Evaluation of traffic's influence nearby school front doors with low-cost PM2.5 monitoring

Nowadays, in Belgium, traffic and heating systems are the main sources of PM in cities. In Wallonia, the urban planning of the streets near schools is modified to allow area for “kiss and ride”. During school activities, dropping off the children to school slows down the traffic. A lot of parents don't turn off the motor of their vehicles for this short time. This behaviour affects negatively the air quality while children, persons at risk, are present. A PM2.5 measurement campaign on the surrounding of a school located in Arlon was realized with low-cost sensors. The sensors are fixed on the building walls, above the entrance doors. The purpose of this study was to measure the concentration of PM2.5 to which the children are exposed when they access the school.