Investigation of the Exposure of Schoolchildren to Ultrafine Particles (PM) during the COVID-19 Pandemic in a Medium-Sized City in Indonesia.

The health risk of schoolchildren who were exposed to airborne fine and ultrafine particles (PM) during the COVID-19 pandemic in the Jambi City (a medium-sized city in Sumatra Island), Indonesia was examined. A questionnaire survey was used to collect information on schoolchildren from selected schools and involved information on personal profiles; living conditions; daily activities and health status. Size-segregated ambient particulate matter (PM) in school environments was collected over a period of 24 h on weekdays and the weekend.