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Science · Neuroscience · published 2026-08-30 · via ScienceDaily

Home HEPA purifiers improve cognitive speed in older adults

Image via ScienceDaily
Image via ScienceDaily

In a randomized study of 119 adults aged 30-74 in Somerville, Massachusetts, using a HEPA air purifier for one month led to a 12% faster performance on an executive function test. The improvement was observed in participants aged 40 and older. The findings suggest that reducing indoor particulate matter may benefit brain health.

Expanded Detail

EXPANDED:

The study involved 119 participants aged 30-74 in Somerville, Massachusetts, an area with elevated traffic-related pollution due to nearby highways. Participants used both a real HEPA purifier and a sham version for one month each, with a break between. The cognitive test measured visual memory, motor speed, and executive function through line-drawing tasks.

The 12% improvement in executive function appeared only in those 40 and older, roughly 42% of the sample. This benefit is comparable to gains from increased daily exercise, and even small cognitive declines are linked to higher mortality risk.

CONTEXT

Expanded detail and Context are AI-generated analysis; the linked article remains the authoritative source.
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This summary is Al-enhanced to contain extended analysis and broader social context. The original is {NAME); the linked article is the authoritative source. Original headline: “HEPA air purifiers may boost brain function after just one month.” Browse more stories.