The spread of ragweed in the Lyon region and Rhône valley has lead two associations regarding this problem: Association Française d'Etudes Des Ambroisies (AFEDA) and Groupement d'Allergologie et d'Immunologie Clinique du Rhône-Moyen (GAICRM) to join their competences and create a new group: Surveillance Aéropalynologique Rhône-Alpes (SARA). SARA manages six pollen traps in the Lyon area and central Rhône valley and has set up an original and effective information network.