“Air purifiers appear to work—sometimes strikingly well. After a gas-leak scare near Los Angeles, the city school district installed air filters in classrooms, and students’ math and English scores shot up, the magnitude roughly on a par with cutting class sizes by a third.”

Dhruv Khullar, assistant professor at Weill Cornell Medical College

Weill Cornell physician says air purifiers appear to work to reduce indoor pollution from wildfires  Source: New Yorker | The Hazy Days of Summer QUOTE