In past tests, it performed equally well in a 200-square-foot, 1,600-cubic-foot New York City bedroom. However, we expect that price to drop when it hits broader retail. As a rule, it’s wise to “oversize,” which will let you run your purifier on slower and quieter settings while still cleaning a room’s air effectively. Throw in app control and Amazon Alexa support and you’ve got a quality air purifier and fan combination that more than justifies the comparatively high price. Many employ a second filter, containing adsorbent compounds like activated carbon, to capture gases and odors (volatile organic compounds, or VOCs)—but we have not found these to be very effective. The Blueair Blue Pure 311 Auto is similar in capabilities to the Coway AP-1512HH and the two Winix models. Its Auto function, introduced to the Blue Pure lineup in late 2020, monitors your room’s air quality and adjusts the fan speed accordingly. Matches produce millions of very fine particulates, including those in the 0.3-micron range—the hardest size of particle to remove with mechanical filtration like HEPA. It comes with the HEPA filter and carbon pre-filter for effective air cleaning. Manufacturers typically base their room-size recommendations on tests with the machines set on high—no doubt for marketing purposes, but also because CADR ratings are usually based on this setting. At the outset, he burned 15 matches to create extremely elevated particulate levels in the room, as though a fire were burning nearby. Finally, in our 2018 “wildfire” test in Los Angeles, the Coway Mighty reduced a heavy load of incense smoke by 70% in 50 minutes—equaling the performance of some much more powerful competitors—in a room more than twice the size it is specced for. CADR numbers in effect give the cubic feet per minute of perfectly pure air that a purifier can produce on its maximum setting. When we found the CADR numbers in the manuals, we were alarmed. The AM90 is equally as quiet, and its filter replacements cost only a bit less (roughly $43 annually, vs $50); but it draws more power than the Coway on the medium setting we recommend (13.3 versus 8.1 watts), doesn’t have a manual display-shutoff (only an automatic one, on its lowest-speed sleep mode), is physically larger, and only comes in one color—white. Briefly summed up: PECO and PCO use the excitation of titanium dioxide by UV light to produce hydroxyl radicals (OH, one oxygen and one hydrogen atom bound together). Read more in How we picked. Cut down on pollen, smoke, dust and make your home environment full of clean air with our ranking of the best air purifiers, all fully tested, Starting life on the consumer PC press back in 1998, David has been at the forefront of technology for the past 20 years. Generally we only test purifiers with HEPA certification. The operation is simple, using the two-speed dial on the side. Right? This model employs a unique formaldehyde-trapping filter, but we think people with chemical sensitivity should look to the Austin Air HealthMate HM400 for broader odor and molecular-pollution removal. As a product that you can use all of the time, there’s nothing like this, making the Dyson Pure Hot+Cool our air purifier of choice. Filter type: HEPA and Ioniser, Filter life: 6 months, Size: 333 x 133 x 248mm, Max room size: 28 square metres, Number of speeds: 1, Auto mode: No, App control: No, An extremely powerful air purifier that’s ideal for dealing with smoke. Both models also draw far more power than their supposed equivalents among our picks, and both cost the same or more up front. In early fall 2020, we received a few notes from readers about a pair of issues with their Coways. In both cases those numbers were worse than what our budget pick for small rooms, the Levoit Core 300, produced on its medium setting with new filters: 92.6% removal. Can HEPA air purifiers capture the coronavirus? Tim placed an AeroTrak 9306 particle counter 7 feet diagonally away from the purifiers, about 20 inches from both walls in the farthest corner of the room. Another is filter-replacement costs. In the North American definition, “true HEPA” means that a filter removes at least 99.97% of airborne particles of a 0.3-micron diameter in a single pass. This is an air purifier that was designed with performance first, functionality & convenience second. Within 30 minutes, the Coway AP-1512HH Mighty reduced heavy smoke pollution in a 135-square-foot, 1,215-cubic-foot New York office by as much as 99.6%. The Philips AC2889/60 air purifier is a reliable and efficient air purifier, designed and delivered by one of the world’s leading technology brands. Still, there’s a timer option – hourly increments of between one and eight hours – if you want the Air 300 to power down. But surprisingly, the Core 300 also measured a bit better than the Coway AP-1512HH Mighty on medium (87.6%). The quality of air cleaning is the key feature of an air purifier. On medium, it removed an impressive 97.3%. It’s an equally solid choice on performance, but as of October 2020 is only available direct from Winix, where it costs $250. (On this model, you can tell that the ionizer is off when the button is unlit.) Power efficiency is excellent, with max power drawing a peak of 53.8W, and the minimum setting just 7.2W. The purifiers themselves sat at the midpoint of the opposite wall of the room, 2 feet from the wall, with no obstacles near their air intakes and outlets. The more expensive Blueair Classic 480i does. Instead, you’re better off with an air monitor, such as the excellent Foobot, to monitor your home to see what’s giving off VOCs. And by mid-2020, that language had been withdrawn, after many of the company’s claims were ruled against in a case before the National Advertising Division and upheld in a later appeal before the National Advertising Review Board. Another cool feature to mention in this Partu Air Purifier review is the ability to add a drop of essential oils to the fragrance sponge. Since 2013, we have tested more than 40 purifiers and dismissed many more based on their specs. Factoring in their purchase prices as well as running costs, the HM400 and our pick for large spaces, the Blue Pure 211+, cost about the same over five years (about $1,200 versus $1,150). The Philips Air Purifier AC2882/30 is a standing air purifier that is suitable for the whole family at home. The Coway Airmega 200M is virtually identical to our top pick, the Coway AP-1512HH Mighty. In our three-hour test of the Mighty, that machine reduced a heavy load (15 matches’ worth) of smoke by 99.9% in the first hour on high and maintained that level for the next two hours on medium. If they encounter a hydrogen atom, they combine to produce water (H2O). The theory is that ozone, which is highly reactive, neutralizes or breaks down pollutants. I found that the fan never fully turned off, which is a little disappointing. These suggest that this air purifier is designed for people with particularly bad allergies. Over the course of a year of 24/7 operation, at New York’s electricity rates, that works out to about $23, versus the Coway’s $13. With a CADR of 350 cubic feet per minute on high for smoke, pollen, and dust, it handily outdraws most purifiers in its price range and many machines that cost far more. The Vornado AC550 air purifier uses both a sorbent pre-filter (left) and a True HEPA filter (right) to remove pollutants from the air. It has also helped him make informed judgments on factors such as ease of maintenance and operation, the presence or lack of distracting noises or lights, and simple visual impact—the so-called little things that, if done wrong, can make what should be a nearly set-it-and-forget-it appliance into a daily annoyance. The Air Mini outperformed it, but that’s not saying much: It still gave the second-worst performance we’ve ever seen. Ionisation has been shown to reduce the risk of some viruses. Set on high, the Mighty reduced the particulate concentration by 99.9% in the first hour. We recommend avoiding this feature for two reasons. When he’s not here, he’s on his bike. But it’s not as fast or efficient as our top pick, the Coway AP-1512HH Mighty; the dense VOC filter means this machine works slower and consumes more electricity. The Blue Pure 211+ is alone among our picks in not being true HEPA. Well, duh: Any air that passes through a HEPA or medium-MERV filter will be virtually particulate free. Some also employ a class of minerals known as zeolites, whose extremely fine pores allow them to function as molecular filters. That’s nothing like the 99% reductions our top picks achieved on their high settings, but the results were better than one might expect. You should do the same if you try this hack. It was impressive in our tests, reducing particulates by more than 97% on its high setting in 30 minutes in a 135-square-foot New York City office. It’s also quiet (34 decibels) on its medium setting, where it draws a thrifty 6.9 watts. if you need to clean the air in a small space—a bedroom, office, or dorm room up to about 200 square feet—it’s a solid choice. The effectiveness of this air purifier is impressive. However, the built-in air purifier can be used to clean your air, too. One trend we’ve encountered in the scant negative reviews of the Coway Mighty concerns complaints about nonresponsive customer service. We find tower-style machines like the Winix NK100 to be visually intrusive. And it’s worth noting that on September 18, the CDC published—and three days later retracted, citing errors in an internal review process—a version of its guideline that stated that inhalation of aerosolized respiratory droplets “is thought to be the main way the virus spreads.”. We’ve included a variety of products, from the simple, dumb models that simply suck in air to smarter models that can monitor the air automatically, ramping up when harmful particles are detected, so there’s something for every budget here. If your air quality is bad and you don’t have an air purifier, an HVAC filter taped to a box fan is better than nothing. The CADR tests measure purifier effectiveness on three different pollutants—tobacco smoke, dust, and pollen—that correspond to particles of 0.09 to 1.0 micron, 0.5 to 3.0 micron, and 5.0 to 11.0 micron, respectively, so in a sense they are a tougher standard. Featuring a thorough 4-stage filtration system, the NuWave Oxypure Smart Air Purifier draws upon a pre-filter, hygienic BioGuard filter, ozone filter and combined carbon and HEPA filter to offer clean and pure air quality. If you are asthmatic, prone to allergies, or just very conscious of the air you breathe, then you need to invest in a reliable product such as the Blueair purifier. Rather, in HEPA purifiers, a fan draws particles suspended in the air through a dense, felt-like filter that has billions of tiny gaps of varying size. These options are replicated on the slim-line remote control. But if you have an air-quality emergency on your hands—like regional wildfires, or your charred dinner under the broiler—and you have a box fan, tape, the right sort of filter, and no time to buy an air purifier, it’s worth a shot. What settings should you run an air purifier on? The Coway and Blueair scored 87.6% and 99.2%, respectively. In raw performance, it stands among the best purifiers we’ve ever tested, achieving as much as 99.1% removal of airborne particulates in just 30 minutes in our latest test—and that was on year-old filters. We recommend both just as highly. Air purifier owners offer extensive, almost universal testimony that the machines improve their sleep, reduce their allergies, or lessen their asthma symptoms, and recent studies have begun investigating an association between particulate pollution and degenerative brain disorders, including Alzheimer’s disease and Parkinson’s disease. This said, it is to our eyes a more attractive machine than the Winix 5500-2, and it features WiFi connectivity and a basic app that lets you control its settings and monitor its air-quality readings remotely. You can also use our expert advice to improve the air … To create dirty air we burn wooden matches, which produce millions of particles in the 0.3-micron HEPA test-standard range. After a sixth round of testing, encompassing 42 different air purifiers and more than 450 hours of lab and real-world trials, the Coway AP-1512HH Mighty remains our pick as the best air purifier for most people. Purifier manufacturers typically recommend annual replacement, but check the manual to be certain; some call for less-frequent or more-frequent replacement. (The HEPA 0.3-micron standard falls within the scale measured by the tobacco-smoke test.). But in our tests it performed significantly worse, achieving just 77.4% and 55.1% reduction on its highest and medium (speed 6) settings, respectively. But unlike the HEPA purifiers, all of which proved capable of deeply cleaning the air, the Molekule left the air heavily loaded with particulates on every setting. You should keep the doors and windows closed when using an air purifier. Numerous independent lab tests have been done to verify the air purification claims that Airfree makes. The Mighty is also very quiet. The largest of the particulates, about 0.5 micron and above, are captured via impaction: Unable to change their course due to momentum, they simply slam into the fibers and stick to them. Another Winix, the AM90, uses the same HEPA filter as the 5500-2 and delivered virtually identical performance in our testing. If you live in an environment with high levels of both particulate pollution and volatile organic compounds (such as near a farm where biocides are sprayed, a chemical or power plant, or a refinery), we recommend the Austin Air HealthMate HM400. And it has other features we like, including very quiet performance, terrific energy efficiency, and a control panel that automatically dims after you adjust the settings. Tim Heffernan is a senior staff writer at Wirecutter and a former writer-editor for The Atlantic, Esquire, and others. Finally, it is compact, standing just 18 inches tall, 10 inches deep, and 17 inches wide, about the size and shape of a large beach tote. In that case, we’ve learned that simply placing a US or Canadian quarter over the lamp completely blocks out its light, while letting you easily check the indicator if and when you want to. The GermGuardian AC5900WCA was a stellar performer in our 2019 test, reducing particulates by 99.3% on high and 98% on medium. (We do this because manufacturers often give inflated claims about the size of room their purifiers will work in.) Despite their decent-to-solid performance, we don’t recommend either one. The two machines are similarly quiet, with the Airmega 400 registering 40 decibels on its “quiet”/high-medium setting and the Blue Pure 211+ measuring at 43 decibels on medium. Once the air filters have been clipped into place, the Pure Hot+Cool can be controlled using the remote control that magnetically attaches to the top of the fan blade. 9 The Blueair was also a runner up on the list for top air purifiers by Apartment Therapy. Wirecutter is reader-supported. Delivering exceptional performance in an attractive form, the Blue Pure 311 Auto’s lack of a display shutoff and higher running costs are its few knocks. Get past the exterior, which is easy to do when you consider that you’ll likely tuck this product out of the way, and there’s a lot to like here, as this is one of the most powerful air purifiers that we’ve tested. Those results actually beat the performance of the similarly priced Coway AP-1512HH Mighty, our top pick, despite the GermGuardian’s slightly lower CADR numbers. It virtually eliminated particulates from our test room, reducing them by 99.9% on its high and medium speeds. It only comes in dark gray, lacks Wi-Fi connectivity, and uses a one-year VOC filter, versus the AM90’s three-month filters. If you have specific concerns about VOCs, the HM400 is by far the best portable air purifier we’ve ever found. And no box fan is engineered to withstand the extra workload of driving air through a dense filter, so we can’t claim this won’t damage the fan’s motor, and we wouldn’t consider it a long-term solution for air-quality issues. We are continuing to test the Mila air purifier, a promising entrant in the nascent category of truly smart air purifiers. The Levoit Vista 200 is a small-space machine, and it’s one of the best-selling purifiers on Amazon. In both cases, that’s a bit better than the Coway AP-1512HH, though in practice the differences are moot: Both machines, when used continuously as they are in most homes, will drop particulates to near zero in under an hour—and keep them there. With this model, the airflow can be redirected out of the back of the fan, so the purifier can run in winter without blasting you with cold air. Cleverly, the front display shows you the current air quality, so you can see when your air is dirty and when it’s clean. On medium—which we set as fan speed 6 of the 10 speeds available—the TP04 managed just 74.4% reduction. But its performance is not equal to that of our current budget pick, the Levoit Core 300. It’s crazy to introduce a new pollutant when the goal is to reduce pollution overall. The Levoit LV-H134 also costs about $400 and has lower specs than the Coway. The net result is that virtually all particles get captured quickly, while airflow is only slightly impeded. That’s why we’ve always measured purifier performance at a considerable distance from the machines, outside of the path of the cleaned airflow. Based on our tests of the Molekule Air, we forewent the “ambient” testing and instead granted the Mini the same handicap of “clean air” tests, reducing the match smoke between tests with our pick for large spaces, the Blue Pure 211+. We advise anyone debating between them to compare their prices (and appearances) and purchase whichever model you prefer. In 2018, we declared the Blue Pure 211+ “the stiffest competition we’ve found for the Coway AP-1512HH Mighty,” our long-standing top choice for general use. At the start of each test, he measured the ambient air quality for three minutes to get a baseline; after that, he burned five wooden matches and let the smoke circulate for two minutes to artificially raise the particulate levels in the air, and then he ran the machines for the remaining 30 minutes. It’s best to choose your air purifier based on how effective it is at the pollutant you want to remove. *At the time of publishing, the price was $300. On its quiet/medium setting, it delivers CADR 231 performance for smoke, pollen, and dust—roughly what the Coway Mighty delivers on high. But we do place a premium on manufacturers of long standing, with a record of customer service—and these pop-up manufacturers lack both. Under known bad-air conditions, such as during a nearby wildfire, we recommend running purifiers on high for an hour and thereafter on quiet/medium. Back to purifiers: The virus that causes COVID-19 is approximately 0.125 micron (125 nanometers) in diameter. Then we use a professional particle counter to directly measure how well the purifiers remove the smoke from the air. However, compared with the other large-space purifiers we’ve tested, the Blue Pure 211+ is similar in its five-year cost. The oft-overlooked aspect of health is the air that we breathe at home. Each machine had been running continuously on quiet/medium for at least six months in Tim’s apartment over the previous year, ensuring that the old filters saw heavy use. And at that speed, the Mini’s performance on particulate removal tanked: It cut the match smoke by just 63.3% in 30 minutes. In our years of testing, one dead-simple measure has proven to be a good proxy for a purifier’s performance: the volume of air it can move. You won’t worry about dust, bad smell, pollen, harmful microorganisms and tobacco smell. John Holecek, who co-wrote and performed testing for previous versions of this guide, holds a master’s degree in earth science, with a focus on climate, aerosols, and analytical chemistry. It was an exceptional performer in our testing, and it’s quiet and attractive to boot. However, it has excellent clean air delivery rate (CADR) certifications from the Association of Home Appliance Manufacturers, which in some ways is a more rigorous measurement. We ran our original test model for two years without replacing the filter, and it still performed as well as it did on day one. We still prefer the Coway for its lower energy consumption, smaller footprint, display-shutoff feature, and more attractive look, but it’s a close race. And we like the GermGuardian’s clean looks and clever night-light feature: a small blue circular LED that glows through the machine’s seamless white faceplate. Blueair recommends that the filter be replaced “every six months or so.” Following that schedule, you’ll spend $80 a year on replacements, versus about $50 or less for the Coway AP-1512HH and the Winix machines. It adds Wi-Fi capability and a rudimentary app, and it costs a few dollars more than the 5500-2. On its quiet, or medium, setting it delivers 3 ACH, which keeps the air extremely clean under normal conditions. (Human hair, for reference, is usually between 20 and 180 microns across.) (You can’t physically block the glow with a coin or tape, because doing so would block the Molekule’s delivery of air.). Based on our seven years of testing, we know that 4 ACH ensures rapid and nearly complete cleaning of highly polluted air—a big concern during, say, a wildfire—and that anything below 4 ACH typically results in measurably worse performance. The categories also broadly correspond to price—the larger the space, generally the more expensive the purifier you need to keep the air clean. In a 500-square-foot space with 8-foot ceilings, that means it makes 5.3 ACH on high, well above our 4 ACH threshold. We do dismiss air purifiers that rely on ozone (O3, a molecule composed of three oxygen atoms) to “purify” the air. In our own tests, we found that the Blueair Classic cleaned out the smoke from a smoke pellet in 5m 41s – the fastest that we’ve seen. Volatile Organic Compounds (VOCs) are harmful chemicals that are often found in cleaning products, paints, and some beauty products. The Blue Pure 211+ Auto, available January 18, is an updated version of our large-space pick. Hence our emphasis on air changes per hour. Here’s a list of what to do: Remove the wrappers. Air purifiers are becoming a regular fixture in the home due to the latest fires in many parts of Australia, and some of them can filter smoke particles particularly well. If the AM90 is unavailable, the otherwise identical Winix AM80 is worth considering. The Coway Mighty has also demonstrated the ability to maintain its high performance for years, even as we’ve pushed its filters far beyond their stated one-year lifespans. We like that it automatically shuts off the white LED lights on its control panel, on top of the unit, after a few moments. In a pair of baseline background tests, which we use as a control measure, 0.3-micron particulate levels dropped by 13.9% and 15.3% on their own. But to be considered one of the top 10 air purifiers, it has to be powerful enough brand to clean the air of allergens, viruses, mold, dust, smoke, and other fine particles; all of which you’ll find below in our best rated air purifier reviews for home use. On Silent, it performed worse yet, reducing 0.3-micron particulates by 6.5% (ambient) and 7.2% (clean). Here’s the takeaway: In the case of a nearby wildfire or other ongoing pollution crisis, where ambient local air conditions are continuously bad, keeping your air purifier on high is probably the best practice. 10-40k. It’s not our top pick for several reasons: It’s larger and, to most eyes, not as attractive; it lacks a display-shutoff except when it’s on its lowest fan setting; and it draws more electricity, contributing to slightly higher running costs. It uses the same HEPA filter, has virtually identical Clean Air Delivery Rate, can deliver 5 air changes per hour in a 350-square-foot room on high, and performed virtually identically to the 5500-2 in our tests: 99.8% reduction of 0.3 micron smoke particles on high and 94.9% on medium, over the course of 30 minutes, compared to 99.9% and 97.3%. It’s attractive and compact, measuring just 14½ inches tall and 8½ inches in diameter, and its display-shutoff feature means it won’t interrupt sleep with bright lights. Air purifiers use a fan to pull in dirty air at one end, remove pollutants, and output clean air at the other end. (Compare that with the Blue Pure 411’s measurements: 87.2% on high and 70.7% on medium.) However, the Air and Air Mini also employ a physical prefilter—the Air’s rated MERV 13, per the NARB report, meaning not far below HEPA filters in efficiency—to capture particulates. However, it’s much weaker on CADR specs than our small-space pick, the Levoit Core 300, and it produced very poor results in our tests: just 58.0% and 59.2% reduction of particulates on high and medium, respectively, versus the Levoit’s 97.4% and 92.6%. This is how we make money. Every consumer loved it. It’s easy to forget the occasional obligation of replacing your purifier’s filters—set a calendar reminder. 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