compared with a sham purifier, suggesting reduced particulate exposure from traffic could benefit brain health; the study notes limitations (short duration, unclear mechanism) and calls for longer research to confirm effects and explore aging-related benefits.
