The Z1000, TruSens’s “small room” model, is even weaker. On medium, where it produces a sleep-friendly 43.2 decibels, it achieved an impressive 92.6% reduction. Winix says these “can help to reduce the presence of airborne bacteria and viruses,” but we consider that a moot point, since HEPA filters already capture virtually all bacteria and viruses. One is noise output, and there the Winix 5500-2 is similar to the Coway AP-1512HH. No air purifier can do anything about allergens, bacteria, or viruses that have settled on furniture and other surfaces. 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. HEPA filtration is a physical process, but it’s not like what most of us envision when we think of a filter: a net, or a colander, or maybe mosquito netting, where particles larger than the holes get caught and the rest passes through. Other criteria also matter. 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. Our air purifier review identified the Philips AC3256/30 anti-allergen air purifier as the best choice. It has a HEPA filter – designed to last three to six months, depending on usage – and an ionisation option. 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. And like the Mighty, the Airmega 200M has a display-shutoff feature that lets you dim its lights, something we value highly for bedroom use. It has delivered exceptional air purification at the 0.3 micron HEPA standard in our testing. One trend we’ve encountered in the scant negative reviews of the Coway Mighty concerns complaints about nonresponsive customer service. 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. (Human hair, for reference, is usually between 20 and 180 microns across.) 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. In its advice on cleaning and disinfecting homes during the pandemic, the CDC recognizes as much: “When used properly, air purifiers can help reduce airborne contaminants, including viruses, in a home or confined space.” And in its guidance for health-care personnel, the CDC states that air from rooms where COVID-19 patients are being isolated “should be exhausted directly to the outside or be filtered through a high-efficiency particulate air (HEPA) filter directly before recirculation,” and advises health-care workers to “consider the addition of portable solutions (e.g., portable HEPA filtration units) to augment air quality in areas when permanent air-handling systems are not a feasible option.”. And at that speed, the Mini’s performance on particulate removal tanked: It cut the match smoke by just 63.3% in 30 minutes. Renpho, Aviano, Mooka, Keenstone; 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. Read more in What can an air purifier do for you? HEPA air purifiers do one thing and do it very well: remove fine particles from the air. 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. We recommend both just as highly. On the medium setting, it draws just 8.1 watts, so running it 24/7 on that setting consumes just 71 kilowatts annually. Its Auto function, introduced to the Blue Pure lineup in late 2020, monitors your room’s air quality and adjusts the fan speed accordingly. If you prefer the Airmega 200M’s looks or if you find it at a better price, we recommend it just as highly. 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