2024 Yes Review and Extension of CO2-Based Methods to Determine Ventilation Rates with Application to School Classrooms https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5334699/ Batterman, Stuart North America Observational Elementary (K-5) Ventilation rates Carbon Dioxide (CO2) Ventilation Air change rate (ACH/AER) Carbon dioxide (CO2) School Classrooms Indoor air quality CO₂-based methods for estimating ventilation rates were evaluated in 4 school buildings. Transient mass balance was most accurate under dynamic occupancy. Findings support improved VR measurement to strengthen research on ventilation and health links. 2017