2024 No On the seasonal aerosol pollution levels and its sources in some primary schools in Vilnius, Lithuania https://pubmed.ncbi.nlm.nih.gov/32080817/ Prokopciuk, Nina Europe Experimental Elementary (K-5) Particulate Matter (PM) Primary schools Indoor/outdoor aerosol Pollution levels Systematic sources Occasional sources Ventilation In 11 Lithuanian primary schools, indoor aerosol particle levels were influenced by canteens without ventilation, student activity, furniture, outdoor pollution, and occasional sources like construction and landscaping, highlighting diverse indoor pollution origins. 2020