Not every one of the best air purifiers is capable of trapping tiny airborne allergens. If hay fever and pet allergies are your main concerns, you want to look for an appliance that can handle such a feat. Most importantly, it has to be equipped with a High-Efficiency Particulate Absorbing (HEPA) filter which can trap up to 99.97% of indoor air pollutants down to 0.3 microns in size. You may also want an air purifier that has extra filters, such as the Levoit Vital 200S and Rabbit Air A3, or an appliance with a built-in UV-C sanitizer — like the GermGuardian AC4825E, for example.
The best air purifiers for allergies can bring relief to your symptoms if you suffer with allergies to airborne particulates. These appliances trap and remove a wide range of pollutants, such as dust, pollen, mold and smoke, leaving you with cleaner, fresher air in your home or workplace. For more information on the potential benefits of air purifiers, scroll down to our Air purifiers for allergies FAQs section.
All air purifiers in this guide were thoroughly tested by our expert team using the same testing protocol. We looked into their design, features, ease of use and functionality, and we used an industry-grade air particle monitor to assess their performance. Here is our roundup of the best air purifiers for allergies. But if you are concerned about mold and condensation, consider investing in one of the best dehumidifiers instead.
The quick list
Here are our top picks of the best air purifiers in a ‘quick view’ layout. For more detailed reviews of each air purifier, scroll down and click through to our reviews.
Best overall
The Levoit Core 600S comes out on top with its inconspicuous design, fantastic performance and smart features — and it is reasonably priced, too.
Best budget option
Compact and sleek with great performance, this air purifier is the best budget option for those looking for a good quality air purifier. Perfect for tight spaces.
Best aesthetics
Beautiful to look at but also a beast of performance, this air purifier will add decadence to any home without putting a strain on your energy bill.
Best for monitoring air quality
The Coway Airmega 250 can monitor air pollution which comes in handy for allergies and its tracking features are hard to match.
Best air purifier with humidifier
The Turonic PH950 air purifier will keep the indoor air clean and moisturized making it easier for you to breath. It looks good, too.
Best for pet owners
Great for pet dander and unpleasant smells, this smart air purifier will keep your home free of nasties without generating loads of noise, or breaking the bank.
The best air purifiers for allergies we recommend in 2024: Fully tested by the Live Science team with real-world experience
Why you can trust Live Science Our expert reviewers spend hours testing and comparing products and services so you can choose the best ones for you. Find out more about how we test.
The best air purifier for allergies, overall
✅ You want to use it via an app: Thanks to the easy-to-use app, you can control the air purifier from your smartphone.
✅ You want something fairly quiet: While it's not totally silent, we appreciated how quiet this air purifier was, even without sleep mode.
❌ You have a small space: It's not the smallest unit on the market, so if you're short on space, we think one of the other models on this list would be better suited.
❌ You're on a budget: There are certainly more affordable models out there.
🔎 Levoit Core 600S: It may not be the most compact or good-looking air purifier on the market, but it offers exceptional air-cleaning performance, plenty of smart features and user-friendly design — and it does not cost the earth. ★★★★½
The Levoit 600S is our top choice for an air purifier that effectively captures allergens in your home, and with good reason. Not only did it perform well in all of our tests during our full Levoit Core 600S review, but it's also quiet, easy to use and comes with a range of handy smart features.
Thanks to its True HEPA H13 filter, this air purifier aced our tests under a number of conditions, removing 99.9% of particles smaller than 0.3 microns at certain times. The air purifier also has the ability to capture some bacteria and viruses, and with advanced activated carbon, the machine filters volatile organic compounds from the air.
Not only is the Levoit 600S a powerful air purifier, but it also gains points for its discreet design — the toned-up colors and traditional rectangular shape make it easily blend with most home decors.
We found that setting up the air purifier is easy thanks to the intuitive controls, and there's plenty of information accessible on the app connected to your purifier, which gives you statistics on historical and current air quality within your home, which we thought was a great feature.
On the other hand, the Levoit 600S is quite a bulky machine, so it may not be suitable for tight spaces. It is also relatively expensive so might not be ideal if you're on a budget — but that said, it's still more affordable than some of the Dyson and RabbitAir models, for example.
- Read our full Levoit Core 600S review
| Attributes | Notes |
|---|---|
| Design | Sleek and discreet, but not necessarily small. |
| Performance | Quiet even without sleep mode. |
| Functionality | Controlled from a handy app. |
The best budget air purifier for allergies
✅ You don't want anything complicated: It's easy to use and ready to go right out of the box.
✅ You don't have a lot of room: It stands 22 inches tall and around 10 inches wide, so it's good for slotting into a narrow space.
❌ You want something that blends in: While we wouldn't consider it to be ugly, it doesn't particularly blend in with your interiors.
❌ You want smart features: For that, you're likely going to have to invest a bit more.
🔎 GermGuardian AC4825E: It is compact, easy to use and sleek-looking, but more importantly, this budget-friendly air purifier does a great job of trapping airborne allergens. It does not have any smart features, though. ★★★★
If you’re on a budget and need an air purifier to tackle your allergy symptoms, then the GermGuardian AC4825E will be an inexpensive purchase that can go a long way to help you breathe more easily.
Complete with a HEPA filter and a charcoal filter to filter odors, this appliance can make your living space a nicer place to be. It’s also ultra-quiet, meaning it can work away in the background without distracting you from whatever you're doing.
As you might expect with a smaller unit, the coverage of this air purifier is not quite as extensive as bulkier models. It would be suitable for single rooms, rather than expansive spaces, and stands at just 22 inches tall, meaning it won’t be too disruptive to your room’s decor, although it's not quite sleek enough to blend in.
There are some other handy features too, including a light to indicate a filter change is due and three speeds including an ultra-quiet sleep mode so that you can keep your machine running into the night.
We were impressed by its ability to remove harmful particles in our match and incense tests during our full GermGuardian AC4825E review, especially for its price point. If you want a no-frills, but a very effective air purifier, we’d recommend the GermGuardian.
- Read our full GermGuardian AC4825E review
| Attributes | Notes |
|---|---|
| Design | Small and compact. |
| Performance | Impressive performance for its price. |
| Functionality | Simple controls, no smart features. |
Best looking air purifier for allergies
✅ You want a real looker: This air purifier comes in multiple eye-pleasing designs.
✅ You need an air purifier for a large bedroom: It boasts powerful performance, but it remains whisper-quiet.
❌ You are on a budget: It costs between $749.95 and $769.95, and its filter replacements are expensive, too.
❌ You need to move it around a lot: It does not feature any handles or ridges that would increase its portability.
🔎 RabbitAir A3: This air purifier will be a talking point in your home. It is beautifully designed, whisper-quiet and exceptionally effective at removing airborne allergens. The caveat? The A3 is relatively expensive. It could be more portable, too. ★★★★
If you are looking for a powerful air purifier with a truly unique design, and you need it to cover larger rooms in your home, then the RabbitAir A3 is the ideal choice for you.
This thoughtfully designed air purifier comes in over 10 colorful designs, and it features a neat mood light that can be automatically switched off at night. More importantly, it boasts excellent air-cleaning performance. Certified Asthma & Allergy Friendly by the Asthma and Allergy Foundation of America, the RabbitAir A3 will easily get rid of pollen, pet dander and many other airborne allergens. And because it is Energy Star Certified, it will not put a strain on your energy bill while doing so.
During our RabbitAir A3 air purifier review, we were thoroughly impressed at its functionality. It is relatively large, but light and compact, and it does not make much noise even when kicked into high gear. Unlike many other air purifiers on the market, the RabbitAir A3 can also be mounted on the wall, making it a great option for households with pets or small children. We also liked its user-friendly display, and that it was easily controlled via a handy app.
Moreover, the RabbitAir A3 features a whopping five filters, one of which can be customized to suit your specific needs. For example, you can choose a Germ Defense filter to trap harmful microbes, or opt for a Pet Allergy filter to clear your air of pet dander.
There are, however, several downsides to the RabbitAir A3. This air purifier is relatively expensive, and its filter replacements come at a steep price tag. It is also tricky to move around, as it does not feature any handles or ridges.
- Read our full RabbitAir A3 air purifier review
| Attributes | Notes |
|---|---|
| Design | It comes in over 10 color options, and can be mounted on the wall. |
| Performance | Excellent air-cleaning performance, quiet at use. |
| Functionality | Easy to use and control remotely. |
Best tower fan for allergies
✅ You want something multifunctional: The Dyson Purifier Cool also doubles as a cooling fan.
✅ You want smart features: You can control it with your voice or through the accompanying app.
❌ You're on a budget: It's the most expensive option on this list by a fair shot.
❌ You want something quiet: We noticed that it can get a bit noisy, so it wouldn't be the best option if you want to sleep with it on.
🔎 Dyson Purifier Cool: Sleek, stylish and packed with useful features, this air purifier delivers a great air-cleaning performance. Plus, it keeps you cool during the summer months. However, it is relatively noisy and it requires a steep upfront investment. ★★★★
As with any Dyson product, a sleek and well-engineered design was to be expected of the Dyson Purifier Cool — we think it's one of the most stylish air purifiers on the market. This appliance definitely doesn’t disappoint on those grounds, and has a practical edge too, doubling as a cooling fan, giving you more bang for your buck.
Beyond aesthetics, this purifier also performed exceptionally well in our testing protocol during our full Dyson Purifier Cool review, with our tests concluding that it often captured more than 95% of monitored particles when used at its highest setting for at least 30 minutes.
When it comes to assisting with cleansing the air of allergens, the Dyson Purifier Cool aims to pick up microscopic particles smaller than 2.5 microns, including smoke, bacteria, and allergens — shown as PM 2.5.
If you want your home to be a relief from allergy symptoms - especially in peak pollen season for example — then another neat trick with the Dyson Purifier Cool is that you can set your machine to start working remotely, all from the comfort of your machine’s app.
Though this air purifier might not be within everyone’s price range, it has a lot to deliver, and an eye-catching design to sweeten the deal.
- Read our full Dyson Purifier Cool review
| Attributes | Notes |
|---|---|
| Design | Incredibly sleek and stylish design. |
| Performance | Doubles as a cooling fan. |
| Functionality | Clever smart features. |
Best air purifier for large rooms
✅ You want to mount it on your wall: If you want to save on floor space, you can mount it to your wall.
✅ You want something you can customize: You can customize the six filters, and for an extra $20 you can even choose an artistic front panel to help disguise it in your home.
❌ You don't want to spend a lot: This is one of the most expensive purifiers on this list.
❌ You want simplicity: It comes with an accompanying app, which we found to be tricky to use.
🔎 Rabbit Air MinusA2 Spa-780N: It may be one of the pricier air purifiers in this guide, but this stylish machine is well worth the money. The MinusA2 offers excellent performance, customizable filters, a robust filtration system and a handy smart app. ★★★★½
If you struggle with allergies and are looking for an inconspicuous air purifier to add to your home, then the Rabbit Air MinusA2 Spa-780N has a design that’s made for sleek, stylish homes.
Able to be wall-mounted or used as a portable purifier, this appliance is impressive on many counts. It has a standard coverage of 815 square feet, which is perfect for larger spaces, and a CADR capable of trapping pollen, dust and smoke in your designated space within that size. It’s crucial when shopping for an air purifier for allergies that you look out for a solid clean air delivery rate (CADR), and this air purifier claims to have high delivery rates with all of those allergens.
When it comes to selecting an air purifier for your home, there are a number of practical features to think about too. This Rabbit Air MinusA2 Spa-780N has been engineered to be ultra quiet, which is bound to be a top consideration for light sleepers. Having said this, we measured 48 decibels on turbo speed during our Rabbit Air MinusA2 Spa-780N review, so it's not quite as quiet as advertised.
The design of this air purifier means you probably won’t even notice that it’s there (especially with the wall mount option) but you’re bound to feel its benefit when it comes to air quality. In our tests, it removed between 84-90% of particles between 0.3 and 10 microns in size in just 30 minutes.
- Read our full Rabbit Air MinusA2 Spa-780N review
| Attributes | Notes |
|---|---|
| Design | Sleek and wall-mountable. |
| Performance | Not as quiet as they state. |
| Functionality | Can personalize filter type. |
Best air purifier for monitoring air quality
✅ You have a large space: It's best suited for large spaces, both in size and effective range.
✅ You want real-time air quality monitoring: This unit adjusts itself based on the air quality in your space.
❌ You're on a budget: Unless you specifically want real-time air quality monitoring, there are more affordable options out there.
❌ You want something quiet for your bedroom: We found it was quite loud on its highest setting, and it's better suited to larger rooms.
🔎 Coway Airmega 250: This air purifier boasts great air-cleaning performance, a handy air quality indicator and energy-savvy automatic modes — but it is relatively expensive. ★★★★½
The Coway Airmega 250 is a popular air purifier due to its high-end design and claims that it can capture 99.99% of fine airborne particles.
It has a three-stage filtration system, which makes it a good choice for allergy sufferers, and gives you helpful indications of when to change your filters, as well as filters that are in themselves easy to clean. It’s also thorough in its performance, with a capability of covering up to 930 square feet, one of the most impressive coverages we’ve seen.
Although it’s pretty pricey, the Coway Airmega 250 doesn’t have the smart-enabled features you might expect. Despite not being able to control this device via your phone, there are smart features though.
During our Coway Airmega 250 review, we liked that we could set the appliance on a Smart mode that adjusts the fan speed based on the air quality readings, easing the strain on energy bill. Rapid mode is a unique feature of the Coway Airmega 250, which we liked because it helps to quickly clear the air in cases when your air quality turns bad — for our tester, that often happens when she’s searing a steak. Rapid mode circulates the air at maximum power until the air is clean.
- Read our full Coway Airmega 250 review
| Attributes | Notes |
|---|---|
| Design | Easy to clean filters. |
| Performance | Has real-time air quality monitoring. |
| Functionality | Noisy on highest setting. |
Best air purifier for humidifier capabilities
✅ You want versatility: This 2-in-1 air purifier also doubles as a humidifier.
✅ You want smart features: It comes with a remote control and can be controlled via the Smart Life app.
❌ You don't want to spend loads: It's on the pricier side, so those with a smaller budget will want to look at other options.
❌ You don't have a lot of space: It's a fairly bulky unit, so it wouldn't be suitable for smaller spaces.
🔎 Turonic PH950 2-in-1: This stylish purifier-humidifier combo impresses with its user-friendly design, powerful air filtration system and efficient performance — but it is also quite bulky and pricey. ★★★★½
When it comes to air purifiers, Turonic may be a new kid on the block — but don’t let that put you off. The Turonic PH950 2-in-1 model may be a strong contender for the title of best mid-range air purifier.
Weighing in at almost 24 lbs, it's definitely not the lightest piece of equipment on the market. It is also bigger and wider than most competitors, so you may need to sacrifice some floor space. But taking into account what the Turonic PH950 can offer, this is not necessarily a deal breaker.
Indeed, the Turonic PH950 is a powerful 2-in-1 machine combining an air purifier and a humidifier. This complex piece of equipment is equipped with an ionizer, UV-C technology and several different filters designed to neutralize up to 99.98% of unwanted particles as small as 0.1 microns. It also comes with 10 different operating modes, a handy remote control, a designated app, a timer, PM2.5 laser air quality sensor, and a child lock — all for approximately $400 per unit. It may sound like a hefty price tag, but we found the Turonic PH950’s performance to be superb in our tests. And since this piece of equipment is highly energy efficient, it will not rack up your energy bills.
During our Turonic PH950 air purifier review, we found it easy to assemble and use. It is equipped with a stylish circular display and easy-to-understand color-coded indicators. The display is also suitable to use in a bedroom at night, as the icons are bright, but not flashy.
The downsides? For a relative beginner, the Turonic PH950 may seem like an overly complicated piece of machinery. Changing a filter in this piece of equipment can also prove quite costly — the price for a single filter pad tends to fall between $45 and $60.
- Read our full Turonic PH950 air purifier review
| Attributes | Notes |
|---|---|
| Design | Bulky design. |
| Performance | Works very efficiently and quickly. |
| Functionality | Doubles as a humidifier. |
Best air purifier for homes with pets
✅ You want smart features: It's easy to control with your voice or through the app.
✅ You have pets: It's designed specifically for homes with pets.
❌ You have a small space: It's not a small unit, so there are better options for those who are tight on space.
❌ You want to save money: There are cheaper Levoit models available.
🔎 Levoit Vital 200S: This smart air purifier harbors a real beast of performance — it is whisper-quiet, easy to use and efficient at removing airborne allergens. It comes with an app and dedicated pet mode, too. ★★★★½
Putting the Vital 200S through its paces during our Levoit Vital 200s review, we found it impressive and efficient at removing particles measuring as small as 0.3 microns. Pet dander, mold, dust and smoke were absorbed while chemicals and odors from everyday household cleaning and cooking were neutralized by the three-stage filtration system. This includes a washable pre-filter, an H13 True HEPA filter and a high-efficiency activated carbon filter.
While the large boxy design may not be suited to users who want a sleek and stylish air purifier, or those with small rooms, the no-frills aesthetic makes the Levoit Vital 200S the perfect choice for most users. While it’s not cheap, it is relatively affordable, and if you value clean indoor air quality, you won’t be disappointed with its performance.
The Levoit Vital 200S offers four fan speeds, three separate modes including pet, auto and sleep mode, and a connected app that allows you to control your air purifier remotely, wherever you are. It also works with Google Assistant and Alexa voice control devices.
The Vesync app is easy to use and allows users to track their real-time air quality data and historical data, revealing peaks in poor air quality over the day and taking the guesswork out of what’s causing bad air quality in your home.
- Read our full Levoit Vital 200S review
| Attributes | Notes |
|---|---|
| Design | A bit large for small spaces. |
| Performance | Designed specifically for homes with pets. |
| Functionality | App and voice control. |
Best air purifier for commercial spaces
✅ You have a large space: This air purifier is best suited to large, airy rooms or commercial spaces.
✅ You want smart features: It has app connectivity and smart features.
❌ You're on a budget: It's not a cheap unit, so anyone on a budget might want to consider more affordable options.
❌ You're short on space: It's quite a big unit, as expected, so you'll have to ensure there's room around it.
🔎 DH Lifelabs Sciaire + HEPA Air Purifier: Big and bold, this air purifier delivers a powerful air-cleaning performance without making much noise or requiring extensive maintenance. It is, however, on the expensive side. ★★★★
The Sciaire+ HEPA air purifier by DH Lifelabs is designed to maintain clean and germ-free living spaces efficiently. It utilizes 16 ion generators to bond with airborne particles actively, achieving a 99.99% elimination rate of bacteria and viruses. The 3-in-1 filter system, including pre-filter, HEPA filter, and activated carbon filter, effectively removes particles as small as 0.1 microns, addressing pet dander, pollen, dust, allergens, and volatile organic compounds (VOCs).
The purifier also features a dual air deodorization process, breaking down odors and neutralizing unpleasant smells. It covers areas up to 452 sq. ft., with Wi-Fi connectivity and app control. The design is big, though, measuring 35.4 inches in height and 13.6 inches in diameter. It may be too large for smaller homes. It performed well in our DH Lifelabs Sciaire + HEPA Air Purifier review and was super-quiet during operation, even on auto-mode.
With a 4.6 out of 5-star rating on Amazon, users enjoy how easy it is to use and how well it performs. However, they raise concerns about its size being more suited for commercial premises and the potential expense of filter replacements.
Due to its large size, we’d recommend the DH Lifelabs Sciaire+ HEPA Air Purifier for those with spacious homes or commercial spaces. Despite its substantial dimensions, it offers efficient air purification and ease of use, making it a suitable choice for the right environment.
- Read our full DH Lifelabs Sciaire + HEPA Air Purifier review
| Attributes | Notes |
|---|---|
| Design | Big, hefty unit. |
| Performance | Ideal for large rooms or commercial spaces. |
| Functionality | Smart features and app connectivity. |
Best air purifiers for allergies: Comparison
| Product | Rating | Pros ✅ | Cons ❌ |
|---|---|---|---|
| Levoit Core 600S | ★★★★½ | Exceptional performance, plenty of smart features, easy to use. | Bulky design. |
| GermGuardian AC4825E | ★★★★ | Great performance, compact, easy to use, affordable. | No smart features. |
| RabbitAir A3 | ★★★★ | Exceptional performance, plenty of smart features, unique design. | Relatively expensive. |
| Dyson Purifier Cool | ★★★★ | Great performance, plenty of smart features, sleek design. | Noisy and on the expensive side. |
| Rabbit Air MinusA2 Spa-780N | ★★★★½ | Exceptional performance, plenty of smart features, wall-mountable. | Relatively expensive. |
| Coway Airmega 250 | ★★★★½ | Exceptional performance, energy-savvy. | Relatively expensive, no smart features. |
| Turonic PH950 2-in-1 | ★★★★½ | Great performance, energy-savvy, sleek design. | Bulky and relatively expensive. |
| Levoit Vital 200S | ★★★★½ | Exceptional performance, pet mode, plenty of smart features. | Bulky. |
| DH Lifelabs Sciaire + | ★★★★ | Great performance, plenty of smart features. | Large and bulky. |
Our expert consultants
Wei-Ning Wang is an aerosols expert and associate professor at Virginia Commonwealth University. He is an editorial board member for several scientific journals, including Nanotechnology, KONA Powder and Particle Journal, Applied Sciences, Nanomaterials & Nanotechnology and is an advisory panel member for the Journal of Physics D.
Dr. Sameer Nakedar is a medical doctor and the chief medical officer at Welzo, a personalized healthcare service based in London, England. He is a portfolio general practitioner with a particular interest in promoting digital technology solutions in medical settings. Sameer has built several cross-platform applications used by primary and secondary healthcare providers worldwide.
Abbas Kanani is a qualified independent prescriber and a superintendent pharmacist at Chemist Click, an online pharmacy based in England. He is a member of Royal Pharmaceutical Society, National Pharmacy Association and General Pharmaceutical Council. As a consultant for the National Health Service, Abbas also provides advisory services on cost savings and clinical efficiencies.
Best air purifiers for allergies: Frequently Asked Questions
How can you maintain your air purifier for allergies?
Remember to keep your air purifier clean, and change your HEPA filter as recommended to ensure that it keeps running correctly. You can buy reusable filters that only require cleaning, but these do have a limited life expectancy and will still need to be completely replaced eventually.
Try to adhere to the room-size specifications that come with your air purifier for the most effective air cleaning possible. If placed in rooms with high foot traffic or rooms too large for their capacity, air purifiers will not clear the air of irritants as well as if they are used correctly. Don't forget to wipe down the outside of your machine with a dry or slightly damp cleaning cloth.
Do air purifiers help with allergies?
Air purifiers help reduce the number of allergens — particles that cause allergic reactions — circulating in the air indoors. Therefore, air purifiers may provide some relief to people with hay fever, especially when they are used alongside other mechanical barriers, such as masks and nasal filters, according to the American Academy of Allergy, Asthma & Immunology. However, it is unclear exactly how effective these machines are when used solely on their own. Air purifiers come with a variety of different filters and technological solutions, some of which may be more efficient at trapping airborne particles than others. In addition, people with hay fever tend to have different levels of sensitivity to allergens, thus making it difficult to make direct comparisons.
What is better for allergies: a humidifier or an air purifier?
Air purifiers help clean the air by trapping and removing fine airborne particles, including allergens like pollen, dust mites and pet dander. By reducing exposure to substances that cause allergic reactions, air purifiers may ease hay fever symptoms. Humidifiers, on the other hand, do not remove allergens or pollutants from the air, so they do not directly address the source of the allergies. However, they can still offer benefits for people with certain allergies.
More info
How to maintain your air purifier
Dr. Lee recommends keeping your home clean to reduce the burden on the air purifier. "Reduce environmental triggers by hoovering twice a week or more with a hoover with a HEPA filter." she advises. "Don’t smoke in the house or anywhere near the bedroom. Take your shoes off as soon as you come into the house to avoid treading allergens into the carpets and up the stairs. Keep the house clean by regularly washing the basins, baths and showers with an anti-mold cleaner."
Do air purifiers help with allergies?
Hay fever can be triggered by a wide range of airborne substances, but it’s predominantly caused by pollen, Dr. Sameer Nakedar, a medical doctor and chief medical officer at Welzo, a personalized healthcare provider based in London, England, told Live Science. ”The most common allergens that cause hay fever include tree, grass and weed pollen. Grass pollen is by far the most common, it affects up to 95% of sufferers,” he said. Mold spores and animal dander can also contribute to hay fever symptoms. “However, these allergens are not specific to hay fever, and they can trigger allergic reactions in some people all year round,” Nakedar said. Pollen, animal dander and other common indoor allergens are relatively large particles. According to the U.S. Environment Protection Agency (EPA), “some controversy exists about whether air cleaners can reduce the allergic reactions” produced by such sizable allergens. They don’t tend to linger in the air, but rather end up settling on surfaces in the home, such as cushions or carpets. Air purifiers may not be able to remove these allergens unless they are “disturbed and re-suspended in the air,” EPA said.
Complicating the situation, two individuals with the same allergy may have vastly different reactions to the same amount of allergens present in the air. Some people may experience mild symptoms, while others may have more severe or persistent issues, Nakedar said. As a result, it is likely that the same air purifier may have a different impact on hay fever symptoms, depending on one’s sensitivity to allergens.
Moreover, air purifiers are not created equal. They come in many shapes and sizes and with many different technological solutions. Therefore, some air purifier models may be better at easing allergic reactions than others. For example, machines equipped with HEPA filters may be more effective at reducing airborne allergens than air purifiers which use different filters. According to the EPA, High Efficiency Particulate Air Filters, commonly known as HEPA, have been shown to reduce at least 99.97% of dust, pollen, mold, and any other airborne allergens with a size of 0.3 microns (µm). At the same time, some HEPA filters are more complex than others, and it is likely that such differences in the design have an impact on their overall effectiveness.
Are air purifiers or humidifiers better for allergies?
Abbas Kanani, a superintendent pharmacist at Chemist Click, an online pharmacy, told Live Science:
“Dry air can exacerbate respiratory conditions and allergy symptoms, as it can irritate the nasal passages and throat,” he said. “Humidifiers work by adding moisture to the air to combat dryness. By increasing humidity levels, they can help alleviate dryness, soothe irritated airways, and provide relief for nasal congestion and dry coughs. A combination of both a humidifier and an air purifier may be beneficial in some cases, particularly during the winter months when indoor air tends to become dry due to heating,” Kanani said.
However, humidifiers may not be suitable for people with dust mites and mold allergies, according to the AAAAI. Mold spores tend to grow rapidly in places with excessive moisture, such as bathrooms, roofs or windows. Dust mites - microscopic, insect-like pests that feed off dead human skin cells - also thrive in humid environments. According to the EPA, humidity levels above 60 percent may vastly increase the number of these allergens in the environment, while levels between 30 and 50 appear to keep dust mites and mold spores at bay. Unfortunately, many humidifiers do not come with humidity meters and extensive moisture control settings, which makes it more difficult to adjust their output.
In addition, humidifiers themselves may add to the mold problem, AAAAI said. If the filters are not cleaned or changed on a regular basis, it can create a perfect environment for mold spores to grow within the unit. This in turn can lead to humidifiers blowing a vapor containing a high number of allergens. To prevent that from happening, the AAAAI recommends using distilled or demineralized water. Minerals found in tap water may increase the growth of pathogens and spores, as well as create white dust that can irritate the sinuses and contribute to allergy symptoms.
How to choose the best air purifier for you
While all air purifiers are designed to remove harmful particles from the air, not all models can be helpful with easing hay fever symptoms. Seemingly similar models may use different filters and offer vastly different technological solutions. This can make some air purifiers way more effective at removing specific airborne allergens than others. When choosing a model, look out for certain features. If your aim is to reduce allergens in your home, your best call is to pick an air purifier equipped with a HEPA filter, Nakedar told Live Science.
HEPA filters, short for "High Efficiency Particulate Air [Filter]", are mechanical air filters composed of a mesh of randomly placed fibers. According to the U.S. Environmental Protection Agency (EPA), HEPA filters have been shown to remove at least 99.97% of airborne allergens with a size of 0.3 microns (µm), including pollen and mold spores. It needs to be stressed, however, that most studies into HEPA filters were conducted in highly regulated laboratory conditions, and there are only a handful of studies that investigated the effectiveness of HEPA filters in reducing allergy symptoms in human subjects. Nevertheless, the results are promising. For example, a 2020 clinical trial published in the Yonsei Medical Journal found that patients with dust mite allergy may need fewer allergy medications following six weeks of exposure to air purifiers equipped with HEPA filters.
Moreover, certain air purifier models may actually exacerbate your allergy symptoms, rather than alleviate them, ACAAI said. For example, ionic electrostatic air purifiers work by releasing ions - molecules with an electric charge due to the loss or gain of one or more electrons - which then force harmful airborne particles to stick to walls and other household surfaces. Although this helps to clean the air from allergens, it does not remove them permanently. Moreover, ionic air purifiers are known to produce ozone, a gas molecule composed of three oxygen atoms, ACAAI warned. And according to the American Lung Association (ALA), ozone can irritate the airways and nasal passages, increasing the risk of respiratory problems and potentially aggravating hay fever symptoms. In addition, some ionic air purifiers come with additional UV light, which aims to kill bacteria and other harmful pathogens. However, there is no scientific evidence that this feature can be effective for alleviating allergic reactions, ACAAI said.
Another feature to look out for is the Clean Air Delivery Rate, or CADR, according to The American College of Allergy, Asthma & Immunology (ACAAI). The CADR value measures how fast a certain number of airborne particles can be trapped by an air purifier. Even the most technologically advanced air purifier may struggle with removing allergens if it’s not big or powerful enough to cover enough space. When picking your model, make sure its CADR matches the size of the room where you intend to use it, ACAAI recommends.
Lastly, choose an air purifier that comes with affordable replacement filters, Kanani told Live Science. Filters need regular changing to maintain the device's efficiency, which is particularly important during heavy pollen season, he said.
How we tested these air purifiers
How we test the best air purifiers for allergies
Every air purifier for allergies in this guide has been tested to the exact same standards, using the same processes. We created a series of tests to measure particles of different sizes, to see how each air purifier performs with certain types of impurities. We use a particle counter for all our testing, and our equipment is capable of measuring the smallest pollutants (0.3 microns) that can be removed from the air by a purifier.
We start by running an ambient air quality test, where we run the air purifier in multiple rooms in a home to see how it performs at the regular setting, and the highest possible setting (below 50 decibels). We make note of readings after 15 and 30 minutes to see the speed at which the machine removes particles from the air. We also measure the noise levels generated by the fan, to comment on how noticeable the purifier will be in an average home.
We then test different particle sizes using matches and incense to generate different types of smoke, taking measurements at regular intervals and on different speed settings.
Our testing also takes into account the size of the unit, the cost, ease of use, availability of additional parts, and the energy use on the lowest and highest settings. Finally, we check online user reviews to see what people think, and we test for any persistent problems or defects that we read about.
As per our testing policy, we fully disclose all our findings in our reviews.
