2021 No https://doi.org/10.1111/ina.12998 Sanguinetti, Angela North America Observational Teachers Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Ventilation rates Temperature Carbon Dioxide (CO2) Air quality Classrooms Occupant perceptions Thermal comfort Surveyed 84 teachers in 11 California schools and paired results with IEQ monitoring; found teachers misunderstood ventilation systems and could not reliably perceive under-ventilation, highlighting the need for CO₂ monitoring and staff training to ensure safe classroom conditions during COVID-19.