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How can increased ventilation rates increase school district income?

“Overall, the available research indicates that increased ventilation rates in classrooms are associated with reduced student absence. For elementary and middle school students, reduced student absence has been shown to be associated with higher grade point averages and higher scores in academic achievement tests.”

“In offices, even very small decreases in absence rates from increases in ventilation rates would be financially significant … In some school districts, income from government sources is linked to days of student attendance; thus, increased ventilation rates may increase school district income. “

Source: Berkeley National Laboratory Indoor Air Quality Scientific Findings Resource Bank (IAQ-SFRB)