Technology The 6 Best Air Quality Monitors of 2021 - Treehugger
Technology The 6 Best Air Quality Monitors of 2021 - Treehugger |
- Technology The 6 Best Air Quality Monitors of 2021 - Treehugger
- Airthereal Air Purifier with HEPA Filter Is on Sale at Amazon | PEOPLE.com - PEOPLE.com
- The Best Air Purifier - The New York Times
| Technology The 6 Best Air Quality Monitors of 2021 - Treehugger Posted: 26 Mar 2021 08:11 AM PDT /GettyImages-1188215557-045cdd556c524fab97301da17e0868aa.jpg) Our editors independently research, test, and recommend the best products; you can learn more about our review process here. We may receive commissions on purchases made from our chosen links. With an air quality monitor, you can get a better idea of various pollutants in and around your home and office. You can also analyze the conditions when they're at their peak. With more information, you can have peace of mind about the air you breathe and also decide if you need to take action to clean up your air. Although air quality metrics vary widely from city to city, air quality in the United States has generally improved since the 1970s, when advocates began pushing for better pollution controls (more on that in the FAQs below). In addition, recent changes to air quality standards and a shifting climate have increased consumer interest in real-time air quality monitoring. We've put together this list of the best air quality monitors available on the market today to help you keep an eye on the quality of the air you breathe. Final Verdict A reliable, real-time air quality monitor can give you more information, peace of mind and control over your personal environment. For an all-in-one, compact, Smart-Home capable, customizable air quality monitor that is capable of giving actionable feedback, it's hard to beat our Best Overall monitor, the Airthings Wave Plus (view on Amazon). When you're on the go or need outdoor air quality data, consider the portable and wearable Atmotube Pro Portable Air Quality Monitor (view on Amazon) that can stay at your side for a week on a single charge. What to Look for in an Air Quality MonitorWhich pollutants it measuresWhen choosing an air quality monitor, you first want to be sure it measures the particles and gasses that cause the greatest risk in your home or office. For example, those with wood-burning stoves should ensure their air quality monitor measures carbon monoxide. Many on the market today detect a combination of particles and gasses all in a single monitor. Particulate sizeWhen measuring particulate matter, make sure your monitor measures particles that are 2.5 microns or larger in size (PM2.5). Older monitors could not detect these smaller particles that can travel deep within our respiratory system. For comparison, a human hair is about 70 microns thick. Those monitors that claim to detect mold are usually including mold spores in their PM2.5 measurement rather than detecting it directly. Display and featuresWhen choosing a monitor, you'll want one that is easy to use and well-rated for accuracy. Many are capable of pairing with your phone or computer to increase display options and screen size. You'll also need to consider whether you want a stationary or portable model and whether your monitor will plug into a standard electrical outlet or use rechargeable batteries. Smaller portable units can be highly useful if you travel from place to place for work, but they also can have limited battery life and small display screens. So it's important to consider each of these factors when making your selection. Understanding AQI Most air quality monitors meant for home use report an Air Quality Index (AQI). The index was developed by the U.S. Environmental Protection Agency (EPA) to streamline air quality information for the general public. It combines all of its air quality measurements of ground-level ozone, particle pollution (PM2.5 and PM10), carbon monoxide, sulfur dioxide and nitrogen dioxide into a single number that ranges from 0 to 500, with 500 being the highest level of air pollution. Not all monitors that report AQI measure all of these pollutants, but most will display an AQI estimate and then offer users the ability to use monitor or app menus to dive deeper to see actual numerical values and graphed data over time. FAQsWhat are air quality monitors and how do they work?Although all air quality monitors are not created equally, most measure particulates, carbon dioxide, carbon monoxide and volatile organic compounds (VOCs). The world is paying attention to particulates because they are tiny unseen floating particles suspended in the air — like dust, pollen, soot, and mold spores — that can be inhaled. When they reach the delicate cells in your lungs, they can cause allergic reactions, inflammation or in some cases, remain lodged in lung tissue causing cell death, infection, or tumors. VOCs are common organic chemical gasses like acetone, methanol, benzene, ethanol, toluene, and formaldehyde that evaporate into the air from manufacturing processes, gasoline and diesel exhaust, and from a wide range of fossil-fuel-based products and surfaces. Many household items off-gas, like flooring, adhesives, paints, and furniture foams, either when they are new or gradually as they age. You may have heard of VOCs because they are the chemicals that undergo photochemical reactions (in sunlight) with nitrogen oxides to form ground-level ozone, or smog, that contributes to climate change. Air quality monitors measure these particles and gasses with electrochemical sensors, infrared and UV lasers, and light detectors. Electrochemical sensors measure carbon monoxide by reacting with small amounts of the gas. This oxidation reaction creates a small change in electrical current on the sensor's surface that is then measured, quantified, recorded and displayed. The change in electrical current is proportional to the amount of gas in the air. Carbon dioxide is often measured by shining infrared light through the air sample inside the monitor. Carbon dioxide absorbs the light, so higher concentrations absorb more light than lower concentrations. Detection of particulates and VOCs use similar methods. VOCs use UV light instead of infrared light. Particulates use a laser with varying wavelengths of light. Air quality monitors are calibrated by the manufacturer by measuring known concentrations and developing a pattern of detection. So, it's important to recalibrate monitors according to the manufacturer's instructions to ensure they continue to produce accurate results over time. How can I improve my air quality?If you discover your local air quality needs improving, there are a number of simple things you can do to improve your conditions. From adding houseplants, cleaning your air ducts to using an energy-efficient air conditioner, or trying an air purifier, you can make a big difference right at home. Is air quality getting worse?In the 1960s, scientists began investigating the link between air pollution and human health. States passed legislation to reduce air pollution emissions. Then in 1970, Congress passed the Clean Air Act Amendments that established air quality standards for the U.S. As a result, the U.S. ranks well compared with many other countries for its air quality. When the pandemic shut down factories, refineries and vehicle traffic, we saw incredible, yet temporary, improvements in air quality. These standards are set for industrial and municipal emissions but don't account for the microscopic dust, dirt, cleaning chemicals, mold, and bacteria that are weightlessly floating unseen around our homes both indoors and out. Climate change is also having a negative effect on air quality. New research looking at the last three decades of pollen counts has shown that our "pollen seasons" are now starting earlier, lasting longer and even increasing in concentration by more than 20 percent. The changing climate has also increased the incidence and severity of wildfires in the Western U.S. For example, the number of large wildfires has doubled in Western States since 1984. The smoke from these fires is a major source of air pollution. Air quality varies from region to region, but these changes are impacting allergy and asthma sufferers and could translate to long-term impacts like increases in overall asthma and allergy rates, lung-related illnesses and possibly even reducing the lifespan for our most vulnerable. But thanks to improvements in technology and increased consumer demand, we can now affordably monitor the air quality of our own homes, yards and businesses with electronic air quality monitors. Why Trust Treehugger?Author Lorraine Wilde holds a master's degree in environmental science and has several years experience working on the cleanup of contaminated hazardous waste sites that degraded our air quality and posed a toxicity risk to both humans and the natural environment. She is a firm believer that consumers can make informed choices that protect our delicate planet.  |
| Airthereal Air Purifier with HEPA Filter Is on Sale at Amazon | PEOPLE.com - PEOPLE.com Posted: 22 Jan 2021 12:00 AM PST  Products in this story are independently selected and featured editorially. If you make a purchase using these links we may earn commission. As many people continue to work from home due to the pandemic, it should come as no surprise that air purifiers and humidifiers have become more fashionable than ever. With so much time spent inside, breathing fresh, unadulterated air has never felt so essential. And if you've been considering snagging an air purifier to revive the home office, now's the time: Amazon has launched a limited-time deal on an Airthereal air purifier, slashing the price by 30 percent. The high-performance air purifier is built with a HEPA filter that gets rid of nearly 100 percent of teeny airborne particles, such as dust, smoke, and things that can cause odors. The machine is powerful enough to purify an area up to 335 square feet. Turn it on for the first time, and within 10 minutes, you'll notice a difference in air quality, according to the brand. The system recommends replacing the filters every six months, which can also be purchased on Amazon. Buy It! Airthereal APH260 Air Purifier with 3-Filtration-Stage True HEPA Filter, $91.52 (orig. $129.99); amazon.com Amazon shoppers rave about the air purifier, which has picked up over 1,700 five-star ratings. Customers call it "useful and quiet" and "lightweight and easy to use." Many recommend purchasing more than one, so you can breathe clear, crisp air in the bedroom, living room, home office, and basement — or any other room where you spend a considerable amount of time. Plus, the sleek and understated design allows it to blend in to any space. "The Airthereal made my very old basement condo go from old smelling to so fresh and so clean in 24 hours," one Amazon shopper wrote. "I was going through chemo and needed my place to be super clean and germ-free with minimal effort and without toxic chemicals. I let this run constantly… Even on full blast, the air purifier is audible, but still quiet and soothing. I honestly think it could compete with the $600+ air purifiers on Amazon." This air purifier is built with a smart control that automatically measures the air quality and selects the appropriate air purification mode. And when you're ready for bed, just enable sleep mode, which ensures the machine runs quietly throughout the night. "I get terrible allergies and with all of the smoke here in Colorado, I've had the worst respiratory symptoms whenever I go outside," another shopper wrote. "Ever since getting this, my post-nasal drip has gone away and I don't have random sore throats and allergy congestion. It's made a huge difference inside my house." The Airthereal air purifier just might be the answer to guaranteeing pure air in every room, and it's on sale at Amazon for the rest of the day. Shop the air purifier before this Amazon Deal of the Day expires and reverts back to its original $100+ price.  |
| The Best Air Purifier - The New York Times Posted: 03 Mar 2021 12:00 AM PST  2020 testsThe Blue Pure 411 Auto is an upgraded version of our former budget-pick Blue Pure 411. It adds an air-quality sensor and, as a result, an automatic setting, in which the machine adjusts itself to address changing pollution levels. Like the 411 (see "2019 tests" just below), it's a small, attractive, quiet, and highly energy-efficient machine, and a fine choice if you favor those features. But its performance is not equal to that of our current budget pick, the Levoit Core 300. The Airmega 150 is the first small-space machine from that company. It's sharp-looking, with a clean rectangular form and muted, matte finish; and in addition to white, it comes in a pretty sage green and, soon, a soft pink. It performed quite well in our testing, capturing 98.2% and 78.5% of smoke particles in half an hour on high and medium, respectively. It's also quiet (34 decibels) on its medium setting, where it draws a thrifty 6.9 watts. But at a price of $190, it's too expensive for a machine made for spaces no larger than a bedroom. You can get the much more powerful Winix AM90 or AM80 for about the same, and the Winix 5500-2 or 5300-2 for less. The Airsoap, unlike all the other purifiers we have tested, does not contain a physical filter. Instead, it uses washable, electrically charged plates to capture airborne particulates. It did reasonably well in our testing, removing 95.2% of the smoke on high and 89.7% on medium. But our top picks from Coway, Winix, and Blue Pure performed far better. Airsoap's claim that it will save you "thousands" in the cost of replacement filters is ridiculous—you'd have to replace the filter on the Coway AP-1512HH 20 times to reach even $1,000, meaning you'd have to run it for two decades. And the need to frequently wash the plates, and, once a year, take the whole machine apart and give it a deep clean, sounds like a hassle rather than a selling point. At a cost of $1,000, the Aeris Aair 3-in-1 Pro is a high-end purifier—a growing category that we plan to explore in depth in the future. In addition to its HEPA filter, it contains a large VOC filter composed of 2.2 pounds of activated carbon and alumina. That should make it far better at capturing VOCs (odors and other gases) than the tiny VOC filters most purifiers contain. The HEPA filter is also treated with an antibacterial coating that, Aeris says, "reduces risks of infection when replacing filters." (That risk is already extremely low, as HEPA filters are not a conducive environment for bacterial growth to begin with.) But while it tested well, the Aair did not perform any better on particulates than our much less expensive pick for large rooms, the Blue Pure 211+. The Aair reduced particulates by 98.1% and 94.1% on high and medium in our 30-minute tests; the 211+ achieved 99.3% and 98.4% reductions in identical conditions. Another knock on the Aair: The filters last only six months, and replacements cost $200. 2019 tests and contendersThe Blueair Blue Pure 411, our former budget pick, performed well for a small-space purifier and is exceptionally energy efficient. Running on medium 24/7, it only consumes about $6 of electricity per year. Replacement filters every six months, at $22 apiece, will cost $198 over the course of five years (nine new filters). That makes it far cheaper to own than our new top pick for small spaces, the Levoit Core 300, which may cost $480 over five years for filter replacements and electricity. However, performance is our most important measure of a purifier, and the Levoit far outperformed the Blue Pure 411. We will be testing the new, slightly more powerful Blue Pure 411+ once we have access to our New York office again. In 2019, we tested two of Dyson's latest-generation air purifiers, Pure Cool TP04 and Pure Hot+Cool HP04. Of them, the TP04 performed better, but neither measured up well against our top pick, the Coway AP-1512HH Mighty, and our large-space pick, the Blueair Blue Pure 211+. On its highest setting, the TP04 reduced particulate pollution by 86.6% in 30 minutes; compare that with 98.9% and 99.3% from the Mighty and the Blue Pure 211+, respectively. On medium—which we set as fan speed 6 of the 10 speeds available—the TP04 managed just 74.4% reduction. The Coway and Blueair scored 87.6% and 99.2%, respectively. The Dyson Pure Hot+Cool HP04, which incorporates a space heater as well as a purifier, in theory should have performed somewhat better than the TP04 because it can move a slightly greater volume of air. 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. We cannot recommend either Dyson purifier, especially given their high price relative to those of our much higher-performing picks. We have also found no evidence that the machines' fan function, as Dyson claims, makes them superior to other purifiers in the distribution of filtered air throughout a room. In fact, our years of testing have shown that any appropriately sized purifier will distribute filtered air evenly, into the farthest corner of a room. We have not tested the Dyson Pure Hot+Cool HP06 Cryptomic purifier, but spoke at length with a Dyson engineer and representative about it. In terms of particle filtration, it is virtually identical to the Pure Hot+Cool HP04 (see preceding paragraph), using the same HEPA filter and featuring only marginally lower airflow. We would not recommend it for the same reasons we do not recommend the HP04. The HP06 adds a molecular formaldehyde filter, which Dyson calls the Cryptomic. We tested two purifiers from Medify, the MA-40 and the MA-112. The smaller Medify MA-40 has specs similar to those of our top pick, the Coway AP-1512HH Mighty, and in fact it achieved the same reduction in particulate pollutants: 98.9% on high. It's also a good-looking and well-built appliance, with a glass touchscreen (not plastic as on most purifiers). But it's a loud machine, measuring 52 decibels (above our 50-decibel definition of "quiet") on its medium setting and 42 on low. For comparison, the Coway Mighty measures 39 decibels on medium and 31 decibels (nearly inaudible) on low. Typically, this Medify model also costs more than the Coway. The huge and exceptionally powerful Medify MA-112 has the highest CADR rating we've ever seen: 950. (That's almost three times more cubic feet per minute than with our large-space pick, the Blueair Blue Pure 211+.) It virtually eliminated particulates from our test room, reducing them by 99.9% on its high and medium speeds. And for such a powerful machine, the MA-112 is surprisingly easy on the ears, registering as "quiet" on its low, low-medium, and high-medium speeds (39, 42, and 47 decibels, respectively). But this model is physically huge, at 28 inches high and 15 wide, and it's a rare home that has an open space big enough to demand such a powerful purifier (Medify says casinos use it to clear cigarette smoke). It has historically cost upwards of $750; we have seen it dip to near $500 at times, which is closer to being competitive with our other picks, but again: only if you really need to clean a vast space. The GermGuardian AC5900WCA was a stellar performer in our 2019 test, reducing particulates by 99.3% on high and 98% on medium. 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. 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. (You can turn the night-light and the display lights off if they disrupt your sleep.) But we also found it to be much louder than the Mighty, measuring 47 versus 39 decibels on its quiet/medium setting, and the quality of the sound was rough and whooshy, versus the Mighty's steady white noise. This model is far more expensive to run, as well, requiring a $70 replacement filter every eight months (versus $50 once a year for the Mighty) and using about $64 versus $14 of electricity annually if run 24/7 on medium, due to its much higher energy consumption. Over five years, the GermGuardian will cost roughly $900 versus the Coway's roughly $470. The Levoit LV-H133 is another competitor to the Coway AP-1512HH, and it produced similar test results—98.8% and 92.9% reduction in particulates on high and medium, versus 98.9% and 87.6%. But it's more expensive up front and over the course of five years' upkeep, and its taller form and higher noise output make it visually and audibly intrusive. The Levoit Vista 200 is a small-space machine, and it's one of the best-selling purifiers on Amazon. 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%. Our previous top pick among large-space purifiers, the Coway Airmega 400, is a stellar performer, registering 99.9% and 99.7% reduction of particulates on high and medium, on both new filters and filters that had been run 24/7 for a year. Those figures slightly topped the results from our current large-space pick, the Blueair Blue Pure 211+, which came in at 99.3% and 99.2% on new filters and 99.3% and 98.4% on filters that had been run 24/7 for eight months. 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. But the Blue Pure 211+ came out on top on cost: It typically sells for $300 versus the Airmega 400's $500. While we were researching and writing this guide, LG discontinued its Air Purifier Tower AS401WWA1 and PuriCare Air Purifier Round Console. Some units may still be available as dead stock, but the world needn't lament the fallen. The Tower had much lower specs than our top pick, the Coway AP-1512HH Mighty, yet it cost $400—more than twice as much. The Round Console was also weaker on specs and higher priced than the Coway, at $300. The Inofia PM1320 claims to work in rooms as large as 800 square feet. Based on its specs, it's appropriate for rooms of just 287 square feet (where its CADR numbers result in our recommended 4 air changes per hour). The Pure Company's Large Room Air Purifier usually costs $400 but has lower specs than those of the much cheaper Coway AP-1512HH Mighty. The Levoit LV-H134 also costs about $400 and has lower specs than the Coway. Although the Winix FresHome P150 is similar in physical size to the Coway AP-1512HH Mighty, it has specs well below those of a small-space purifier. Winix's HR900 Ultimate Pet Air Purifier has far lower specs than that model and our less expensive top pick, the Coway AP-1512HH Mighty. We find tower-style machines like the Winix NK100 to be visually intrusive. The NK100 also has lower specs than the Coway AP-1512HH Mighty and typically costs a bit more. The otherwise identical Winix QS and Winix NK105 add dubious features (a Bluetooth speaker and Wi-Fi connectivity, respectively), and both of those models usually cost more than the Coway. The Hathaspace Smart True HEPA Air Purifier has solid reviews and costs a bit less than the Coway AP-1512HH. For that price, though, you get a machine that's barely a third as capable: The Hathaspace delivers 2 air changes per hour in a 350-square-foot room, whereas the Coway delivers 5.7. Dyson calls the Pure Cool Me BP01 a "personal purifying fan"—it's designed to deliver a focused stream of air onto a person's face from a bedside table or an office desk—and does not consider it a whole-room purifier, so we didn't test it. TruSens, an air-purifier maker that launched in early 2019, made a splash in earning a RedDot Design Award. But only the largest model, the Z3000, is true HEPA; the smaller Z1000 and Z2000 are "HEPA-type," which is to say, not true HEPA. And the company uses 2 air changes per hour to calculate its square-footage ratings, whereas we set 4 ACH as a minimum. TruSens doesn't list its devices' CADR ratings publicly, nor could its customer support team provide the ratings when we asked. When we found the CADR numbers in the manuals, we were alarmed. The Z2000 (the "medium room" model), which by TruSens's claimed specs is a direct competitor to our top pick, the Coway AP-1512HH Mighty, has a CADR of 112/117/95 on dust/pollen/smoke—in every case less than half the Coway's CADR ratings, and below those of even our top pick for small rooms, the Levoit Core 300. The Z1000, TruSens's "small room" model, is even weaker. Both models also draw far more power than their supposed equivalents among our picks, and both cost the same or more up front. Finally, the manual for the "large room" Z3000 does not offer CADR numbers, but with a claimed ACH of 2 in a 750-square-foot space, it's barely half as powerful as our large-space pick, the Blue Pure 211+ (3.5 ACH in 750 square feet). Yet it costs far more up front, with a price tag of $400 versus a usual $300 for that Blueair model. On top of the above models, we looked at and dismissed multiple purifiers from the growing crowd of knockoff manufacturers. We are not challenging their claims, though we are skeptical of them. But we do place a premium on manufacturers of long standing, with a record of customer service—and these pop-up manufacturers lack both. Rather than address them individually, we turned them into a poem, as their names (and this isn't an exhaustive list) are quite lyrical: Sumgott, Koios, UNbeaten, Zibrone; 2018 and earlier testsIn 2018, we tested two large-space contenders from Honeywell, the 50250-S and the HPA300. The 50250-S failed our noise tests, registering more than 50 decibels even on its lowest setting (50 decibels is our limit for what we consider "quiet"). It's a popular purifier, with a design that has gone largely unchanged for years, but even many of its adherents acknowledge that noise is an issue. The HPA300 performed very well in our tests but was also extremely loud, topping out at 62 decibels on its highest setting and measuring 53 decibels on the higher of its two medium speeds. It's large and visually intrusive, too, consisting of a black tower almost 2 feet tall, 18 inches deep, and 10 inches wide. And it's fussy to maintain, with three small HEPA filters to replace and a prefilter that you have to Velcro in exactly the right place—otherwise it will prevent the cover from reattaching. This model typically costs only slightly less than our top pick for large spaces, the Blueair Blue Pure 211+, which is a more powerful, more attractive, and quieter machine. We retested our former budget pick, the GermGuardian AC4825. The GermGuardian performed well, but it costs more to maintain than our current budget pick, the Levoit Core 300, because of its higher energy consumption—52 watts on medium, versus the Levoit's 34.6 watts. A budget contender, the Levoit LV-H132 performed poorly in our tests, reducing particulates in our 200-square-foot test room by just 60% on high, in contrast to the 92.6% reduction that our small-space pick, the Levoit Core 300, achieved. The Coway Airmega 300, our previous pick for large spaces, is similar in specs to the Blueair Blue Pure 211+, our current large-space pick, which typically costs much less. We tested two tower-style units in 2017, the Coway AP-1216L and the since-discontinued LG PuriCare AS401WWA1. Despite their decent-to-solid performance, we don't recommend either one. Their small footprints (10 by 8 inches for the Coway, 11 by 11 inches for the LG) belie the fact that they're 32 and 30 inches tall, respectively—as tall as a kitchen counter—and so they take up a huge amount of visual space. You'd never forget that you have a purifier in the room. And at about $400 up front at the time of our review, the LG in particular didn't justify its cost. In 2017, we also tested the Dyson Pure Hot+Cool Link HP02 for particulate performance in the lab and in our real-world New York apartment. It offers two distinct fan functions—diffuse and focused; we tested it on both functions in the lab and in the real world. John Holecek further tested the Hot+Cool Link for VOC removal in the lab, given that Dyson had implemented an upgrade of its VOC filter since our 2016 test of its predecessor. In every case the HP02 delivered disappointing performance relative to our pick. Given its high up-front cost and relatively weak performance, we can't recommend it. In addition to those models, we have reviewed more than 100 purifiers since 2013, testing many of them, including the following: In our 2014 test, the Rabbit Air MinusA2 SPA-700A earned middle-of-the-road marks in performance, cost of ownership, and noise. When we tested the Rowenta PU6020 on particulate filtration, it did not stand out. 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. This purifier is also pricey to buy and to run. Although the Bissell air400 has specs comparable to those of the Coway AP-1512HH, it costs over $100 more at this writing, and it has relatively few reviews on Amazon and on Bissell's own site. The Philips 1000 Series purifiers cost more and have similar or weaker specs compared with our Coway top pick. The GermGuardian CDAP4500 is a small-space unit that usually costs $150—more than our pick in that category, the Levoit Core 300—mostly because it offers Wi-Fi connectivity, which isn't useful or necessary. The Rabbit Air BioGS 2.0 also fails the 4 ACH limit for a standard-size room and costs more than our Coway top pick. The Alen BreatheSmart FIT50 and T500 are specced for standard and budget/small rooms, respectively—but they cost at least twice what our picks in those categories do. The Honeywell HPA200 and HPA204 (black and white versions of the same machine) barely meet our 4 ACH minimum in a 350-square-foot room (with standard 8-foot ceilings), so you'd have to run them on high constantly to get the performance we expect. Hamilton Beach offers no cubic-feet-per-minute or CADR numbers on its 04386A air purifier, so we dismissed it. The Levoit LV-PUR131 has budget specs but costs twice as much as our budget pick. The Oransi OV200 has budget specs, draws as much as 60 watts (our budget pick draws 3.6 on medium) and costs much more than our budget pick. The QuietPure Home Air Purifier offers specs similar to those of our also-great pick for large rooms, the Blueair Blue Pure 211+, but it often costs more. The GermGuardian AC4100 "desktop" air purifier doesn't meet our 4 ACH minimum for small spaces.  |
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