Are HEPA air purifiers worth running in a nursery all night?
Based on 1 peer-reviewed studybaby
Verdict: Safer
Yes. A 2025 trial showed HEPA purifiers measurably lowered blood pressure from indoor pollution.
What's actually in it
HEPA filters capture 99.97% of particles down to 0.3 micrometers, including PM2.5, mold spores, pet dander, and many allergens. A nursery-sized unit runs quietly overnight.
What the research says
A 2025 trial in J Am Coll Cardiol showed HEPA filtration measurably lowered blood pressure and cut indoor PM2.5. Kids in homes with PM2.5 exposure see asthma improvement too.
Skip ozone generators and ionizers, which add pollution. Pick a true HEPA unit sized for the room. Run continuously on low overnight.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Effect of HEPA Filtration Air Purifiers on Blood Pressure. | J Am Coll Cardiol | 2025 |
What to use instead
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