Are ionizer air purifiers safer than HEPA?
Based on 1 peer-reviewed studyhome
Verdict: Avoid
No. Ionizers can produce ozone, which is a lung irritant.
What's actually in it
Ionizer air purifiers charge particles so they fall out of the air. Many models also produce ozone as a byproduct, which irritates lungs and can trigger asthma. HEPA filters don't do this.
What the research says
A 2025 trial in J Am Coll Cardiol showed HEPA air purifiers measurably lowered blood pressure in real homes. Ionizer studies generally don't show similar clean benefits.
Skip ionizers. Use a true HEPA air purifier sized for your room.
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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