Associations Between Classroom Carbon Dioxide Concentrations and Student Attendance in Elementary Schools in Washington and Idaho.

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This article is based on a Lawrence Berkeley National Lab report. The study involves CO2 measurements inside and outside the 436 classrooms of 22 schools in Washington and Idaho. According to the authors, In this study, 1,000 [parts-per-million] increases in the difference between indoor and outdoor CO2 concentration were associated with 10 percent to 20 percent relative increases in student absence, and the associations were statistically significant. This study confirms previous findings of high CO2 concentrations in classrooms, which indicated classroom ventilation rates were often below the minimum rates specified in codes. [Authors' abstract]
Shendell, Derek G.; Prill, Richard
Indoor Air Quality in Northwest Schools
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