2024 No Passive PM2.5 control plan of educational buildings by using airtight improvement technologies in South Korea https://www.sciencedirect.com/science/article/abs/pii/S0304389421019580 Yang, Sungwoong Asia Observational Other Particulate Matter (PM) Dust Particulate matter (PM) School Educational buildings Air-tightness Infiltration Blower door tests in educational buildings showed that applying sealing films, lids, and padding reduced air leakage by 37% and indoor fine dust by 22%. Findings support low-cost airtightness improvements to reduce particulate infiltration. 2021