RT info:eu-repo/semantics/article T1 Indoor Air Quality in Naturally Ventilated Classrooms. Lessons Learned from a Case Study in a COVID-19 Scenario A1 Meiss Rodríguez, Alberto A1 Jimeno Merino, Héctor A1 Poza Casado, Irene A1 Llorente Álvarez, Alfredo A1 Padilla Marcos, Miguel Ángel AB This paper describes the implementation of a series of ventilation strategies in a nursery and primary school from September 2020, when the government decided to resume the students’ face-to-face activity in the middle of a COVID scenario. Air quality and hygrothermal comfort conditions were analysed before the pandemic and compared for different ventilation configurations in a post-COVID scenario. Ventilation strategies included the protocols issued by the Public Administration, while others were developed based on the typological configuration and use of the school. Results revealed that it is advisable to implement certain strategies that reduce the risk of infection among the occupants of the spaces, without a significant decrease in hygrothermal comfort. Given the importance of maintaining better IAQ in the future within classrooms, and regarding the pre-COVID situation, these strategies may be extended beyond this pandemic period, through a simple protocol and necessary didactic package to be assumed by both teachers and students of the centre. PB MDPI YR 2021 FD 2021 LK https://uvadoc.uva.es/handle/10324/76321 UL https://uvadoc.uva.es/handle/10324/76321 LA spa NO Sustainability, Julio 2021, vol. 13, n. 15, 8446 DS UVaDOC RD 23-jul-2025