In several regions of France, volunteers observe nature and alert online as soon as they see pollen appear. Almost all French departments are now on red alert for pollen allergy.
Volunteers observe flowers, trees around their homes and immediately launch a pollen alert, much faster than traditional sensors. The information is then sent in real time to those who have registered on the site, whereas traditional sensors to measure pollen levels in the air usually transmit their results with a one-week delay. Enough to allow severe allergy sufferers to start their treatment as early as possible.