Performance: In terms of CADR, this air purifier scored 232, 243 and 246 for smoke, dust and pollen. This puts it amongst some of the top performers of those I tested, especially for pollen. It was also the runner up for energy consumption, requiring only 0.105 kWh over 24 hours — so it won’t cost an arm and a leg to run. Noise was admittedly a little hit and miss; it was fairly quiet on its lowest setting at 35.3dB, however it reached 59.8dB at maximum, which was second only to the Blueair Blue Pure 211+ Auto at 60.8dB. In terms of the Plasmawave technology, I didn’t notice any specific change to the air purifier when it was activated. But, with such high CADRs, it does question its necessity.

This air purifier takes air through four stages of filtration: The washable fine mesh pre-filter is the first line of defense against large airborne particles, followed by the washable carbon filter for VOCs and odors, and then the true HEPA filter for airborne particles as small as 0.003 microns. Lastly, the Plasmawave technology disperses ions into the air, which attach to air pollutants and break them down. The Dyson stood up incredibly well over six months of testing at home. Despite running it 24/7 for months, we had no issues with it and it continued to perform as if it were brand new. It made such a difference in our old, drafty house that we didn't notice our allergies acting up anymore after using it for several months. The air purifier cut down on pet dander in the air, while the humidifier kept the air moist enough to decrease dry skin. It comes with a three-stage HEPA filter, and there are three customizable options for replacements when it's time for a new one: a pet allergy filter for those with pets, a filter designed to absorb toxins, and a smoke-removing filter. Better Homes & Gardens / Dera Burreson Your Questions, Answered What type of particles can an air purifier capture? During our tests, the Bissell Air400 Professional air purifier performed the best against smoke out of all the devices we tried. After adding smoke to an enclosed space with the air purifier, the device accurately registered a hazardous level of PM 2.5 on its screen, but after just five minutes it reduced the levels by more than 990 points to a healthy level again.

The 625A model is designed to be easy to move from room to room. It only weighs 16.8 pounds, has a handle, and measures 22 inches high by 16.5 inches wide by 10 inches deep. The numbers translate to how many cubic feet of air the purifier can clean per minute. The standard goal is to clean a full room’s worth of air in 15 minutes. So, for instance, a 300-square-foot room would need an air purifier with a CADR of 200 or so, assuming ceilings were 10 feet high and any doors and windows were closed. Its sensors continuously analyze the air and diagnose pollutants in the room, then display live PM 2.5 levels on the screen so you can monitor your air quality in real-time. The HEPA filter will capture 99.97% of airborne particles from the air, then seal these particles away so they can't escape out of the device. We reported that after consistently using this air purifier, we experienced fewer allergy symptoms than usual. On low mode, we found that the Bissell Air400 Professional air purifier is whisper-quiet at just 40 decibels, though it can be a bit noisy when run on high (80 decibels). However, even on the low mode, it drastically reduced PM 2.5 levels in a room in under 10 minutes.

Some devices have additional filters, like carbon or charcoal filters, that trap the petroleum-based gases known as volatile organic compounds (VOCs). Carbon filters also act as natural deodorizers, which makes them suited for the kitchen, too. Though we liked the compact size and lightweight design of this portable air purifier, we found during testing that it wasn't very effective at removing particles from the air. While many other models could reduce PM 2.5 levels from hazardous to good in under 10 minutes, the Pure Enrichment mini air purifier levels remained hazardous (though they decreased slightly). Indoor air quality also matters for the transmission of airborne infections, such as influenza, measles, or COVID-19," Carroll says. "Indoor Air Quality (IAQ) affects everyone, especially the most vulnerable—children, the elderly, and people with health conditions like asthma and heart disease. Air purifiers that are Energy Star certified must meet energy-efficient specifications set by the Environmental Protection Agency, which help to save you money in the long term. You may also want to look out for the Association of Home Appliance Manufacturers (AHAM) Verifide label, which indicates that the product has undergone independent testing to verify its CADR and claimed room size.

You'll be able to connect the Coway Airmega 400S to an app, which allows you to see more detailed insights about your home's air quality, access reports over different periods of time, manage the device's settings, and more. We had trouble finding the app on our phones since this device's manual didn't include a QR code, and it took several minutes to get everything connected. However, you can also use the Coway Airmega air purifier without the app by using the buttons on top of the machine. Those who didn’t like the air purifier mainly pointed to trouble connecting to their WiFi and not being happy with the air purifier’s odor control. One reviewer wrote that they specifically bought the air purifier to clear their room of cigar smells, but could still smell cigar smoke two days after running the air purifier. Another bought it to control smells from their cat litter, and another to get rid of cooking odors from their neighbor. Both were disappointed with the odor removal. Should you buy the RabbitAir MinusA2 spa-780N?

Performance:A truly powerful device, the HPA300 scored second to the Blueair Blue Pure 211+ auto on the CADR test. With an average CADR score of 300, 320 and 300, it performed slightly better on dust versus pollen and smoke and would suit rooms of up to 465 sq ft. However, that performance comes at a price, because it consumed more energy than any other air purifier I tested, at 1.002 kWh over 24 hours, and it was on the noisier end of the spectrum, producing 59.6 dB on its loudest setting. The Blueair HealthProtect 7470i produced just 48dB on its highest fan speed by comparison. I like that the 625A is Energy Star-certified so I don't go broke trying to clean my indoor environment. There are low, medium, and high auto modes that adjust the sensitivity of the air quality sensor. The higher the sensitivity, the faster the fan will clean the air when irritants are present. When there are few pollutants, the fan will operate at a low speed. You can also set the air purifier to automatically turn off after four, eight, or 12 hours. Most air purifiers will list the maximum square footage they are able to clean. You can calculate the square footage of your space by multiplying the room’s length by its width. Government agencies and professional groups, including the EPA and the American Lung Association, recommend True HEPA filters as the standard for air purification. These filters trap 99.97% of particles that are at least 0.3 microns in size.In our ambient air quality test, the air purifier lowered particles in the air measuring 0.3 microns in size by 45% after 15 minutes on low speed and by 60% after 30 minutes. On turbo speed, it lowered particle count by 75% after 15 minutes and 83% after 30 minutes. The rate of particle absorption was similar when the room was filled with smoke from matches and incense. On low, the air purifier cleared the room by 38-50% after 15 minutes and 55-73% after 30 minutes (air particles ranged from 0.3 microns to 10 microns in size). On turbo speed, the room cleared by 67-80% after 15 minutes and 84-90% after 30 minutes. It also comes with a simple user interface that gives real-time air quality updates and automatically alerts you when it is time to clean or replace your filters. You’ll also find controls for setting the fan speed, auto mode, sleep timer (up to 12 hours), and the negative ion generator. We were particularly impressed with the ultra-quiet operation of this air purifier—it’s easy to forget that it’s even running. Note that this is not a smart air purifier, nor does it come with a remote control, so you’ll have to use the controls directly on the unit.