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Installing air filters in classrooms has surprisingly large educational benefits

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Kirill Kukhmar\TASS via Getty Images $1,000 can raise a class’s test scores by as much as cutting class size by a third. 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. That’s...

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