Best Air Purifiers for Allergies, Judged on Pollen and Dust CADR
The best air purifiers for allergies, ranked on AHAM pollen and dust CADR, sealed HEPA filtration and filter cost: Honeywell HPA300, Levoit Core 400S-P and more.
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The best air purifier for allergies is the Honeywell HPA300. AHAM Verifide rates it at 300 cfm for pollen, 320 for dust and 300 for smoke, for a 465 square foot room, which is more certified airflow for the large particles that trigger allergies than anything else at its price. If you want an auto mode that reacts when you vacuum or open a window, the Levoit Core 400S-P pairs a laser particle sensor with 257 to 259 cfm of certified pollen CADR.
Allergy triggers indoors are mostly large particles: pollen, pet dander, mold spores and dust mite debris. The EPA lists dust mites, pet dander and mold among common indoor triggers and recommends a HEPA air cleaner as one way to reduce them. Large particles settle quickly, so the purifier has to be in the room where you breathe them and run continuously. A purifier reduces exposure; it does not treat allergies.
Our top picks at a glance
1. Best for allergies
Honeywell HPA300 (HPA304)Pollen CADR: 300 cfm (AHAM) · Dust CADR: 320 cfm (AHAM) · Room size: 465 sq ft (AHAM) · Sensor: None
2. Best allergy purifier with auto mode
Levoit Core 400S-PPollen CADR: 257 to 259 cfm (AHAM) · Dust CADR: 233 to 240 cfm (AHAM) · Room size: 358 to 363 sq ft (AHAM) · Sensor: Laser PM2.5
3. Best for pet allergies
Levoit Vital 200S-PPollen CADR: 289 cfm (AHAM) · Dust CADR: 254 cfm (AHAM) · Room size: 388 sq ft (AHAM) · Sensor: Infrared, Auto Mode
4. Best for allergies at night
Blueair Blue Pure 411i Max (2-pack)Pollen CADR: 180 cfm (AHAM) · Dust CADR: 163 cfm (AHAM) · Room size: 225 sq ft (AHAM) · Sensor: Particle sensor
5. Best for a large open room
Blueair Blue Pure 211i MaxPollen CADR: Not listed in AHAM's entry · Dust CADR: 453 cfm (AHAM) · Room size: 674 sq ft (AHAM) · Sensor: Particle sensor
| Pick | Pollen CADR | Dust CADR | Room size | Sensor | Buy |
|---|---|---|---|---|---|
| Honeywell HPA300 (HPA304)Best for allergies | 300 cfm (AHAM) | 320 cfm (AHAM) | 465 sq ft (AHAM) | None | Amazon |
| Levoit Core 400S-PBest allergy purifier with auto mode | 257 to 259 cfm (AHAM) | 233 to 240 cfm (AHAM) | 358 to 363 sq ft (AHAM) | Laser PM2.5 | Amazon |
| Levoit Vital 200S-PBest for pet allergies | 289 cfm (AHAM) | 254 cfm (AHAM) | 388 sq ft (AHAM) | Infrared, Auto Mode | Amazon |
| Blueair Blue Pure 411i Max (2-pack)Best for allergies at night | 180 cfm (AHAM) | 163 cfm (AHAM) | 225 sq ft (AHAM) | Particle sensor | Amazon |
| Blueair Blue Pure 211i MaxBest for a large open room | Not listed in AHAM's entry | 453 cfm (AHAM) | 674 sq ft (AHAM) | Particle sensor | Amazon |
Best for allergies
Honeywell HPA300 (HPA304)
The most certified pollen and dust airflow for the money, from three HEPA filters and a carbon pre-filter.
- Pollen CADR
- 300 cfm (AHAM)
- Dust CADR
- 320 cfm (AHAM)
- Room size
- 465 sq ft (AHAM)
- Sensor
- None
Pros
- High certified dust CADR
- Five-year warranty
- Mechanical filtration (CARB)
Cons
- No auto mode
- Three R filters and four pre-filters a year
For a living room or large bedroom in allergy season, the HPA300 moves a lot of certified air through HEPA media. Its pre-filter catches lint and hair before the HEPA filters, which matters in homes with pets. You pay with upkeep and a loud top speed. Run it on a middle setting all day and high when you clean. Our HPA300 review details the filter routine.
Best allergy purifier with auto mode
Levoit Core 400S-P
A laser sensor that raises the fan when you vacuum or dust, on 257 to 259 cfm of certified pollen CADR.
- Pollen CADR
- 257 to 259 cfm (AHAM)
- Dust CADR
- 233 to 240 cfm (AHAM)
- Room size
- 358 to 363 sq ft (AHAM)
- Sensor
- Laser PM2.5
Pros
- Reacts to dust kicked up by cleaning
- 38 W
- Pet Allergy filter option
Cons
- Levoit's filter page gives no interval
- Not enough for a very large room
Allergen exposure spikes when particles are disturbed, when you make the bed, vacuum or let the dog in. A laser sensor sees that spike and raises the fan within seconds, which a fixed-speed purifier cannot do. Levoit sells a Pet Allergy version of the filter. See the Core 400S-P review.
Best for pet allergies
Levoit Vital 200S-P
289 cfm of certified pollen CADR and a second inlet that keeps fur off the filter.
- Pollen CADR
- 289 cfm (AHAM)
- Dust CADR
- 254 cfm (AHAM)
- Room size
- 388 sq ft (AHAM)
- Sensor
- Infrared, Auto Mode
Pros
- Highest pollen CADR among mid-size picks
- Pet Mode
- Mechanical filtration (CARB)
Cons
- $59.99 filters
- Less precise sensor than the Core 400S-P
Pet dander is a large, light particle, and the Vital 200S-P's pollen CADR, the figure for large particles, is the best here for a mid-size machine. If a dog or cat is the trigger, this is the pick; read our pet guide too.
Best for allergies at night
Blueair Blue Pure 411i Max (2-pack)
A quiet bedroom purifier with 180 cfm of certified pollen CADR for a 225 sq ft room.
- Pollen CADR
- 180 cfm (AHAM)
- Dust CADR
- 163 cfm (AHAM)
- Room size
- 225 sq ft (AHAM)
- Sensor
- Particle sensor
Pros
- 18 dB low setting (Blueair listing)
- 2.5 to 20 W
- Auto brightness
Cons
- Electrostatic stage
- Bedroom-sized only
Allergy symptoms are often worst on waking. A quiet purifier that runs all night in a closed bedroom keeps particle levels low through those hours. The 411i Max does that on very little power. See our 411i Max review.
Best for a large open room
Blueair Blue Pure 211i Max
453 cfm of certified dust CADR for 674 sq ft, efficient enough to run all season.
- Pollen CADR
- Not listed in AHAM's entry
- Dust CADR
- 453 cfm (AHAM)
- Room size
- 674 sq ft (AHAM)
- Sensor
- Particle sensor
Pros
- Highest dust CADR here
- AllergenBlock filter option
- 46 W
Cons
- AHAM's entry has no pollen figure
- Electrostatic stage
For an open plan room where allergy sufferers spend the day, the 211i Max's certified dust CADR of 453 cfm is unmatched in this guide. Blueair sells an AllergenBlock filter for it. More in our 211i Max review.
How we chose allergy purifiers
For allergies we weighted AHAM's pollen and dust CADR more heavily than in our other guides, because most indoor allergens are larger particles than smoke. All figures are from the AHAM Verifide directory. We then checked each maker's filter type and cost, and preferred purifiers that can run all day at a livable noise level.
Allergy purifier buying guide
Which allergens a purifier can catch
| Allergen | Airborne? | Does a purifier help? | Also do |
|---|---|---|---|
| Pollen | Yes, for a while after it enters | Yes, with high pollen CADR | Keep windows closed on high pollen days |
| Pet dander | Yes, stays airborne longer than pollen | Yes | Keep pets out of the bedroom |
| Dust mite debris | Briefly, when disturbed | Partly; it settles fast | Allergen-proof mattress and pillow covers, hot washes |
| Mold spores | Yes | Yes, for airborne spores | Fix the moisture source |
Run it all the time, in the right room
Allergens keep coming in on clothes, pets and open doors, and dust mite debris is stirred up every time you move bedding. A purifier switched on only when you sneeze is always catching up. Run it continuously on a low or auto setting in the room where you spend the most hours, which for most people is the bedroom.
Size up for allergy season
Five air changes an hour is our baseline. In spring pollen season or with a shedding pet, sizing for six to seven lets the purifier keep levels lower. Use our sizing calculator.
Change filters on time
A clogged filter cuts airflow, and the CADR falls with it. Mark the date when you fit a filter, vacuum pre-filters as the manual asks, and in a heavy pollen season expect to replace filters sooner than the maker's typical interval.
What to skip
- Ionizers as a substitute for HEPA. They can make particles stick to walls and furniture, where they are disturbed again later.
- Medical claims. No purifier is approved to treat allergies; talk to a doctor about treatment.
- Undersized units. A small purifier in a big room on high is loud and still slow.
For asthma specifically, see the asthma guide; for pets, the pet guide.
Frequently asked questions
What is the best air purifier for allergies?
The Honeywell HPA300: AHAM rates it at 300 cfm pollen, 320 dust and 300 smoke CADR for 465 sq ft. For an auto mode, the Levoit Core 400S-P is certified at 257 to 259 cfm pollen CADR with a laser sensor.
Do air purifiers help with allergies?
They reduce airborne allergens such as pollen, pet dander and mold spores in the room where they run. The EPA recommends a HEPA air cleaner as one step against indoor asthma and allergy triggers, alongside source control. They do not treat allergies.
Which CADR matters most for allergies?
Pollen and dust CADR, because pollen, dander and dust mite debris are larger particles. Smoke CADR still matters if smoke or fine particles are also a trigger.
Should I run an air purifier all night for allergies?
Yes. Run it continuously in the bedroom with the door closed, on a quiet setting, so allergen levels stay low through the night.
Do air purifiers help with dust mite allergies?
Only partly. Dust mite debris is heavy and settles quickly, so the EPA's advice centers on allergen-proof covers for mattresses and pillows and regular hot washing of bedding.
How often should I change the filter in allergy season?
At least as often as the maker says, and sooner in heavy pollen or shedding seasons, because a loaded filter reduces airflow.
Sources
- AHAM Verifide Directory: Certified Room Air Cleaners, Association of Home Appliance Manufacturers
- Asthma Triggers: Gain Control, US Environmental Protection Agency
- Guide to Air Cleaners in the Home, US Environmental Protection Agency
- List of CARB-Certified Air Cleaning Devices, California Air Resources Board
- Honeywell True HEPA Air Purifier, HPA300, Honeywell Store
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