2024 Yes Survey and Measurements of Indoor Environmental Quality in Urban/Rural Schools Located in Romania https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9407740/ Catalina, Tiberiu Europe Observational Modeling Students Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Temperature Humidity Carbon Dioxide (CO2) Indoor environmental quality School buildings Survey A survey of 790 students found IEQ issues in schools, especially in rural buildings. Urban schools had better winter thermal comfort due to upgrades, but city schools faced higher CO2 and PM levels. Ventilation and heating were key concerns overall. 2022