2022 Yes 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 Optimal thermal comfort is not met during the cold season in any of the schools under investigation. The old rural schools were found to be the worst performing buildings compared to urban schools where due to recent investments in refurbishment the winter thermal comfort was enhanced. During the study, it was observed that one of the major IAQ problems consisted in elevated levels of CO2 or particulate matter especially for the schools situated in the city. Noise was reported as an issue only for the schools situated next to national roads while visual comfort was found to be acceptable for more than 94% of respondents from all regions.