The French Observatory of ragweed has recorded more than 80 events for the International Ragweed Day. Almost half of them took place in the Auvergne – Rhône-Alpes region, the most infested region of France. See details here.

Here is the link to the last newsletter (in French) of the observatory: http://solidarites-sante.gouv.fr/IMG/pdf/lettre_observatoire_53_juillet2018.pdf