2015 No https://doi.org/10.1039/c4em00702f Seo, SungChul Asia Observational Exposure Study Students Elementary (K-5) Temperature Humidity Particulate Matter (PM) Fungi Study of 70 classrooms in eight South Korean elementary schools measured submicron fungal fragments before and after rainy season; indoor levels were higher than outdoor, and levels decreased after rain. Highlights need for seasonal monitoring and improved understanding to guide school health management.