Buying a purifier means decoding a few acronyms. Here is a short glossary, then what the research says.
The glossary
- HEPA: the EPA calls HEPA filters a common way for portable air cleaners to reach high particle removal rates.
- CADR: clean air delivery rate, an estimate of how many particles a unit removes, usually at its top fan speed.
- Activated carbon: removes gases and some odors, works best in bulk, and has no widely used rating.
- Ozone: a lung irritant the EPA says to avoid in units that make it deliberately.
Sizing a unit
The EPA sizing chart, based on 8-foot ceilings, lists about 65 cfm for 100 square feet and about 390 cfm for 600. Measure your bedroom first.
For smoke, look for a high tobacco-smoke CADR.
What a trial found
A six-week, placebo-controlled trial in adults with dust mite allergy found active HEPA purifiers cut bedroom PM2.5 by up to 51.8%. Medication use dropped, but symptom scores did not beat the sham units.
Placement and upkeep
- One unit: put it where you spend the most time, in an open area (WebMD).
- Filter: clean or replace every 6 to 12 months.
- Avoid: ozone makers, ionizers and electrostatic precipitators.
- Prefer: HEPA, which WebMD says lowers indoor fine particles.
Allergies are the likely link to snoring. Healthline lists treating allergies to cut congestion among its tips.
What it will not do
We found no trial showing that purifiers reduce snoring. The EPA says source removal and ventilation come first, with filtration as a supplement.
If you snore every night, work through five questions about snoring devices, and see a doctor about gasping or heavy daytime sleepiness.