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Installing air filters in classrooms has surprisingly large educational benefits


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An emergency situation that turned out to be mostly a false alarm led a lot of schools in Los Angeles to install air filters, and something strange happened: Test scores went up. By a lot. And the gains were sustained in the subsequent year rather than fading away.

https://www.vox.com/2020/1/8/21051869/indoor-air-pollution-student-achievement

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