Seminário: Environmental magnetism - Some examples of monitoring and spatialization of urban pollutions in France and in West Africa

10/05/2018 - 16:30
Auditório 1 do IAG (Rua do Matão, 1226, Cidade Universitária)

O seminário do Departamento de Geofísica será apresentado pela Profa. Melina Macouin (Université Paul-Sabatier, Toulouse, França).

Airborne pollution in dense urban areas is nowadays a subject of major concern. Fine particulate pollution events are ever more frequent and represent not only an environmental and health but also a real economic issue. In urban atmosphere, the so-called PM2.5 (particulate matter < 2.5 μm in diameter) and ultrafine fractions (< 100 nm) due to combustion, causes many adverse health effects. Environmental magnetic studies of airborne PM collected on air filters or plants have demonstrated their potential to follow the metallic pollution.
I will present some examples of magnetic measurements of traffic-related airborne PM in moderate-size cities en France (Toulouse, Paris) and in West Africa (Benin and Cameroun). We made measurements on leaves and bark samples in order to characterize airborne PM as a function of the local urban environment. We also sampled bank sediments to follow the becoming of magnetic particles when they reach the aquatic environment. For examples, in Toulouse and in Paris (France), the results obtained on Platanus bark allow topropose a high spatial resolution mapping (< 10m) along the rivers of magnetic susceptibility and frequency dependent susceptibility.
I will present our current trans-disciplinary project (including sociology and medicine) that focuses the city of Toulouse (France) and that involves participative sciences to include indoor measurements.