The Ventilation Problem in Schools: Literature Review

This report presents a comprehensive review and analysis of research on ventilation rates in U.S. schools and the implications of inadequate ventilation for student health, academic performance, and energy use. Drawing on over 70 studies, the authors conclude that ventilation in U.S. classrooms is frequently below minimum recommended rates, including those set by ASHRAE and state standards. Many classrooms have ventilation rates that are less than half of the recommended values, resulting in elevated carbon dioxide concentrations and increased exposure to indoor pollutants. The report emphasizes that poor ventilation is widespread across the country and is particularly problematic in older buildings and under-resourced districts.
The authors summarize strong evidence linking insufficient ventilation with increased illness, student absenteeism, and reduced academic performance. For example, higher outdoor air ventilation rates have been associated with improvements in task performance and standardized test scores, while low ventilation rates correlate with greater student absences. The report also presents an economic perspective, noting that the cost of improving ventilation is modest compared to the potential benefits in health and learning outcomes. Although higher ventilation rates may lead to increased energy use, the authors argue that these costs can be mitigated through energy-efficient strategies, such as heat recovery and demand-controlled ventilation.
This resource is valuable for school administrators, facilities managers, and policymakers seeking a clear, evidence-based rationale for investing in ventilation upgrades. It provides both a scientific foundation and a policy-oriented perspective to support actions that improve indoor air quality in schools.