Best Air Purifiers for Pollen: 7 HEPA Picks by Room Size

What an air purifier can and cannot do for pollen

• EPA says the most effective ways to improve indoor air are to reduce or remove pollutant sources and to ventilate with clean outdoor air, and adds that research shows filtration can be an effective addition to those two steps.
• On allergy symptoms, EPA's answer for portable HEPA air cleaners is "possibly": multiple studies found improvements in one or more symptoms, but the studies do not always show major improvements and do not show improvements in all symptoms.
• AAFA's pollen allergy page lists central air conditioning or air cleaners with a Certified Asthma & Allergy Friendly filter and/or HEPA filtration among the ways to reduce indoor airborne allergens, including pollen that comes in through doors, windows, clothes and pets.
• AAFA notes that freestanding air cleaners only filter air in a limited area. A purifier also does not remove pollen that has already settled on bedding, floors or fabric, so it is one step in a plan rather than a fix on its own.

If allergy symptoms are severe or persistent, see a doctor. A purifier is not a treatment, and this guide is shopping research, not medical advice.

How to size an air purifier for your room

Match the CADR (clean air delivery rate) to the room. EPA's sizing table for particle removal lists a minimum CADR of 65 CFM for a 100 square foot room, 130 for 200, 195 for 300, 260 for 400, 325 for 500 and 390 for 600, calculated for 8-foot ceilings.

• Packaging that lists CADRs gives three numbers, for tobacco smoke, dust and pollen. EPA says they stand for small, medium and large particles. The smoke number is the strictest of the three, so the picks below are sized by smoke CADR where the listing gives one.
• A maker's largest room figure is usually one air change an hour, which is slower. Levoit's pages also give a smaller room at 4.8 air changes an hour: 219 square feet for the Core 300S, 358 for the Core 400S, 606 for the Core 600S and 222 for the Vital 100S.
• EPA says higher fan speeds and longer run times increase the amount of air filtered, so a unit sized close to its limit has to run on a higher, louder setting.
• EPA says a room with ceilings higher than 8 feet may call for a higher CADR than the table shows.

Ozone and ionizers: what to avoid

• EPA says to avoid portable air cleaners that intentionally produce ozone, which it calls a lung irritant, and notes that air cleaners containing electrostatic precipitators, ionizers or plasma may have the potential to emit ozone.
• AAFA's dust mite page says to avoid devices that treat air with heat, electrostatic ions or ozone because they can pollute the air and irritate the lungs, especially with asthma.
• Every pick below is a filter-based unit. Alen says the 45i has an ionizer feature that you can turn on or off, so if you buy it, consider leaving that feature off.

Pollen-season habits that go with a purifier

AAFA's pollen allergy page lists these steps alongside air cleaning:

• Keep windows closed, if possible, during pollen season or peak pollen times.
• Remove your shoes before entering your home.
• Shower before going to bed, which AAFA says removes pollen from your body and keeps it off your bedding.
• Change and wash clothes worn during outdoor activities, and dry clothes in a dryer or on an indoor rack rather than an outdoor line.
• Check local pollen counts and forecasts. AAFA notes that counts are more accurate than forecasts.

7 picks and who each one suits

1. Levoit Core 400S-P Smart Air Purifier

   Best for: A bedroom or living room of roughly 350 square feet or less, or a larger room if one air change an hour is enough.

   The listing says it is AHAM Verified with CADR ratings of 231 CFM for smoke, 240 for dust and 259 for pollen, and that its main filter captures 99.97 percent of particles down to 0.3 micron, including pollen, dust and pet dander. Levoit's Core 400S page gives 1,718 square feet at one air change an hour or 358 square feet at 4.8, noise levels as low as 24 dB and a 2-year limited warranty; the 400S-P listing gives the same coverage and CADR figures. By EPA's table, a smoke CADR of 231 matches a room of about 350 square feet.

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2. Levoit Core 300S-P Smart Air Purifier

   Best for: A small bedroom, nursery or home office of roughly 200 square feet.

   The listing says it is AHAM Verified with CADR ratings of 141 CFM for smoke, 156 for dust and 175 for pollen, runs as quietly as 22 dB and has an activated carbon filter for odors. Levoit's Core 300S page lists 1,051 square feet at one air change an hour or 219 square feet at 4.8, and names Ozone Free among its features.

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3. Levoit Core 600S-P Smart Air Purifier

   Best for: A large living room, basement or open floor plan where a smaller unit would be undersized.

   The listing gives a CADR of 391 CFM and says it is AHAM Verified, with 99.97 percent filtration efficiency for 0.1 to 0.3 micron particles including pollen, dust and animal dander. It adds that the unit is HEPA-grade in Sleep Mode with Levoit's original filter, per an independent lab. Levoit's page lists 2,909 square feet at one air change an hour or 606 at 4.8, and noise from 26 to 55 dB. EPA's table lists a minimum CADR of 390 for a 600 square foot room.

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4. Coway Airmega Mighty2 (AP-1512N)

   Best for: A living room or open space where you want a filter-life readout and a washable pre-filter.

   Coway's page lists CADR ratings of 240 for smoke, 242 for dust and 249 for pollen, 1,800 square feet at one air change an hour, and a filter that captures over 99.97 percent of 0.3 micron particles, including allergens, mold spores and pollen. The pre-filter is washable and vacuumable, and the unit is Quiet Mark certified, according to Coway. By EPA's table, a smoke CADR of 240 matches a room of about 370 square feet, so treat the 1,800 square foot figure as the slow, one-change-an-hour case.

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5. Levoit Vital 100S-P Smart Air Purifier

   Best for: A small bedroom or home office, or a home with a pet, where a washable pre-filter matters.

   The listing says it is AHAM Verified, cleans a room as large as 222 square feet 4.8 times an hour or up to 1,073 square feet once an hour, and captures 99.97 percent of 0.1 to 0.3 micron particles such as pollen, dust and pet dander. Levoit's page lists a CADR of 143 CFM, noise from 23 to 52 dB and a washable pre-filter, and the listing says a wide U-shaped inlet traps airborne pet fur.

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6. Alen BreatheSmart 45i with Essential filter

   Best for: Someone who wants a large-room unit from a model line that AAFA lists as Asthma & Allergy Friendly.

   AAFA's certified portable air cleaner list names the Alen BreatheSmart 45i; the list does not say which filter. The listing says the Essential filter captures 99.9 percent of airborne particles as small as 0.1 micron, covers up to 1,900 square feet, runs as low as 24 dB and has a 9 to 12 month filter life. Alen says the 45i has an ionizer feature you can turn on or off; AAFA advises avoiding devices that treat air with electrostatic ions, so consider leaving it off. Amazon showed limited stock at time of writing.

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7. Rabbit Air MinusA2 SPA-780N

   Best for: A bedroom or main room where you want a wall-mountable unit that AAFA lists as Asthma & Allergy Friendly.

   AAFA's certified portable air cleaner list names the Rabbit Air MinusA2 SPA-780N. Rabbit Air's page describes six-stage filtration with a BioGS HEPA filter and an activated carbon filter, says it covers up to 815 square feet and can purify 6,520 cubic feet of air in 30 minutes, and offers floor standing or wall mounting with a five-year warranty. The page does not publish a CADR, so you cannot size it against EPA's table; treat 815 square feet as the maker's figure.

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Frequently asked questions

Do air purifiers help with pollen allergies?

EPA's answer for portable HEPA air cleaners is possibly: multiple studies found improvements in one or more allergy or asthma symptoms, but not always major ones and not in every symptom. AAFA lists air cleaners with HEPA or a Certified filter among the ways to reduce indoor airborne allergens, alongside closed windows.

What CADR do I need for pollen season?

Size by room area. EPA's table lists a minimum CADR of 65 for 100 square feet, 195 for 300 and 390 for 600, with 8-foot ceilings. Pollen is the large-particle example in the smoke, dust and pollen ratings, so the smoke CADR is the stricter number to check.

Should an air purifier go in the bedroom?

AAFA's dust mite page says freestanding air cleaners only filter air in a limited area and suggests using them in your bedroom. For a larger open space, pick a unit whose CADR matches the whole room, and keep the doors and windows closed while it runs.

Are ionizer or ozone air purifiers a good choice for allergies?

No. EPA says to avoid air cleaners that intentionally produce ozone, and AAFA says to avoid devices that treat air with heat, electrostatic ions or ozone because they can irritate the lungs. Choose a filter-based HEPA unit, and check whether a model has an ionizer feature you can switch off.

How we chose

This guide is desk research. We compared the Amazon listing and the maker's page for each purifier with EPA's Guide to Air Cleaners in the Home, AAFA's pollen allergy and dust mite pages and AAFA's certified portable air cleaner list. We kept portable HEPA purifiers with a published coverage or CADR figure and left out ozone generators and ionizer-only devices. We did not test any of these purifiers; coverage, CADR and noise figures are the makers' or the listings' own, and a listing describes what its seller says, not how a unit performs in your home.

Listings, sellers and stock change quickly. At time of writing (October 29, 2026), every "Check price on Amazon" button on this page went to an exact Amazon listing for the product named, new and in stock, with limited stock on the Alen 45i. Prices are not shown because they change. Confirm the model, filter and seller on the listing before you buy.

Related guides

• Air purifiers for dust-mite allergies: what a purifier can and cannot do for dust mites.
• Air purifiers for mold: HEPA picks for musty rooms, and why moisture comes first.
• Levoit Core 300 review: our review of the related Levoit Core 300.
• Air filters for allergies: furnace and HVAC filters for the whole house.
• Allergy mattress and pillow covers: zippered covers for the bed.
• HEPA vacuums for allergies: vacuums with sealed HEPA filtration.
• Dehumidifiers for every room: humidity control that sits alongside filtration.