Participatory science at school: The Black Carbon educational experiment

Black carbon (BC), also known as soot, is a fine particulate matter consisting of carbon particles produced from incomplete combustion of carbon-based fuels. BC contributes significantly to the air quality degradation and has various environmental impacts. BC is a short-lived climate agent and contributes to global warming.

Measuring BC using citizen science involves simple but precise methods to estimate its presence in the environment. The Black Carbon EDUcational program (BC-EDU) is an initiative supported by the Caliph'air project. Calisph’Air is an outreach activity of the Centre National d’Etudes Spatiales in the frame of the CALIPSO space research program. BC-EDU actively involves middle school teachers and students. The BC-EDU serves as an educational tool, raising students' awareness of pollution issues by studying soot particles in the ambient atmosphere.

BC atmospheric concentrations are measured daily using a light absorption technique on air filters thanks to a small aethalometer specifically designed for the students (manufactured by Staneo). The total BC deposit on the air filters is finally analyzed using a thermo-optical method (Sunset OC/EC analyzer).

We present the campaigns carried out with 8 middle schools in 2018 and new experimentations on indoor and outdoor BC concentrations in 2024 in France. We evaluate the students and teachers engagement in such a research-led initiative and the impact of crowd-based BC monitoring for understanding BC sources and transport in and around middle schools.