Air Filters: A Guide to Smart---and Not So Smart---Models as Covid-19 and Wildfires Drive Demand

“Eek, Nicole. Time to close the windows!” shrieked Mila.

OK, fine, Mila didn’t shriek. It didn’t say anything at all. Mila is a portly, Wi-Fi-enabled smart air filter sitting in the corner of my bedroom. She—er, it—sent the exclamation as a push notification to my phone and explained more in its app: “The AQI is rising and I can’t keep up.”

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Source:" WSJ "

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