2024 Yes Natural ventilation strategy and related issues to prevent coronavirus disease 2019 (COVID-19) airborne transmission in a school building https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8123370/ Park, Sowoo Asia Modeling Elementary (K-5) Ventilation rates Temperature Coronavirus disease 2019 (COVID-19) Airborne transmission Natural ventilation Air change rate (ACH/AER) Infection probability Classrooms Field measurements show cross-ventilation with ≥15% window opening and mask use keeps infection risk <1%. Single-sided ventilation is less effective. Findings support ventilation design for airborne disease control in schools. 2021