Michael Gilrane, New York University. This paper identifies the achievement impact of installing air filters in classrooms for the first time.
$1,000 can raise a class’s test scores by as much as cutting class size by a third. By Matthew Yglesias@email@example.com 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