EcorçAir offers city dwellers the opportunity to participate in the construction of a fine particle pollution map in their city, village or neighbourhood.

This project follows on from a study already carried out in Paris by the Institut de Physique du Globe de Paris, Sorbonne University and the Ecole des Mines.

The magnetic properties of fine metallic particles are used to measure the quantities deposited on the trunks of Platanes.

Citizens are invited to take samples of plane tree bark between mid-February and mid-March, the period when these trees renew their bark. This makes it easier to collect the bark and to see the accumulation of particles over a year.

To participate, turn a freezer bag inside out and use it like a glove to take several samples of plane tree bark between 1.30 and 1.70m high. Fill in the field sheet and put it in the bag. Repeat with as many plane trees as you like and send your samples to the Institut de Physique du Globe de Paris (indicating the project « EcorçAir ») where they will be analysed.

Feedback will be given to each participant on the measurements made on these samples, and pollution maps will be produced and available online.