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While theres no display screen, a discreet LED stripe above the button provides quick feedback

Pros Superior levels of filtration Can protect from viruses and bacteria Cons Expensive Not energy efficient Recommended Use: Hospitals & Laboratories Filters rated between 14-20 are typically only used in hospitals and laboratories, where air needs to be as clean as possible

How we tested The tools: Since 2016, weve conducted dozens of real-world purifier tests, measuring particle concentrations with a TSI AeroTrak 9306 a professional, high-precision particle counter commonly used to certify air quality to OSHA standards in factories and other workplaces

Its shocking, said Councilmember Christina Henderson (D-At Large)