Here Are the 12 Best Air Purifiers of 2025 So You Can Breathe Easy

When you clean your house, you hit the usual suspects: bathroom, kitchen, bedding, carpets, and so on. But how often do you clean the air in your home? It’s not a pleasant thought, but the indoor air we breathe in some instances might be pretty dirty, says John McKeon, MD, CEO of Allergy Standards in Dublin. “People spend more than 90 percent of their time indoors, and indoor air can be 2 to 5 times more polluted than outdoor air,” he explains.

One easy solution is to use an air purifier, which helps clean indoor air by removing particles that contribute to symptoms of asthma and allergies, like coughing, headache, runny nose, itchy eyes, and congestion.

Although air purifiers can’t truly “clean” the air or make it 100 percent free of allergens, they can go a long way toward relieving symptoms associated with mold, dust, pet dander, pollen, smoke, and odors. But trying to understand the marketing lingo can make it frustrating to shop for one: HEPA, CADR, dB, activated carbon, air flow, and more. To help you find the best one for your needs, we researched more than three dozen popular air purifiers and consulted with experts. Here are the 12 air purifiers that made our list.

Our Top Picks for Best Air Purifiers

Best for Allergies

Honeywell AllergenPlus HEPA Air Purifier

$159.99 at Amazon

Pros

  • Filtration system removes allergens, odors, smoke
  • Cleans the air 5 times per hour
  • Affordable replacement filters

Cons

  • Works better in smaller spaces
  • Large, bulky design
  • Dimensions: 14"D x 13.5"W x 9"H
  • Coverage: 155 sq. ft.
  • Certifications: Energy Star
  • Noise level: 35dB
  • Special features: None
Air purifiers can help remove many common irritants and pollutants, but they need to meet certain criteria to truly be helpful in relieving allergy symptoms. Based on feedback from Christopher Brooks, MD, allergist and immunologist at The Ohio State University Wexner Medical Center in Columbus, we think the Honeywell AllergenPlus HEPA Air Purifier is a good choice for people with indoor allergies. A HEPA filter is a “high efficiency particulate air” filter and is designed to remove 99.7 percent of particles in the air.

“Many people with allergies have noses and sinuses that are very sensitive to smoke, fragrances, and indoor air pollution,” Dr. Brooks says, “[so] an air purifier that filters out extremely small particles may help decrease exposure to these triggers and lead to better symptom control.”

In other words, you need an air purifier that can remove smoke, odors, and air pollution just as well as pollen, pet dander, and mold. The AllergenPlus has a small enough filtration system to accomplish this, thanks to the HEPA filter. It works especially well when you place it in the right space: It can clean the air almost five times per hour in a medium-sized room (about 155 square feet). In fact, this is one of the most common threads among online reviewers — they love how well this air purifier improved their allergy symptoms in a short amount of time. The Honeywell has a clean air delivery rate (CADR) of 106 for dust; this number is determined by how quickly your purifier can clean the air of a particular allergen, with different rates for pollen, smoke, and dust.

 (For consistency, we’ll focus on the CADR for dust when comparing air purifiers.)
You do have to keep in mind the unit’s recommended square footage. If you place it in a larger room, you’ll get less air exchange per hour. It’s also a bit large, considering the intended square footage, so it probably needs floor space, and it’s not the quietest device on our list. At 35 decibels (dB), it’s above “whisper quiet” (which is typically around 30 dB), and could potentially disrupt your sleep if you’re using it in a bedroom.

Best for Asthma

CleanForce Rainbow Series Purifier

$349.99 at Amazon

Pros

  • Certified safe for people with allergies, asthma
  • Large square foot coverage
  • Extra antimicrobial protection for germs

Cons

  • Quiet on low, but louder on higher settings
  • Some users question motor durability over time
  • Dimensions: 11"D x 11"W x 25.5"H
  • Coverage: 2,550 sq. ft.
  • Certifications: Energy Star, AHAM Verifide, Asthma & Allergy Friendly
  • Noise level: 29dB
  • Special features: App and voice control
Air purifiers can be beneficial for people with asthma, but it’s important to choose carefully since some devices can generate a gas called ozone, which can be irritating to people with respiratory problems. If you have asthma, we recommend buying an air purifier that has been approved by the Asthma and Allergy Foundation of America (AAFA), like the CleanForce Rainbow Series Purifier.

Through its Asthma & Allergy Friendly Certification Program, the AAFA tests air purifiers according to their safety standards and only recommends devices shown to be safe for people with asthma and allergies. Because the CleanForce purifier is on their certified list, Michelle Yasharpour, MD, an allergist and immunologist in Beverly Hills, California, recommends it, pointing out that it has an AAFA-certified air filter and an activated carbon filter, too, to help capture more airborne allergens. Dr. Yasharpour also likes that it has a sleek design and quiet operation, plus works well in larger spaces, covering up to 2,550 square feet per hour while giving real time updates on air quality levels.

There are a few other things we appreciate about the CleanForce, like the fact that its filters are made with antimicrobial materials to help further reduce viruses and bacteria and its smart features, like remote setting adjustments through an app and voice control with Google. It also has a CADR of 330 for dust. However, it’s important to note that online reviewers often dislike the noise level when this purifier is set to higher speeds, and some share concerns about the ability of the motor to run smoothly with consistent use.

Best for Pet Dander

Rabbit Air A3 Ultra Quiet Air Purifier With Pet Allergy Filter

$749.95 at Amazon

Pros

  • Custom filter designed to trap pet hair, dander
  • Slim, streamlined design
  • Multiple levels of filtration
  • Can be wall mounted

Cons

  • More expensive than other purifiers on this list
  • Touchscreen interface can be finicky
  • Multiple filters to replace with added cost
  • Dimensions: 20”H x 19”W x 8”D
  • Coverage: 1,070 sq. ft.
  • Certifications: Energy Star, Asthma & Allergy Friendly
  • Noise level: 20dB
  • Special features: App and voice control; wall mount

Even if you’re not allergic to pet dander, many pet owners choose to run an air purifier at home to help reduce the amount of pet allergens (and odors!) in the air. Most air purifiers do a good job at removing pet dander from the air, but the Rabbit Air A3 Ultra Quiet Air Purifier With Pet Allergy Filter goes one step further: It includes an additional filter specifically designed just to trap pet hair and dander. This is in addition to a pre-filter, HEPA filter, and activated carbon filter.

We also suggest this purifier for pet owners because of its unique design: With a tall, slim shape, you can push it up against a wall or even mount it on a wall to keep it out of the way of pets and give you more floor space. It comes with an app for extra convenience in controlling your device, and it’s quieter than many other purifiers. Because it has received the AAFA’s Asthma & Allergy Friendly Certification, it’s recommended by Dr. McKeon as a reliable option for your home. It has a CADR of 262 for dust.

The main flaw we see with the A3 is the touchscreen interface: It’s discreet, but that also makes it tricky to use. The buttons are hard to see, especially when it goes into power-saving mode, and aren’t as easy to press as mechanical buttons.

Best Purifier and Fan

Dyson Purifier Cool Gen1 TP10

$362 at Amazon

Pros

  • Dual functioning fan and purifier
  • Modern, minimalist design
  • Easy to clean, maintain

Cons

  • Doesn’t specify square footage
  • No special features or secondary filters
  • Dimensions: 8.5"D x 8.55"W x 41"H
  • Coverage: not specified
  • Certifications: Energy Star
  • Noise level: 42dB (on medium)
  • Special features: None

If you’re looking for cleaner air and good airflow, you don’t have to buy two separate devices. The Dyson Purifier Cool Gen1 TP10 is a fan that keeps you cool while trapping common irritants like dust, pet dander, and pollen.

With a combination HEPA and carbon filter, the Dyson can keep a room clean, removing up to 99.97 percent of particles (0.3 microns in size). There are 10 speeds to choose from and gentle oscillation that distributes air evenly around to every corner. We also like its sleek, open design that can fit seamlessly into any living or working space and makes cleaning the outside of the purifier with a clean cloth simple and time-saving. The inside is minimalist as well, with only one filter to clean and replace. However, while Dyson says the Cool Gen1 can “clean a whole room,” it doesn’t specify the square footage it covers, and it doesn’t include any CADR specifications. It’s also fairly no-frills, with no additional filters or techie features like app control.

Best for Large Spaces

Levoit Core 600S Air Purifier

$299.99 at Amazon

Pros

  • Cleans 3,000-plus sq. ft. of air in 1 hour
  • App, voice-control smart features
  • Sleep mode for extra-quiet operation

Cons

  • App function can be clunky
  • Some users complain about auto sensor reliability
  • Dimensions: 12"D x 12"W x 24"H
  • Coverage: 3,175 sq. ft.
  • Certifications: Energy Star
  • Noise level: 26dB (on sleep mode)
  • Special features: App and voice control

Anyone looking for an air purifier that can clean the air in a large living or working space should consider the Levoit Core 600S Air Purifier. It’s capable of exchanging a massive amount of air in just one hour (up to 3,175 square feet) and includes a “sleep mode,” allowing it to run as quietly as 26 dB while still functioning efficiently.

Dass says the Core 600S’s ability to filter particles down to 0.3 microns and its smart connectivity (to an app and Google) as standout features, and we agree — we like that you can get a read on exactly how well this device is working by checking the app to view your current air quality, program the purifier to turn on and off at different times (or run automatically), and look up how much longer your filter is expected to last before it needs to be replaced.

That said, with an app often comes additional technological difficulties, and some online reviewers of the Core 600S complain that the app function simply isn’t as useful or intuitive as it could be, and that sometimes the automatic sensing feature of the purifier doesn’t work consistently or reliably. Levoit indicates the 600S has an average CADR of 410 for dust, smoke, and pollen.

Best Smart

Coway Airmega 400S Smart Air Purifier

$354.99 at Amazon
$469Now 24% Off

Pros

  • Coway-branded app for smart control
  • Filters allergens
  • Multiple ways to get a real-time air quality reading

Cons

  • More expensive than some other purifiers on this list
  • App can be finicky, especially for Android users
  • Dimensions: 15"D x 15"W x 23"H
  • Coverage: 3,120 sq. ft.
  • Certifications: Energy Star
  • Noise level: 22dB (on low)
  • Special features: App and voice control; activated carbon filter

The Coway Airmega 400S Smart Air Purifier is similar in size and square footage capabilities to the Levoit Core 600S featured on our list, and the two products are nearly interchangeable as far as their functionality in cleaning large rooms with smart technology. What sets the Airmega aside from the Core 600S in terms of smart features, though, is that it uses its own app to help you manage and control your air purifier’s settings.

Where the Levoit taps into an app that can be used for multiple brands of air purifiers, the Coway app is made only for Coway air purifiers, giving you more niche options and customized air-quality reports. Using the app, you can monitor and track your indoor air quality, schedule run times, get outdoor air quality alerts for major environmental changes in your local area, and update speed and mode settings even when you’re away from home. It has a CADR of 328 for dust.

The Airmega also gets praise from Dass, who notes that it covers a large room size (3,120 square feet) and filters particles as small as 0.01 microns, meaning it can filter out more allergens (99.999 percent) than many of its competitors. We also like the LED indicator that gives you in-the-moment readings of your air quality. The only downsides we can find to the Airmega are its cost, which is higher than several of the other purifiers on our list, and the fact that some users with Android smart devices have trouble getting the app to link to their devices, requiring work-arounds or assistance from technical support.

Best for Small Rooms

Blueair Mini Max Air Purifier

$79.95 at Amazon

Pros

  • Effective even in medium-sized rooms
  • Three methods of filtration
  • Fits almost anywhere

Cons

  • Quiet on low, but louder on higher settings
  • Pre-filter may need to be washed frequently
  • Dimensions: 7"D x 7"W x 11"H
  • Coverage: 223 sq. ft.
  • Certifications: Energy Star, AHAM Verifide
  • Noise level: 20dB (on low)
  • Special features: None

If you need to purify the air in a small space, like a work cubicle, bathroom, entryway, or closet, you don’t need a bulky or expensive device. You can use one better suited to an area with less square footage, like the Blueair Mini Max Air Purifier. Kathleen Dass, MD, allergist and immunologist based in Oak Park, Michigan, says this is a small and quiet device that still manages to effectively filter out particles down to 0.1 microns in a reasonably sized space.

We agree: We liked how the Blueair packs a big purifying punch into a device that’s less than 7 inches in diameter and under 12 inches tall. It can fit on a desk, nightstand, side table, or bookshelf with ease, all while trapping dust, pollen, pet dander, smoke, and odors in its triple-filtration system that includes a removable, washable pre-filter, a HEPA filter, and an activated carbon filter. On the low setting, you’ll barely be able to hear this air purifier, though the noise level does increase with higher speeds.

One note about the pre-filter: It covers the bottom outer half of the device, which means you may need to frequently remove it and wash it if you want it to continue working effectively. And because it’s small, it’s CADR for dust is just 60.

Best With Humidifier

Sharp Air Purifier and Humidifier With Plasmacluster Ion Technology

$246.89 at Amazon
$277.13Now 11% Off

Pros

  • Streamlined design combines 2 devices in 1
  • 3 separate filters for trapping airborne particles
  • Long-lasting filters

Cons

  • Ion technology isn’t ideal for users with asthma
  • It may be too noisy for some people
  • Dimensions: 10.5”D x 23”H x 15”W
  • Coverage: 1,230 sq. ft.
  • Certifications: Energy Star, AHAM Verifide
  • Noise level: 19dB (on low)
  • Special features: Humidifying filter and activated carbon filter; ionizing technology

If you’re worried about the quality of your indoor air and how it relates to your health, you may want to think about a combination air purifier and humidifier like the Sharp Air Purifier and Humidifier With Plasmacluster Ion Technology. Not only does it keep your indoor space at a comfortable humidity level — using moisture sensors to detect changes automatically — it’s also able to efficiently clean medium-sized rooms with its trio of filters: a HEPA filter that captures 99.97 percent of air particles, a carbon filter for reducing odors, and a pre-filter screen that traps larger particles like dust and pollen. It has a CADR of 164 for dust.

This particular Sharp device also includes a feature called “Plasmacluster Ion Technology,” which they claim attracts irritants in the air and draws them into the machine. It’s worth noting that while ion-generating purifiers can help remove small particles in the air, there are currently no studies that show they can remove larger particles like dust or allergens.

 Ionized air can also be irritating to people with asthma, so it might not be a good fit for everyone. Some online reviewers also complain that the unit makes a ticking noise when in ionizing mode, which could disrupt your sleep depending on where you’re using it.

Best for Germs

GermGuardian Air Purifier With HEPA 13 Filter

$99.99 at Amazon

Pros

  • UV sanitizing light reduces viruses, bacteria
  • Triple filters to capture particles of many sizes
  • Affordable replacement filters

Cons

  • May be too noisy for some people
  • Not the sturdiest or most solid option
  • Dimensions: 11"D x 7"W x 22"H
  • Coverage: 743 sq. ft.
  • Certifications: Energy Star
  • Noise level: 40dB (on low)
  • Special features: UV sanitizing light; activated carbon filter
According to Yasharpour, not all air purifiers are capable of trapping and removing infectious airborne particles — they need to have certain extra features to neutralize viruses and bacteria, like UV sanitization technology. If you want a purifier that can serve as a useful tool in your fight against common illnesses, you’ll need to choose something like the GermGuardian Air Purifier With HEPA 13 Filter. It goes one extra step in reducing germs in the air by including a UV sanitizing light, which can kill several types of viruses, including influenza and coronaviruses, as well as many bacteria, like certain strains of Staphylococcus.

Even as a standard air purifier, without the focus on germs, we like many of the features of the GermGuardian: The HEPA filter takes care of particles like pollen and mold, the activated carbon filter assists with eliminating odors, and the pre-filter traps larger particles, like pet hair and dust mites. It has a CADR of 118 for dust. We also appreciate that replacement filters are sold in multipacks, making them relatively affordable, especially compared to other devices. That said, the Germ Guardian is somewhat louder than other purifiers, even on its lowest setting, and some online reviewers feel it could have a sturdier construction and better quality control.

Best for Wildfire Smoke

Medify MA-25 Air Purifier With True HEPA H13 Filter

$148.99 at Amazon

Pros

  • Noticeably reduces smoke, odors
  • Triple filters to capture particles as small as 0.1 microns
  • Small but powerful

Cons

  • Multiple filters means higher maintenance costs
  • Quiet on low, but louder on higher settings
  • Dimensions: 8"D x 8"W x 13.5"H
  • Coverage: 825 sq. ft.
  • Certifications: Energy Star, AHAM Verifide
  • Noise level: 20dB on low
  • Special features: Activated carbon filter

When an area is affected by wildfire smoke, experts usually recommend that people stay indoors as much as possible, especially if they have respiratory conditions like asthma or chronic obstructive pulmonary disease (COPD). But your indoor air can be affected by wildfire smoke, too, so it can help to run an air purifier capable of efficiently filtering smoke like the Medify MA-25 Air Purifier With True HEPA H13 Filter.

“As more and more people battle wildfire smoke, having an air purifier or getting new filters [for an existing purifier] can help,” says Dass. “If you have a HEPA filter, it should be able to filter out particles smaller than 10 microns and should also have filters that can remove the volatile organic compounds (VOCs) from wildfire smoke, like benzene.” VOCs are chemicals that are present in common home products (carpet, vinyl flooring) and building materials, like paint and varnishes; these products “off-gas,” or emit VOCs into your home.

When burned, these chemicals are released into the air.

The Medify has the filtration rate Dass says is required for wildfire smoke: 99.9 percent, trapping particles as small as 0.1 microns, which makes it effective at cleaning your air of everything from VOCs and dust to pet hair and, yes, wildfire smoke. It has an average CADR of 187 for dust, pollen, and smoke. It’s sleek and relatively small, with a glass touchscreen interface, but powerful enough to work in a medium-sized room, cleaning the air in a 400-square-foot space twice in one hour (or once in an 800-square-foot room). It’s worth noting, though, that while this device runs quietly on low speed, it will become much louder on medium and high, so that might be a concern depending on where you’re using it. And with more than one filter to replace, the maintenance costs can also get fairly high.

Best for Odor Control

Rabbit Air MinusA2 Ultra Quiet Air Purifier With Odor Remover

$599.95 at Amazon

Pros

  • Custom filter designed to trap stubborn odors
  • Slim, streamlined design
  • Can be wall mounted or placed on floor

Cons

  • More expensive than some other purifiers on this list
  • Multiple filters to replace (at added cost)
  • Dimensions: 7"D x 21"W x 20"H
  • Coverage: 815 sq. ft.
  • Certifications: Energy Star, Asthma & Allergy Friendly
  • Noise level: 25dB
  • Special features: Remote control; wall mount

All purifiers can help remove odors to a certain extent, but we like that the Rabbit Air MinusA2 Ultra Quiet Air Purifier puts deodorization at the forefront of its operation with a customized filter designed to trap odors from cigarette and cigar smoke, cooking, pets, and mildew.

The customized filter is in addition to several other filters (including a HEPA, pre-filter, and activated charcoal filter), making the MinusA2 more efficient than the average purifier at truly getting rid of all stinky smells in your space. We also like that it’s powerful enough to handle 815 square feet, but thin and streamlined enough to be mounted on the wall, if you choose. It has a sleek and modern appearance that’s eye-catching, but also the filtration power to handle nearly any odors you send its way. Its CADR for dust is 193.

Like many other Rabbit Air purifiers, it’s more expensive than some of its competitors, though it may be worth your investment if you’re looking for something easy to clean and maintain that works overtime as far as deodorization. Be aware, too, that multiple filters means multiple filter replacements (and higher maintenance costs overall).

Best For Dust and Mold

LG PuriCare 360 With NanoFiber True HEPA

$299.99 at Amazon

Pros

  • 360-degree design purifies more air
  • Optional custom filters
  • Can clean a 2,000-plus sq. ft. room in 1 hour

Cons

  • Not Energy Star rated
  • Needs space to operate properly
  • Dimensions: 12"D x 12"W x 20"H
  • Coverage: 2,059 sq. ft.
  • Certifications: Asthma & Allergy Friendly
  • Noise level: 23dB
  • Special features: App control

According to Yasharpour, most people think air purifiers also help with dust mite allergies as well, but dust mites are a heavy allergen that sinks to the floor and usually needs to be vacuumed with a HEPA-certified vacuum cleaner, she explains. We’re not saying the LG PuriCare 360 With NanoFiber True HEPA has special dust mite-fighting properties, but we are saying its unique 360-degree design allows it to clean more of the air in your space, including the floor and other areas low to the ground.

This gives it a little more filtration capabilities than some other styles of air purifiers, but it also means you’ll need to keep it out in the open rather than pushing it against a wall. In addition to this whole-room air-cleaning ability, the PuriCare 360 has plenty of other reasons to be effective against dust and mold: Its sensor detects super-small particles and traps around 99.97 percent of them, can exchange the air in a 2,000-plus square-foot room in just one hour, and offers consumers the option to add customized filters to the base HEPA filter, including ones designed to trap more pet hair or more odors.

It’s also noteworthy that the PuriCare 360 has an Asthma & Allergy-Friendly Certification and is another model recommended by McKeon. It has an average CADR of 277 for smoke, pollen, and dust, but doesn’t appear to have an Energy Star rating.

Comparison Table

Best for
Highlights
Allergies
  • Multiple air exchanges per hour
  • Easy and affordable filter replacement
  • Removes 99.97% of particles
Asthma
  • Certified safe for people with asthma
  • Extra microbial protection
  • Smart features
Pet dander
  • Includes custom pet dander filter
  • Can be wall mounted
  • Streamlined, stylish design
Purifier and fan
  • Minimalist design
  • 10 fan speeds
  • Easy-to-replace filters
Small rooms
  • Fits on counters and tables
  • Triple filtration system
  • Whisper quiet on low
Large spaces
  • 3,000-plus sq. ft. coverage
  • Sleep mode
  • Smart features
Smart
  • Custom app
  • Filters 99.999% of allergens
  • Real-time air quality readings
Humidifier
  • Long-lasting filters
  • Streamlined design
  • Ionizing technology
Germs
  • UV sanitizing for maximum removal of viruses, bacteria
  • Affordable filters
  • Triple filtration system
Smoke
  • Compact, powerful
  • Filters down to 0.1 microns
  • Controls smoke and odors
Control
  • Designated odor control filter
  • Can be wall mounted
  • Streamlined, stylish design
Dust and mold
  • Optional custom filters
  • 360-degree design reaches floor
  • 2,000-plus sq. ft. coverage

How We Chose the Best Air Purifiers

We selected air purifiers for this list by researching how they work and what features they need to include in order to effectively clean indoor air. Then we considered factors like brand trustworthiness, room coverage, effectiveness ratings, and any other notable features, like smart app compatibility and certification by groups like the Asthma and Allergy Foundation of America (AAFA) or U.S. Environmental Protection Agency (EPA). We also searched only for air purifiers with a HEPA (high-efficiency particulate air) filter, which removes the highest amount of airborne particles that can cause irritation to your lungs, like dust, mold, and pollen.

As we narrowed down our favorite products, we also asked experts to share what they recommend looking for in an air purifier and help us choose the products that would serve a wide variety of people with different living spaces, budgets, and health needs.

  • John McKeon, MD, CEO of indoor air certification company Allergy Standards Limited in Dublin
  • Christopher Brooks, MD, allergist and immunologist at The Ohio State University Wexner Medical Center in Columbus
  • Michelle Yasharpour, MD, an allergist and immunologist in Beverly Hills, California
  • Kathleen Dass, MD, allergist and immunologist based in Oak Park, Michigan

What to Look for When Buying Air Purifiers

If you’re not an allergist, immunologist, or air quality expert, it can be challenging to understand what all the features of an air purifier do and why they’re important. Because some features may be more important to you than others based on your health and lifestyle, it helps to know what the numbers, ratings, and recommendations used in the marketing of an air purifier actually mean before you purchase.

  • Effectiveness You want an air purifier that effectively cleans the air, but how is this actually determined? Typically, with two metrics: the clean air delivery rate (CADR) and the air changes per hour (ACH). The CADR refers to how much filtered air a purifier can produce, while the ACH is calculated based on how quickly a purifier can clean and exchange the air in a room.

     Both are ways to measure how well an air purifier will work in a designated space.
  • Room Size Before choosing an air purifier, figure out the square footage of the space where you plan to use it. McKeon says this is an important step, because an undersized unit won't effectively clean the air in a large space. He recommends checking the manufacturer's recommendations for room coverage and using the purifier’s CADR rating as a guide to finding the size that’s right for you.
  • Filters A true HEPA filter is the best possible way to ensure the effectiveness of any air purifier, but some products may have additional filters as well, like an activated carbon filter. McKeon says these filters are typically used for removing odors and gases, and can be especially effective in areas affected by heavy pollution or wildfires when combined with a HEPA filter.
  • Smart Features How “smart” an air purifier is has no impact on its overall effectiveness, but features like app or voice control and automatic sensors to detect when the air needs to be cleaned increase the usefulness of your device. Keep in mind, though, that you should have access to and be comfortable with using smart technology if you want to make the most out of these features; otherwise, you may end up spending more for features you don’t use.
  • Energy Efficiency Depending on how often you plan to run your air purifier, you may want to look for one that meets the energy efficiency guidelines set by the EPA. If it does, it will likely have an Energy Star certification label on the packaging; this can help you save money and energy if you’re running your purifier frequently.

  • Maintenance Air purifiers are usually easier to maintain than humidifiers because they don’t include a water tank. But you will at least have to wipe the outside of your purifier with a clean cloth every few weeks and be diligent about cleaning or replacing your filters according to the manufacturer’s instructions (usually every 6 to 12 months). A dirty filter will prevent your purifier from working properly. If your purifier requires filter replacements one to two times per year, this is an added expense you may want to factor into your budget for an air purifier; typically, more expensive devices have more expensive replacement filters.
  • Noise Level Most people want to keep their air purifiers running often, including while they sleep, so consider how much noise you can tolerate. Air purifiers aren’t usually silent, but you may need one that runs more quietly if you’re planning to use it in a bedroom, infant nursery, or office, says McKeon.

What Are the Health Benefits of Using an Air Purifier?

According to McKeon, indoor air can contain pollutants in the form of particulate matter, or particles, ranging in size from coarse to ultrafine. These pollutants, he adds, are usually things like animal dander, pollen, mold, dust mites, and fumes released by cooking, burning fuel, or cleaning products.

Air purifiers can’t remove every pollutant in your air, but they can often clean as much as 99.97 percent of them. Nonionizing air purifiers can be especially beneficial to children, elderly adults, people with respiratory conditions like asthma and allergies, people with cardiovascular diseases, and people who are pregnant, McKeon says.

A study published in 2015 found that air purifiers can improve the health of all people, but especially those with certain chronic conditions, like asthma and cardiovascular disease.

Do I Need a HEPA Filter in My Air Purifier ?

Yes, you should choose an air purifier with a HEPA filter, says Dr. Brooks; in fact, this is the most important part of an air purifier, since this is what will allow your device to capture and remove the very small allergens in the air that can cause symptoms.

Many of these allergens are 0.3 microns, a size that is easily able to penetrate other types of non-HEPA filters. Most HEPA filters can capture and remove as many as 99.97 percent of airborne particles this size, making them highly effective at filtering out allergens.

What Does ‘CADR’ Mean and Why Does It Matter?

CADR stands for clean air delivery rate, and it’s a measurement of how much filtered air your purifier can produce.

“The CADR is a critical metric, which indicates the volume of filtered air an air cleaner delivers, with separate scores for smoke, pollen, and dust,” says McKeon, adding that a higher CADR means the device can filter more particles and more effectively purify a larger space.

If you want to make sure your chosen air purifier can deliver the amount of filtered air it claims, look for an AHAM Verifide label or designation on the package. The Association of Home Appliance Manufacturers (AHAM) is a third-party organization that tests the performance of air purifiers, giving their certification to devices that meet their guidelines.

In general, AHAM recommends that the CADR of an air purifier be equal to two-thirds of the square footage of the room you’ll be using it in; for example, a room that’s 600 square feet in size should have an air purifier with a CADR of at least 400, though this may need to be higher if you’re trying to remove certain pollutants, like smoke.

Are Electronically Charged, Ionizing, or UV Sanitizing Air Purifiers Safe?

For the most part, Brooks says these types of air purifiers are safe for everyone to use. However, electronically charged and ionizing air purifiers can generate a gas called ozone, which can be irritating to some people (like those with asthma).

“Ozone can be very harmful to health, particularly for those with respiratory conditions,” says Dr. McKeon, “[so] avoid air purifiers that emit quantities of ozone above [the recommended] threshold of 50 parts per billion (ppb).” This is supported by the U.S. Food and Drug Administration (FDA), which has set an ozone limit of 50 ppb for indoor medical devices.

This is part of the reason why McKeon personally recommends air purifiers that have received an Asthma & Allergy Friendly Certification, which means they’ve been assessed for ozone emissions and found to be safe for all users.

As for UV sanitizing lights typically included with air purifiers designed to remove germs, Dass says these are also generally safe for everyone to use because the UV light is meant to be contained within the unit; that said, it’s important to use these air purifiers correctly, according to the manufacturer’s instructions, and avoid exposing your eyes or skin to the light source.

FAQs

How do air purifiers work?
Air purifiers are designed with a filtration system to capture and remove problematic airborne particles, like pollutants and allergens. Usually, this system includes a HEPA filter, but it might also involve a fan or other types of filters, like activated carbon or ionizing filters, to remove an even higher amount of particles from the air.
According to Dass, most air purifiers can help with mold allergens, but won’t remove mold or mildew that is already in the home. Mold spores are usually between 1 and 5 microns in size, she adds, putting them well within the range of what a HEPA filter can remove. Air purifiers don’t remove germs solely by filtering and cleaning the air, says Yasharpour, so you shouldn’t assume your device is eliminating germs unless it has special features designed to, such as a UV sanitizing light

Many air purifiers are beneficial to people who experience indoor or seasonal allergies. Brooks says they can improve allergy symptoms by decreasing the amount of allergens in the air — per the American College of Allergy, Asthma, and Immunology — especially for people allergic to pollen, mold, and pet dander.

This also depends on the capabilities of your air purifier and the square footage of your space. In general, though, air purifiers properly matched to the size of your room or indoor space start working fairly quickly to clean the air — anywhere from just a few minutes to an hour or two.

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Sarah Bradley

Author

Sarah Bradley is a freelance writer who has been creating online health content since 2017. Her work has included personal essays about parenting and homeschooling, as well as reported features on pregnancy, women's health, and child health. She's also worked as a commerce writer who has reviewed a wide range of health products, including toothbrushes, mattresses, and pacifiers.

As someone who looks for trustworthy internet advice when trying to solve her own health problems or resolve family dilemmas, Sarah takes her job researching and writing reliable health and parenting content seriously. Her goal is always to present accurate information in a friendly, easy-to-understand way.

Her work has been featured in Women's Health, Verywell Health, The Bump, O, the Oprah Magazine, BabyCenter, and Parents, among others.

She currently lives in Connecticut with her husband and three sons.

jon-stahlman-bio

Jon E. Stahlman, MD

Medical Reviewer

Jon E. Stahlman, MD, has been a practicing allergist for more than 25 years. He is currently the section chief of allergy and immunology at Children’s Healthcare of Atlanta's Scottish Rite campus and the senior physician at The Allergy & Asthma Center in Atlanta. He served as the president of the Georgia Allergy Society, has been named a Castle Connolly Top Doctor, and was listed as a Top Doctor by Atlanta magazine. His research interests include new therapies for asthma and allergic rhinitis as well as the use of computerized monitoring of lung function.

He received his bachelor's and medical degrees from Emory University. He completed his pediatric residency at Boston Children’s Hospital and his fellowship in allergy and clinical immunology at Harvard University’s Boston Children’s Hospital and Brigham and Women’s Hospital. After his training, Dr. Stahlman conducted two years of clinical research at Boston Children’s Hospital and was part of the faculty at Harvard Medical School, where he taught medical students and allergy and immunology fellows.

Stahlman is board-certified and recertified in allergy and clinical immunology. He served as a principal investigator on phase 2 through 4 studies that are responsible for most of the U.S. Food and Drug Administration–approved therapies for allergies and asthma available today.

Outside of the office, he centers his interests around his wife and three daughters, coaching soccer for many years, and his hobbies include cycling and triathlons.

EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
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