As an Amazon Associate I earn from qualifying purchases. Links to Amazon on this page are affiliate links.
The best air purifier for wildfire smoke is one that is big enough
Updated
For wildfire smoke, shop by smoke CADR and buy one size bigger than your room needs. The Levoit Vital 200S-P has a verified smoke CADR of 250 CFM, which fits a room of about 385 sq ft. For a small bedroom, the Levoit Core 300 at 143 CFM fits about 220 sq ft.
Why smoke is the hard case
Smoke particles are the smallest of the three things CADR is measured on (smoke, dust and pollen). That is why the smoke score is the one to use. Smoke also keeps leaking in through gaps around doors and windows for days. A purifier that passes the room's air through the filter once an hour cannot keep up with that.
The rule on this site is room size equals smoke CADR times 1.55. That gives about 4.8 air changes per hour with 8 ft ceilings.
| Model | Smoke CADR on the listing | Real room size | Smoke season tip |
|---|---|---|---|
| Levoit Vital 200S-P | 250 CFM, AHAM Verifide | About 385 sq ft | Best fit for a living room or a bedroom up to about 300 sq ft with headroom |
| Levoit Core 300 | 143 CFM, AHAM Verifide | About 220 sq ft | Use it in a bedroom of 150 sq ft or so, door closed |
| Coway Airmega AP-1512HH | Not shown on the listing we read | About 360 sq ft from the 1 hour claim | Auto mode ramps the fan when its sensor sees particles |
The picks
- Levoit Vital 200S-P. It has the highest verified smoke number on this site, and the score is checked by AHAM, not just claimed. The caveat: it is bigger and louder on high than the bedroom units, and the app needs 2.4 GHz WiFi.
- Levoit Core 300. A verified 143 CFM in a small, quiet body. Owners mention it helping with smoke. The caveat: it is a one-room unit, and the base model has no air quality sensor, so you have to turn it up yourself on smoky days.
- Coway Airmega AP-1512HH. Its particle sensor and auto mode suit smoke that comes and goes. The caveat: the listing we read gives a 1 hour coverage claim and no smoke CADR, so its 360 sq ft figure comes from our divide by 4.8 math.
How to run it on smoke days
- Close windows and doors. A purifier cannot clean the outdoors.
- Pick one room, usually the bedroom, and make that the clean room. One right-sized purifier in one closed room beats one small purifier trying to cover a whole home.
- Run it on high while the smoke is bad. Rated CADR is measured on the top speed. The quiet setting delivers only a fraction of it.
- Keep it running all day and night until the air outside clears.
- Check the filter sooner than usual. Heavy smoke shortens filter life, so have a spare on hand before the season starts.
What a purifier does not do
A HEPA filter catches particles. The smoke smell is partly gases, which only a carbon filter reduces, and thin carbon filters fill up fast. Expect cleaner air, not air with no smell at all.
Check any other model with the room size calculator, or see all five picks on the best by room size page.
Follow your local air quality alerts and any evacuation or shelter guidance.
An air purifier reduces airborne particles. It is not a medical device, and nothing here is medical advice. If anyone in your home has asthma, allergies or another condition, follow your doctor's guidance.