2021 No 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 Particulate matter (PM) As a result of the experiment, it was analyzed that air leakage was reduced by up to 37% and fine dust by 22%.