The short answer
For smoke, the most useful number on an air purifier is its certified smoke CADR, and you can look it up yourself in ENERGY STAR's public database. By that number, the strongest purifiers from Winix, Levoit, Coway, Alen, AirDoctor, and Blueair land within about 25% of each other (roughly 350 to 460 cfm). What separates them is how much room they cover, how much electricity they use, and how loud they are. Independent testers who fill rooms with smoke have also landed on a few repeat favorites, listed below. We haven't tested any of these ourselves yet.
How we built this comparison
Every number in the table comes from ENERGY STAR's list of certified room air cleaners. Those figures come from lab testing under the AHAM AC-1 standard, the same test behind the CADR label on the box. We did not use the room sizes printed on packaging, and we did not use anything a company says without certification.
From those certified numbers we calculated two things:
- Largest room for smoke. EPA and ENERGY STAR guidance says smoke CADR should be at least two-thirds of the room's floor area (8-foot ceilings). That means the biggest room a unit can handle is about 1.5 times its smoke CADR.
- Electricity cost per year. ENERGY STAR's rated annual energy use, multiplied by 17 cents per kWh, which is close to the recent U.S. residential average. Your rate may be higher or lower.
We picked popular models from well-known brands. This isn't every certified purifier, and a model's absence doesn't mean it's bad. Some popular older models, including the Coway Airmega AP-1512HH, aren't in ENERGY STAR's current list. You can check those in AHAM's directory instead.
Certified smoke CADR, side by side
The full table
| Model | Smoke CADR (cfm) | Largest room for smoke | Rated energy use | Electricity per year at 17ยข |
|---|---|---|---|---|
| Winix Tower XQ | 461 | about 690 sq ft | 486 kWh | about $83 |
| Levoit Core 600S (LAP-C601S) | 394 | about 590 sq ft | 389 kWh | about $66 |
| Coway Airmega 400 (AP-2015F) | 376 | about 565 sq ft | 366 kWh | about $62 |
| Alen BreatheSmart 75i | 370 | about 555 sq ft | 304 kWh | about $52 |
| AirDoctor AD4000 | 370 | about 555 sq ft | 396 kWh | about $67 |
| Blueair Blue Pure 211+ | 348 | about 520 sq ft | 350 kWh | about $60 |
| Coway Airmega 300 (AP-1515H) | 315 | about 470 sq ft | 314 kWh | about $53 |
| Winix T810 | 270 | about 405 sq ft | 259 kWh | about $44 |
| Levoit Core 400S | 231 | about 345 sq ft | 237 kWh | about $40 |
| AirDoctor AD1500 | 170 | about 255 sq ft | 166 kWh | about $28 |
A few patterns stand out:
- Close at the top. Five models sit between 348 and 394 cfm. Any of them can handle a large bedroom or a typical living room during smoke.
- Efficiency varies more than power. The Alen 75i and AirDoctor AD4000 have the same smoke CADR. In ENERGY STAR's rating, though, the Alen uses about 23% less electricity per year.
- Ozone was low across the board. Every model here was listed at 5 parts per billion of ozone or less. California's limit for air cleaners is 50 ppb.
- Price isn't in the table on purpose. Prices change weekly. Use our calculator to see the 5-year cost, including filters.
What independent smoke tests found
Certified CADR comes from a standard lab chamber. Independent reviewers test differently: they fill an ordinary room with smoke and time how fast a purifier clears it. Two of them stand out for publishing their methods.
- TechGearLab (updated May 2026) sealed a 200 sq ft room, released smoke, and timed how long each unit took to clear fine and coarse particles. Cleaning performance was 40% of each score and noise was 30%. Their top overall pick was the Blueair Blue Pure 311i Max, their best-value pick was the Levoit Core 300, and their pick for allergies and smoke was the Winix 5510.
- HouseFresh (August 2026) tested the AirDoctor AD3000 by burning incense in a 728-cubic-foot room. At top speed it cleared the finest particles in about 20 minutes, which they said matched the Blueair Blue Pure 211+. It was also the loudest unit they had measured at top speed, about 63.5 dBA from 3 feet.
These are single tests in single rooms, so treat them as a useful cross-check, not a final ranking. Their results do line up with the certified numbers. That matters, because it suggests the CADR label is a fair guide to real-world smoke performance.
Brand by brand
- Winix. Strong certified smoke CADR for the money across several models, and a repeat pick in independent tests (the 5510).
- Levoit. The Core 600S has one of the highest certified smoke CADRs here. Its smaller Core models are common budget picks.
- Coway. Several Airmega models are certified, from the compact Airmega 300 up to the large ProX at 577 cfm. The older AP-1512HH is a long-time reviewer favorite but isn't in the current ENERGY STAR list.
- Alen. The BreatheSmart 75i matches the big models on smoke CADR and was the most efficient of the large units here.
- AirDoctor. The AD4000 and AD1500 are ENERGY STAR certified. Treat marketing claims beyond the certified CADR, such as "100 times better than HEPA," as the company's claim, not an independent result.
- Blueair. The Blue Pure 211+ is certified at 348 cfm, and its newer Blue Pure models lead at least one independent tester's rankings.
- IQAir. IQAir publishes its own test results. We didn't find its HealthPro Plus in ENERGY STAR's certified list, so it can't be compared on the same scale as the models above.
How to choose
- Measure the room and multiply the floor area by two-thirds. That's the smoke CADR you need at minimum, with 8-foot ceilings.
- Then size up. A unit with extra CADR can run on a lower, quieter speed and still keep up. A purifier you turn off because it's loud does nothing.
- Compare running costs, not just the sticker price. Electricity and replacement filters over five years can rival the purchase price.
- Look up the certified number yourself in ENERGY STAR or AHAM before you buy. If you can't find a model in either, its CADR hasn't been independently certified.
What we will test next
When our testing setup is running, we plan to measure how fast top models clear smoke in an ordinary room, how loud they are at each speed, and how much power they actually draw. We'll publish the method and the raw data alongside the results.
Sources
- ENERGY STAR. Certified Room Air Cleaners product finder (accessed November 8, 2026). energystar.gov
- AHAM Verifide. Directory of Certified Room Air Cleaners. ahamverifide.org
- U.S. EPA. Guide to Air Cleaners in the Home (sizing guidance). epa.gov
- TechGearLab. The Best Air Purifiers (updated May 13, 2026). techgearlab.com
- HouseFresh. AirDoctor AD3000 review (August 30, 2026). housefresh.com
- California Air Resources Board. Air cleaning device certification, ozone emission limit. ww2.arb.ca.gov