Deeper Dive: Our Top Tested Picks
- Numerous air quality readings
- Quiet operation
- Powerful cooling fan
- Long filter life
- Supports app and voice control
Meant for rooms up to 1,076 square feet, the Dyson Big+Quiet Formaldehyde BP03 uses a three-stage HEPA filtration technology to rid the air of harmful pollutants such as formaldehyde, nitrogen dioxide (NO2), carbon dioxide, and other volatile organic compounds (VOCs). It’s one of the most efficient air purifiers we have tested, and its filters will last up to five years before needing replacement. We also appreciate its detailed air quality reports, which let you closely monitor indoor pollution levels.
If you need an air purifier that quickly and quietly purifies the air in large rooms, the Dyson Big+Quiet Formaldehyde BP03 is a top choice. With support for Alexa, Google, and Siri voice commands, it’s an excellent addition to any smart home.
Recommended Room Size
1,076 square feet
Purification Method
HEPA, Activated Carbon, Composite Catalyst
Cost of Replacement Filters
$169.99 for HEPA, $89.99 for Activated Carbon
Voice Control Support
Amazon Alexa, Google Assistant, Siri
Learn More
Dyson Big+Quiet Formaldehyde BP03 Review
- Heats, cools, and purifies
- Numerous air quality readings
- 350-degree oscillation
- Supports voice control
- Expensive
- Loud at high fan speeds
Dyson makes some of our favorite air purifiers, and the Hot+Cool Formaldehyde HP09 is one of its most versatile models. It’s not only a highly capable air purifier but also a fan and a space heater with 350 degrees of oscillation. In addition to the usual airborne pollutants, this model captures formaldehyde (HCHO), a colorless chemical emitted by cleaners, plywood, varnishes, and many other common household items and materials.
If you need a space heater to warm up, this one blows fresh, purified air. Since it doubles as a fan, it’s an excellent choice if you need both heating and cooling. This is also a compelling option if you are undergoing a renovation, as common building materials like plywood and particleboard, as well as new furniture and rugs, can emit formaldehyde.
Purification Method
HEPA
Cost of Replacement Filters
$79.99
Voice Control Support
Amazon Alexa, Google Assistant, Siri
Learn More
Dyson Hot+Cool Formaldehyde HP09 Review
- 360-degree HEPA filter made of recycled material
- Large, oscillating fan
- Entire machine is fully sealed to HEPA H13 standard
- Supports app and voice control, scheduling
- Magnetized remote can be stored on top of the machine
- Small, lightweight design
- Easy to set up and use
The Dyson Purifier Cool TP07 is among our top picks for good reason. In addition to doing a great job of cleaning the air in our tests, it offers numerous air quality measurements, voice control support, and a fully sealed HEPA 13 enclosure. It even integrates a sleek oscillating fan that keeps you cool.
If you want a top-of-the-line, smart air purifier and fan combo, look no further than the Dyson Purifier Cool TP07. The Big+Quiet delivers more powerful air purification, but the TP07’s tower design makes it a better choice for staying cool.
Recommended Room Size
N/A
Purification Method
HEPA, Activated Carbon
Cost of Replacement Filters
$79.99
Voice Control Support
Amazon Alexa, Google Assistant, Siri Shortcuts
Learn More
Dyson Purifier Cool TP07 Review
- Six-stage filtration
- Multiple design and filter options
- Quiet operation
- Useful companion app
- Alexa voice control
- Expensive
- Does not support Google Assistant, IFTTT, or HomeKit
The Rabbit Air A3 Air Purifier is pricey, but worth the money for its excellent purification performance and ample customization options. You can hang it on a wall or place it on the floor, and it offers a choice of several specialty filter options, mood lighting colors, and eye-catching prints for the front panel. Moreover, it can cover a very large area, with a recommended room size of up to 1,070 square feet.
If you want an air purifier that isn’t an eyesore and/or one with a wall-mountable design, the A3 is our top pick. Given its wide coverage area, the A3 is especially well-suited for large homes.
Recommended Room Size
1,070 square feet
Purification Method
HEPA, Activated Carbon, Ionic
Cost of Replacement Filters
$115.95
Voice Control Support
Amazon Alexa
Learn More
Rabbit Air A3 Air Purifier Review
- Wide coverage area
- Fast cleaning action
- Supports voice controls
- Large footprint
- Limited air quality measurement capabilities
- Loud fan
Featuring a HEPA carbon-activated filter, the Coway Airmega 250S impressed us with its ability to quickly rid the air of pollutants in our cleaning tests. We like the support for Alexa and Google Assistant voice controls, as well as the thoughtful companion app that presents the current PM10 and PM2.5 levels alongside colorful charts of daily, weekly, and monthly air quality measurements.
The Airmega 250S isn’t the most stylish air purifier, but it covers more space than similarly priced models and is quite easy to move between rooms. If you have a large home, this is a top option.
Recommended Room Size
930 square feet
Purification Method
HEPA
Cost of Replacement Filters
$79 each for MAX2 filters
Voice Control Support
Amazon Alexa and Google Assistant
Learn More
Coway Airmega 250S Air Purifier Review
- Quiet
- Energy Star certified
- Connects to Wi-Fi for remote control
- Automatically adjusts speed according to air quality level
- Visual indicator lets you quickly see air quality
- Compatible with Amazon Alexa
- Supports scheduling
- Fan doesn’t oscillate
- Moderate learning curve
- App doesn’t show air quality history
The Sharp FXJ80UW earned high marks in our review because it uses both HEPA and Plasmacluster Ion filtration technologies to rid the air of microscopic pollutants. It performed well in testing, doesn’t make much noise, and has a colorful LED display that tells you the current air quality at a glance.
It’s not cheap, but this Sharp purifier offers an extra layer of protection against dangerous airborne pollutants. It’s the best model we have found that combines HEPA and ion technology. Germ-conscious consumers should appreciate its Spot Mode, which removes odors and germs from clothes, sofas, and curtains.
Recommended Room Size
502 square feet
Purification Method
HEPA, Activated Carbon, Ionic
Cost of Replacement Filters
$90 for HEPA, $80 for Activated Carbon
Voice Control Support
Amazon Alexa
Learn More
Sharp FXJ80UW Air Purifier Review
- Good filtration performance
- Works with Amazon Alexa, Apple HomeKit, and Google Assistant
- Portable
- Loud at high speed
- Lacks IFTTT support
- Limited air quality measurements
Although the Smartmi P1 is the smallest air purifier we’ve tested, it handled our air cleansing tests with aplomb. It doesn’t provide nearly as many air quality measurements as more expensive models, but you still get support for Alexa, Google Assistant, and HomeKit.
The Smartmi P1 is ideal for apartments, dorm rooms, and any other small spaces that require air filtration. It’s also quite portable at a height of just 14 inches and a weight of just over 6 pounds. Replacements for its three-layer HEPA filters are affordable, and you can even order a carbon-activated pet filter if you want.
Recommended Room Size
320 square feet
Purification Method
HEPA
Cost of Replacement Filters
$39.99
Voice Control Support
Amazon Alexa, Google Assistant, Siri Shortcuts
Learn More
Smartmi Air Purifier P1 Review
- 3-stage HEPA filtration
- Fast cleaning performance
- Supports Matter 1.2
- Alexa, Google, and Siri voice control
- Provides energy consumption reports
- Limited air quality readings
- Noisy when running at high speed
- Limited app control
The WELOV Matter P200 Pro is the first air purifier we have reviewed that is certified for the Matter smart home interoperability standard. It supports the Alexa, Google, and Siri voice assistants, with additional integration options to come as third-party device makers adopt Matter 1.2. Recommended for rooms up to 450 square feet, the Matter P200 Pro does a fine job of scrubbing the air of impurities and offers three types of replacement filter options.
If you need a highly interoperable air purifier built for automation, the WELOV Matter P200 Pro is your best bet. Once Amazon, Apple, Google, and SmartThings provide support for Matter 1.2 devices, the WELOV Matter P200 Pro will be able to work to its fullest abilities with all of the major smart home platforms. For now, you can already use it with the most popular voice assistants and create automations to have it interact with other devices from parent company AiDot.
Recommended Room Size
Up to 450 square feet
Purification Method
HEPA, Activated Carbon
Cost of Replacement Filters
$50.99
Voice Control Support
Amazon Alexa, Google Assistant, Siri
Learn More
AiDot WELOV Matter P200 Pro Smart Air Purifier Review
- 3-stage HEPA filtration
- Voice control
- Good purification performance
- Limited air quality readings
- Does not support HomeKit, IFTTT, or Matter
- Lacks power usage reports
- Noisy at high speed
- No remote
The Morento HY4866-WF uses a unique dual-filter design that draws air in from the front and the back of the unit, which makes it effective for rooms of up to 1,076 square feet. Measuring 17.5 by 13.1 by 7.6 inches (HWD) and weighing 7.9 pounds, it’s fairly compact and lightweight, especially for an air purifier with such a large coverage area. Its multi-layer HEPA filters are designed to remove odors and up to 99.97% of airborne pollutants such as dust, smoke, pet dander, and formaldehyde. It supports Amazon Alexa and Google Assistant voice controls and performed well in our air cleaning tests.
If you’re looking for the lowest-priced smart air purifier with the largest coverage area, the Morento HY4866-WF fits the bill. It only tracks PM2.5 levels, whereas some high-end models offer additional air quality insights. It can get loud when operating at high speed, but neither of those drawbacks is a dealbreaker, given its reasonable price.
Recommended Room Size
1,076 square feet
Purification Method
HEPA
Cost of Replacement Filters
Starting at $36.99
Voice Control Support
Amazon Alexa, Google Assistant
Learn More
Morento Smart Air Purifier HY4866-WF Review
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The Best Air Purifiers for 2025
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Buying Guide: The Best Air Purifiers for 2025
What Makes an Air Purifier Smart?
Most air purifiers (not just smart ones) have sensors that measure the density of various airborne pollutants such as nitrogen dioxide (NO2, a toxic gas from car exhausts and power plants), PM2.5 (particulate matter smaller than 2.5 microns in size, including industrial emissions and tobacco smoke), PM10 (particulate matter up to 10 microns, including dust, mold, and pollen), and VOC (volatile organic compounds, or potentially harmful gases from things like cleaning products and paint).
The MyDyson mobile app (Credit: Dyson/PCMag)
Smart air purifiers typically feature Wi-Fi radios that enable them to connect to a companion app, which displays your home’s air quality. Some apps offer graphs of your air quality over time. Dyson breaks it down by pollutant, showing charts for each one.
Most smart air purifiers feature an auto mode that automatically adjusts the fan speed based on the level of pollution detected. They also typically allow you to set up an air purifying schedule, so the machine automatically turns on and off at specific times. Some models feature support for Alexa, Google Assistant, and Siri, allowing you to control them with voice commands.
If a smart air purifier is out of your budget, consider the $69.99 Amazon Smart Air Quality Monitor. This monitor tracks airborne pollution levels around the clock. You can pair it with a traditional air purifier to save money.
Common Contaminants and Their Health Effects
Some sources of indoor air pollution are obvious, like cigarette smoke, household cleaning products, and pet dander. Others are less so.
The US Environmental Protection Agency (EPA) states that thousands of products—including air fresheners, dry-cleaned clothing, and office equipment such as copiers and printers—emit VOCs that can lead to a range of health effects, from headaches to cancer. Moreover, concentrations of VOCs are typically much higher indoors than outdoors.
Sharp FXJ80UW (Credit: Angela Moscaritolo)
Anything that causes smoke—such as cooking, burning candles or incense, or lighting up a fireplace—can lead to elevated concentrations of particulate matter. The EPA says PM10 and smaller can “get deep into your lungs” and, in some cases, your bloodstream. Inhalable particles, especially PM2.5, which is 30 times smaller than the average human hair, may pose a greater risk to those with heart and lung diseases such as asthma, chronic obstructive pulmonary disease (COPD), congestive heart failure, and coronary artery disease. Most smart air purifiers detect PM10 and PM2.5, but some high-end models also report the density of PM1.0 (particulate matter 1 micron or smaller).
Humidifiers can help relieve cracked lips and dry skin, but if you’re not careful to use distilled water and clean them often, they can provide a fertile breeding ground for bacteria and mold, which is then pumped into your air. Gas stoves, especially when not properly vented, can emit unsafe levels of NO2, which can irritate the respiratory system and exacerbate or contribute to the development of asthma.
Another gas pollutant to worry about, especially if you’re renovating or redecorating your home, is formaldehyde. This chemical is found in many household items, including carpets, flooring, furniture, rugs, insulating materials, particleboard, plywood, paint, varnishes, and wallpapers. Long-term exposure to low levels of formaldehyde can cause irritation of the skin, eyes, nose, and throat. Higher levels can cause some types of cancer.
Dyson says that formaldehyde is 500 times smaller than 0.1 microns, making it difficult to capture. Not all air purifiers can detect and break down formaldehyde, and this feature typically comes at a premium price, so that’s something to consider while you shop. Check out our in-depth reviews to see which contaminants each model detects and captures.
Dyson Purifier Cool TP07 (Credit: Angela Moscaritolo)
In some cases, exposure to airborne pollutants may not cause immediate symptoms, but it can lead to serious health problems in the long run. For this reason, the EPA says, “it is prudent to try to improve the indoor air quality in your home even if symptoms are not noticeable.”
Buying an air purifier isn’t the only way to improve your indoor air quality. Other steps you can take include eliminating the sources of your air pollution, opening a window (as long as the outdoor air quality is good), and regularly vacuuming and dusting surfaces.
HEPA vs. Ionic vs. Activated Carbon: Which Filtration Method Is Best?
The machines on this list combat airborne contaminants using High-Efficiency Particulate Air (HEPA) filters, activated carbon filters, ionic technology, and/or UV light.
HEPA air purifiers are the most popular. To comply with the current baseline standard, HEPA filters are tested and certified to remove at least 99.97% of dust, pollen, mold, bacteria, and any other airborne particles as small as 0.3 microns. There are different levels of HEPA filters, but in general, you want to make sure the model you buy meets the baseline standard (many that do have a “True HEPA” label) and stay away from those marketed as “HEPA-like,” “HEPA-type,” or “HEPA-style,” which might not be as effective.
Dyson Purifier Cool TP07 filters (Credit: Angela Moscaritolo)
According to Wirecutter, a NASA study found that HEPA filters can actually capture almost 100% of particles as small as 0.01 microns (10 nanometers), well exceeding the baseline standard. To put that in perspective, COVID-19 is about 60 to 140 nanometers, H1N1 influenza is about 80 to 120 nanometers.
Meanwhile, activated carbon filters are filled with porous carbon that traps gases such as NO2 and VOCs, as well as foul odors, from the air. Activated carbon filters are often combined with HEPA filters, which do not remove gases.
The Dyson Purifier Cool TP07 features a 360-degree filter with a HEPA layer that captures allergens, bacteria, mold spores, pollen, and other pollutants, and an activated carbon layer that removes gases and odors. It also doubles as an oscillating fan. The version that destroys formaldehyde, called the Purifier Cool Formaldehyde TP09, costs $100 more. Dyson says its latest air purifiers, including the TP07 and TP09, not only meet the baseline HEPA filter standard but are also fully sealed to the HEPA H13 standard, meaning they can remove 99.95% of particles down to 0.1 microns.
Activated carbon filter (Credit: Angela Moscaritolo)
The only downside to HEPA and active carbon models is that the replacement filters can be costly (around $50 to $100) and wasteful.
Other models, such as the Sharp FXJ80UW, combine HEPA, activated carbon, and ionic technologies. Sharp’s model features an ion-generating unit that creates positively and negatively charged ions using water and oxygen molecules in the air and disperses them throughout the room. The ions then actively attach to and break down airborne pollutants, such as bacteria, mold, and viruses, before returning to the air as invisible water vapor. Sharp says the technology reduced 94% of E. coli bacteria, up to 87.7% of mold fungus, and 90.3% of MS2 virus in a closed laboratory over a four-hour period.
Recommended by Our Editors
The primary concern about ionic air purifiers is their potential to produce ozone gas molecules, a lung irritant that can exacerbate asthma symptoms and lead to a range of other health issues. The safety of ionic air purifiers came into question in the mid-2000s after it was revealed that the then-popular Sharper Image Ionic Breeze air purifier produced ozone (an issue that eventually bankrupted the company).
As the California Air Resources Board (CARB) warns, some ozone-producing devices are still marketed as air purifiers. The Clean Air Agency maintains a list of potentially hazardous models to avoid.
All models on our list that utilize ionic technology are EPA-compliant, CARB-certified, and considered safe for use in your home for extended periods.
The Best Smart Air Purifier for Large Rooms
Recommended for rooms up to 1,076 square feet, the Dyson Big+Quiet has the widest coverage area of any model on this list. As a more affordable alternative, the Morento HY4866-WF has the same stated coverage area, but you’ll need to change the filter more frequently than with the Dyson model. As another top-rated alternative for large rooms, we also highly recommend the Rabbit Air A3 (1,070 square feet).
(Credit: John R. Delaney)
In my roughly 1,000-square-foot, single-level home, most of the smart air purifiers I’ve tested can detect elevated levels of air pollution from several rooms away. Sometimes, when I’m frying veggies in the kitchen, the Dyson TP07 from the other end of my house even detects cooking smoke and automatically kicks on.
Can Air Purifiers Really Reduce Allergies?
According to the EPA, the effectiveness of air purifiers in reducing allergies caused by larger particulates, such as pollen, dust, mold, and animal dander, is somewhat controversial.
“Most of these particles are found where they settle on surfaces in the home, rather than in the air,” the EPA says. “They cannot be removed by an air cleaner unless disturbed and re-suspended in the air.”
My dog, Bradley, surrounded by air purifiers
Before turning to an air purifier for allergy relief, consider what type of allergies you have. Air purifiers may be more effective at capturing pet dander compared with other types of allergens. According to the American Lung Association, pet allergens “remain suspended in the air for a long time, much longer than allergens from cockroaches or dust mites.” Dust mites, on the other hand, “cling to particles that are too heavy to remain in the air for long” and settle into things like pillows, bedding, and furniture “within minutes.”
(Credit: Angela Moscaritolo)
In my experience, air purifiers aren’t an infallible cure for pet allergies, but they can certainly help. To combat dander from my dog, I usually keep at least one air purifier running 24/7. I find it particularly helpful to have one blowing clean air in my direction at night when my symptoms worsen.
