What is the best air purifier for allergies?

For most rooms, the Dreo Macro Max AS: true HEPA, 336 pollen CADR, certified for 456 sq ft. For a bigger room, the Wozoyo Pure Air PA6 (431 pollen CADR, 563 sq ft). For a small bedroom, the Dreo 338 (178 sq ft).

Which CADR number matters for allergies?

Pollen CADR for pollen and mold, dust CADR for dust and pet dander. AHAM tests three particles: smoke, dust and pollen, which EPA says stand for small, medium and large particles. Pollen is the biggest and the easiest to catch, so pollen CADR usually runs higher than smoke CADR: it does on 25 of the 30 purifiers on this page.

Do I need a true HEPA filter for allergies?

It is the safe choice. EPA says a HEPA filter, as the U.S. Department of Energy defines it, "can theoretically remove at least 99.97% of dust, pollen, mold, bacteria" and other particles of 0.3 microns. Words like "HEPA-type" or "HEPA-grade" do not promise that. We go by how AHAM files each filter.

Do air purifiers really help with allergies?

Somewhat. EPA: "Multiple studies with portable HEPA air cleaners have found improvements in one or more allergy and/or asthma symptom(s)." It also says "The studies do not always show major improvements."

What size air purifier do I need for allergies?

One AHAM certifies for your room or bigger. AHAM's rule of thumb is a CADR of at least two-thirds of the room's square feet, and its room size already follows it. Ignore the listing's room size: the Wozoyo Pure Air PA2 listing says up to 563 sq ft; AHAM certifies it for 116.

Should I run my air purifier all the time in allergy season?

Yes. EPA: "The longer the air cleaner runs, the more air it filters." Higher speeds filter more air too. Put it in the room you spend the most time in, away from curtains and anything that blocks the air.

How much do allergy purifier filters cost a year?

Genuine filters on Amazon today, on each maker's schedule: Dreo Macro Max AS: $44.99, every 6 months, about $90 a year; Dreo 338: $21.79, every 6 months, about $44 a year.

Should I buy cheaper copy filters?

Not if you count on the purifier for allergies. AHAM warns that for people who use an air cleaner "to manage allergy symptoms," a filter that is not genuine can be a health risk, not just a bad buy.

Are ionizer air purifiers safe for allergies and asthma?

Skip anything that makes ozone. EPA: "Avoid portable air cleaners ... that intentionally produce ozone. Ozone is a lung irritant." California (CARB) tests air cleaners for ozone; every pick here is on its list.

Best Air Purifier for Allergies (2026): HEPA Picks by Room Size

The best air purifier for allergies is the Dreo Macro Max AS: 336 pollen CADR, certified for rooms up to 456 sq ft, $149.99. It has a true HEPA filter and the most pollen cleaning per dollar of the true HEPA purifiers we could buy today.

Best for most rooms

Dreo Macro Max AS

$149.99 on Amazon

Check price on Amazon

AHAM-certified pollen CADR of 336 (dust 306, smoke 294), for rooms up to 456 sq ft.
True HEPA filter, as AHAM files it. The most pollen CADR per dollar of the 7 true HEPA purifiers certified for 300 sq ft or more that we could buy today.
A washable pre-filter in front catches lint and hair, so the HEPA filter lasts (the maker's page).
On California's (CARB) list of air cleaners tested for ozone. ENERGY STAR, 48 W.
Genuine filter: $44.99, changed every 6–8 months by the maker's schedule: about $90 a year.

Which one is right for you?

For a large living room or open plan (up to 563 sq ft)
Wozoyo Pure Air PA6 · 431 pollen CADR · True HEPA + carbon
The most pollen CADR per dollar of the true HEPA purifiers certified for 500 sq ft or more.
$249.99 on Amazon
For a small bedroom (up to 178 sq ft)
Dreo 338 · 131 pollen CADR · True HEPA
The cheapest true HEPA purifier AHAM certifies for 150 sq ft or more. Run it in the room where you sleep.
$59.98 on Amazon
Cheapest, for an office or nursery (up to 116 sq ft)
Wozoyo Pure Air PA2 · 114 pollen CADR · True HEPA + carbon
The cheapest true HEPA purifier we could buy today. It is too small for a bedroom.
$67.99 on Amazon
Allergic to a dog or cat (up to 410 sq ft)
Winix AT40 · 244 pollen CADR · 259 dust CADR · True HEPA + carbon
Our top pick for pets: true HEPA for dander and carbon for odor. EPA says dust CADR stands for medium-size particles.
$192.57 on Amazon
For the whole house
A MERV 13 furnace filter · If you have central heat or air
It cleans the air only while the system runs. EPA: that is "usually less than 25% of the time" in heating and cooling season. Use it with a purifier, not instead of one.
Find your furnace filter size

Prices are Amazon's on November 11, 2026. Room sizes are AHAM-certified, not the listing's. Every pick is true HEPA as AHAM files it and on CARB's ozone-tested list.

By Erin Rose · Updated November 11, 2026

01 / Size

How big a purifier you need for allergies

Buy for your room size, then compare pollen CADR. AHAM certifies each purifier for a room size: the room it can clean about 4.8 times an hour, worked out from its smoke CADR (room size = smoke CADR x 1.55, with an 8-foot ceiling).

Smoke particles are the smallest of AHAM's three tests. Pollen grains are much bigger and easier to catch, so a purifier sized for your room clears pollen faster still. If your ceilings are over 8 feet, AHAM says to buy one rated for a bigger room.

True HEPA purifiers certified for each room size, and the cheapest one today
Room	CADR needed	True HEPA units	Cheapest today
100 sq ft	65	12 of 12	Dreo 338 · 131 pollen CADR · $59.98
150 sq ft	97	11 of 12	Dreo 338 · 131 pollen CADR · $59.98
200 sq ft	129	8 of 12	Dreo DR-HAP009AS · 163 pollen CADR · $107.93
300 sq ft	194	7 of 12	Dreo Macro Max AS · 336 pollen CADR · $149.99
400 sq ft	258	5 of 12	Dreo Macro Max AS · 336 pollen CADR · $149.99
500 sq ft	323	2 of 12	Wozoyo Pure Air PA6 · 431 pollen CADR · $249.99

CADR needed = smoke CADR: room ÷ 1.55, AHAM's room-size rule (about two-thirds of the square feet). True HEPA units = how many true HEPA purifiers on CARB's list that we could buy today. 8-foot ceilings.

02 / Allergies

What else matters for allergies

True HEPA, not "HEPA-type".EPA: a HEPA filter, as the U.S. Department of Energy defines it, can remove "at least 99.97%" of particles of 0.3 microns. Bigger particles, like pollen, are caught even better.
Run it all day, where you spend the most time.EPA: "The longer the air cleaner runs, the more air it filters." And: "Consider placing the unit in the room(s) you spend the most time in."
Keep it in the open.EPA: "Keep air cleaners away from curtains and anything that might block airflow."
Use the genuine filter.AHAM warns that for people who rely on an air cleaner "to manage allergy symptoms," a filter that is not genuine can be a health risk.
Expect help, not a cure.EPA: studies of HEPA air cleaners found improvements in allergy and asthma symptoms, but "do not always show major improvements."
No ozone.EPA: avoid air cleaners "that intentionally produce ozone. Ozone is a lung irritant." Every pick here is on California's ozone-tested list.

03 / Every one in stock

All 30 certified purifiers we could buy today

All 30 certified purifiers we could buy today: Pollen CADR, Dust CADR, Room, Filter and Amazon price
Purifier	Pollen CADR	Dust CADR	Room	Filter	Price	Buy
True HEPA, for rooms 300 sq ft and up
Wozoyo Pure Air PA6	431	372	563 sq ft	True HEPA + carbon	$249.99	Buy
Whirlpool WPPRO2000	381	339	529 sq ft	True HEPA	$349.99	See Winix 9800 on Amazon
Dreo Macro Max ASsold by Amazon	336	306	456 sq ft	True HEPA	$149.99	Buy
Winix T810sold by Amazon	277	272	418 sq ft	True HEPA	$175.99	Buy
Winix C610	262	252	384 sq ft	True HEPA	$176.49	Buy
GermGuardian AC3200sold by Amazon	258	230	348 sq ft	True HEPA	$229.99	Buy
Winix 5510sold by Amazon	247	252	392 sq ft	True HEPA + carbon	$179.99	Buy
Winix 5520sold by Amazon	247	252	392 sq ft	True HEPA + carbon	$179.99	See Winix AT40 on Amazon
Winix 5530sold by Amazon	247	252	392 sq ft	True HEPA + carbon	$219.99	See Winix AT40 on Amazon
Honeywell HPA4300Bsold by Amazon	245	238	354 sq ft	True HEPA	$158.11	Buy
GermGuardian AP3250sold by Amazon	245	226	345 sq ft	True HEPA	$229.99	Buy
Winix AT40sold by Amazon	244	259	410 sq ft	True HEPA + carbon	$192.57	Buy
GermGuardian AC3250sold by Amazon	238	233	347 sq ft	True HEPA	$239.99	Buy
True HEPA, for rooms under 300 sq ft
Dreo DR-HAP009ASsold by Amazon	163	161	225 sq ft	True HEPA	$107.93	Buy
Whirlpool WPT80	162	137	199 sq ft	True HEPA	$149.29	Buy
GermGuardian AC5250PTsold by Amazon	138	132	189 sq ft	True HEPA	$149.99	Buy
Dreo 338sold by Amazon	131	121	178 sq ft	True HEPA	$59.98	Buy
GermGuardian AC4825Esold by Amazon	129	116	153 sq ft	True HEPA	$124	Buy
Wozoyo Pure Air PA2	114	84	116 sq ft	True HEPA + carbon	$67.99	Buy
GermGuardian AC4300sold by Amazon	106	100	138 sq ft	True HEPA	$99.99	See KNKA on Amazon
Whirlpool WPT60 (black)	84	79	108 sq ft	True HEPA	$106.69	Buy
Not filed as true HEPA by AHAM
Fellowes AeraMax SVsold by Amazon	450	512	803 sq ft	—	$735	Buy
Levoit Core 600Ssold by Amazon	436	398	606 sq ft	HEPA-type	$259.97	Buy
Blueair Blue Pure 311i Maxsold by Amazon	365	314	439 sq ft	Fabric	$149.99	See Winix AT40 on Amazon
Levoit Vital 200Ssold by Amazon	289	254	388 sq ft	HEPA-type	$169.96	Buy
Blueair DustMagnet 5440isold by Amazon	274	231	335 sq ft	HEPA-type + carbon	$319.99	See Winix AT40 on Amazon
KNKA APH4000	244	226	350 sq ft	HEPA-type + carbon	$99.99	Buy
Levoit Vital 100Ssold by Amazon	173	161	222 sq ft	HEPA-type	$113.99	Buy
Levoit Core 300sold by Amazon	167	153	222 sq ft	HEPA-type	$84.99	Buy
Levoit Core Minisold by Amazon	61	39	53 sq ft	HEPA-type	$39.99	Buy

Pollen CADR, dust CADR, room size and filter type are AHAM-certified. A dash means AHAM does not list the filter type. Listings in a paid campaign are left out. Prices read live November 11, 2026. See every certified unit, in stock or not, on our main purifier guide.

04 / Questions

Frequently asked

What is the best air purifier for allergies?: For most rooms, the Dreo Macro Max AS: true HEPA, 336 pollen CADR, certified for 456 sq ft. For a bigger room, the Wozoyo Pure Air PA6 (431 pollen CADR, 563 sq ft). For a small bedroom, the Dreo 338 (178 sq ft).
Which CADR number matters for allergies?: Pollen CADR for pollen and mold, dust CADR for dust and pet dander. AHAM tests three particles: smoke, dust and pollen, which EPA says stand for small, medium and large particles. Pollen is the biggest and the easiest to catch, so pollen CADR usually runs higher than smoke CADR: it does on 25 of the 30 purifiers on this page.
Do I need a true HEPA filter for allergies?: It is the safe choice. EPA says a HEPA filter, as the U.S. Department of Energy defines it, "can theoretically remove at least 99.97% of dust, pollen, mold, bacteria" and other particles of 0.3 microns. Words like "HEPA-type" or "HEPA-grade" do not promise that. We go by how AHAM files each filter.
Do air purifiers really help with allergies?: Somewhat. EPA: "Multiple studies with portable HEPA air cleaners have found improvements in one or more allergy and/or asthma symptom(s)." It also says "The studies do not always show major improvements."
What size air purifier do I need for allergies?: One AHAM certifies for your room or bigger. AHAM's rule of thumb is a CADR of at least two-thirds of the room's square feet, and its room size already follows it. Ignore the listing's room size: the Wozoyo Pure Air PA2 listing says up to 563 sq ft; AHAM certifies it for 116.
Should I run my air purifier all the time in allergy season?: Yes. EPA: "The longer the air cleaner runs, the more air it filters." Higher speeds filter more air too. Put it in the room you spend the most time in, away from curtains and anything that blocks the air.
How much do allergy purifier filters cost a year?: Genuine filters on Amazon today, on each maker's schedule: Dreo Macro Max AS: $44.99, every 6 months, about $90 a year; Dreo 338: $21.79, every 6 months, about $44 a year.
Should I buy cheaper copy filters?: Not if you count on the purifier for allergies. AHAM warns that for people who use an air cleaner "to manage allergy symptoms," a filter that is not genuine can be a health risk, not just a bad buy.
Are ionizer air purifiers safe for allergies and asthma?: Skip anything that makes ozone. EPA: "Avoid portable air cleaners ... that intentionally produce ozone. Ozone is a lung irritant." California (CARB) tests air cleaners for ozone; every pick here is on its list.

References

Sources

8 references · prices on November 11, 2026

1
AHAM Verifide directory of certified room air cleaners

Pollen, dust and smoke CADR, certified room size, filter type and ENERGY STAR for every purifier on this page.
2
AHAM Verifide: Air Filtration Standards

Read October 23, 2026. "the CADR of your air cleaner should be equal to at least two-thirds of the room's area"; genuine filters for allergy users.
3
AHAM: Portable Air Cleaners and Air Changes per Hour (white paper, October 2021)

Read October 23, 2026. Room size = smoke CADR x 1.55, about 4.8 air changes an hour; the pollen test uses paper mulberry pollen, the large particle.
4
U.S. EPA: Guide to Air Cleaners in the Home

Read October 23, 2026. Small, medium and large particles; allergy and asthma studies; run time and placement; HVAC filters; avoid ozone.
5
U.S. EPA: What is a HEPA filter?

Read October 23, 2026. At least 99.97% of particles of 0.3 microns, as the U.S. Department of Energy defines it.
6
California Air Resources Board: list of CARB-certified air cleaning devices

Read October 20, 2026. Certification covers ozone and electrical safety, not cleaning performance.
7
Maker filter pages: replacement intervals and pre-filters

Each maker's own page or manual, read October 20, 2026.
8
Amazon listings: price, seller and stock

Read live on November 11, 2026. A price shows only if the listing could be bought that day.

How big a purifier you need for allergies

What else matters for allergies

All 30 certified purifiers we could buy today

Frequently asked

Related

Sources