Blueair vs LEVOIT
A brand comparison with an unusually clean answer, because the two ranges trade off against each other on exactly one axis and the registers publish it.
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Blueair wins on efficiency and LEVOIT wins on ozone, and both margins are large. The three highest air-per-watt figures we have are Blueair, from 8.2 to 9.0 CFM per watt; LEVOIT’s range runs 5.3 to 6.0. Every Blueair here measures 1 to 5 ppb of ozone and carries an ion stage. Every LEVOIT measures 0.00 with none.
Brand-versus-brand is usually a poor way to buy an appliance. It works here because the two ranges are internally consistent: the thing that is true of one Blueair is true of all of them, and the same goes for LEVOIT. That makes the comparison a real decision rather than a badge preference.
On efficiency, Blueair is not close to being beaten
| Unit | CFM per watt | Smoke CADR | Certified room | Electricity / yr |
|---|---|---|---|---|
| Blueair 211i Max | 9.0 | 435 | 674 sq ft | $47 |
| Blueair 311i Max | 8.4 | 283 | 439 sq ft | $35 |
| Blueair 411i Max | 8.2 | 145 | 225 sq ft | $20 |
| Blueair DustMagnet 5440i | 5.9 | 216 | 335 sq ft | $40 |
| LEVOIT Core 600S | 6.0 | 391 | 606 sq ft | $71 |
| LEVOIT Core 400S | 5.8 | 231 | 358 sq ft | $43 |
Electricity costs on this page use 18.34¢ per kWh, the U.S. average residential price for June 2026 from the U.S. Energy Information Administration, Electric Power Monthly, Table 5.3. Your rate is on your bill and is probably not this one; multiply the kWh figure by your own rate and you have your number.
The headline comparison is the two large machines. The Blue Pure 211i Max certifies 674 square feet on 256 kWh a year. The Core 600S certifies 606 on 387. That is more coverage for a third less electricity, and over a machine’s life it is a meaningful sum rather than a rounding difference.
On ozone, LEVOIT is not close to being beaten
Every Blueair model in our data carries an ion generator by at least one register’s classification, and every one has a non-zero measured ozone emission. Every LEVOIT is classified fan-and-filter by ENERGY STAR and measures 0.00 ppb.
| Unit | AHAM classification | ENERGY STAR | Measured ozone |
|---|---|---|---|
| Blueair 211i Max | Fan Filter with Ion Generator | Fan and Filter | 2 ppb |
| Blueair 311i Max | Fan Filter with Ion Generator | Fan and Filter | 2 ppb |
| Blueair 411i Max | Fan Filter with Ion Generator | Fan and Filter | 2 ppb |
| Blueair DustMagnet 5440i | Fan Filter with Ion Generator | — | 1 ppb |
| LEVOIT Core 400S | Not listed | Fan and Filter | 0.00 ppb |
| LEVOIT Core 600S | Not listed | Fan and Filter | 0.00 ppb |
These are small numbers and they are legal numbers. The reason they decide this page for a particular reader is EPA’s position: avoid portable air cleaners that intentionally produce ozone, because ozone is a lung irritant. If the person the machine is for has asthma, a measured zero is worth more than three CFM per watt.
Quick picks
One from each range, plus the machine that takes both arguments off the table.
| # | Product | Best for | Certified CADR | Price |
|---|---|---|---|---|
| 1 | No photo Best Blueair Blueair Blue Pure 211i Max 9.0 CFM per watt across 674 certified sq ft — the efficiency leader. | Open-plan spaces above 500 sq ft | 435CFM smoke AHAM VERIFIDE | |
| 2 | No photo Best LEVOIT LEVOIT Core 600S 391 certified CFM with 0.00 ppb measured ozone and no ion stage. | Large open-plan rooms | 391CFM smoke ENERGY STAR verified | |
| 3 | No photo The machine that ends the argument Honeywell InSight HPA4300 7.4 CFM per watt, 0.00 ppb, and classified HEPA rather than HEPA-Type. | True HEPA on the lowest power draw | 229CFM smoke AHAM VERIFIDE |
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The picks
Blueair Blue Pure 211i Max
Blueair · model 3613111100 (Blue Pure 211i Max)
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The most air per watt of anything here and by some distance the largest certified coverage — 674 square feet. It does carry an ion generator, which is the reason it is not our asthma pick.
435 smoke / 453 dust / 450 pollen CFM · 444 PM2.5
- Certified room size
- 674 sq ft
- Energy / year
- 256 kWh
- Electricity / year
- $47
- Air per watt
- 9 CFM/W
- Power draw
- 44 W
- Noise
- Not published
- Measured ozone
- 2 ppb
- Filter class
- HEPA-Type
Ion generator — fitted
The two registers disagree: AHAM classifies this model 'Fan Filter with Ion Generator' while ENERGY STAR records it as 'Fan and Filter'. ENERGY STAR's measured ozone figure is 2 ppb. We report both rather than picking the flattering one.
The most air per watt of anything on this site — 9.0 CFM per watt — and 674 certified square feet, which is the largest coverage we cover, for $47 a year. For a large open-plan space with no asthma in the household, this is a genuinely hard machine to argue against.
The honest con: the ion generator, the 2 ppb, and the fact that Blueair does not document the stage as switchable. Also HEPA-Type rather than HEPA on the register.
LEVOIT Core 600S
LEVOIT · model Core 600S (LAP-C601S-WUS)
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391 certified smoke CADR is real large-room capability, and it is honest about needing 387 kWh a year to deliver it — the highest electricity bill of any unit we recommend.
391 smoke / 398 dust / 436 pollen CFM · 394 PM2.5
- Certified room size
- 606 sq ft
- Advertised coverage
- 2,909 sq ft at 1 air change per hour
- Energy / year
- 387 kWh
- Electricity / year
- $71
- Air per watt
- 6 CFM/W
- Power draw
- 49 W
- Noise
- 26-55 dB
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 550 sq ft
- Clears it (367 needed)
No ionizer — filtration only
ENERGY STAR classifies this unit 'Fan and Filter', 0.00 ppb measured ozone.
391 certified smoke CADR across 606 certified square feet with 0.00 ppb measured ozone and no ion generator at all. If the zero is what you came for, this is the largest machine that delivers it.
The honest con: $71 a year against the Blueair’s $47 for less coverage. That is the price of the zero, stated plainly. If your room is under 358 square feet, the Core 400S is the right size and cheaper on both counts.
Honeywell InSight HPA4300
Honeywell · model HPA4300B
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The efficiency winner among true-HEPA units at living-room size: 229 certified smoke CADR on 31 watts, zero measured ozone, and a filter the register classifies as HEPA rather than HEPA-Type.
229 smoke / 238 dust / 245 pollen CFM · 233 PM2.5
- Certified room size
- 354 sq ft
- Energy / year
- 185 kWh
- Electricity / year
- $34
- Air per watt
- 7.4 CFM/W
- Power draw
- 31 W
- Noise
- Not published
- Measured ozone
- 0 ppb
- Filter class
- HEPA
- AHAM rule, 300 sq ft
- Clears it (200 needed)
No ionizer — filtration only
Both registers classify this unit as fan-and-filter only.
Buyer-first, so we will say it: neither brand wins this comparison outright, and the Honeywell HPA4300 takes both arguments away. 7.4 CFM per watt is better than any LEVOIT. 0.00 ppb measured ozone with no ion generator matches any LEVOIT. And the register classifies its filter HEPA rather than HEPA-Type, which neither Blueair nor LEVOIT achieves. At $34 a year it is also the cheapest here to run.
The honest con: 354 certified square feet caps it well below the Blueair, Honeywell publishes no noise figure we could source, and it has none of the app control, scheduling or air-quality sensing that both of the other brands sell on.
The verdict
Common questions
Is Blueair or LEVOIT better?
Do Blueair purifiers produce ozone?
Are Blueair and LEVOIT filters True HEPA?
Which brand is cheaper to run?
Sources
- AHAM VERIFIDE directory of certified room air cleaners
- ENERGY STAR certified room air cleaners database
- EPA — Guide to Air Cleaners in the Home
Figures were read on the dates shown against each source. If one has changed, or if we have got something wrong, tell us and we will correct the page.
Read next
- CADR & costLEVOIT vs CowayBrand-level comparison on certified coverage, running cost and which models are actually in a register.
- AllergiesHEPA vs ionizers vs ozone generatorsWhat EPA advises about ionizers and ozone, with published measurements for every certified unit.
- Room sizeLEVOIT Core 400S vs Core 600SIdentical on ozone, ionizer and filter class. Separated only by 231 CFM against 391 — and the crossover lands at 358 sq ft.