Air Filters: A Guide to Smart—and Not So Smart—Models as Covid-19 and Wildfires Drive Demand – The Wall Street Journal

“Eek, Nicole. Time to close the windows!” screamed Mila.
OK, great, Mila didnt shriek. It didnt say anything. Mila is a portly, Wi-Fi-enabled clever air filter being in the corner of my bed room. She– er, it– sent out the exclamation as a push notification to my phone and explained more in its app: “The AQI is increasing and I cant keep up.”

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