Seasonal allergic rhinitis, or hay fever, is triggered by an excessive reaction by the body to an allergen: pollen. It occurs every year in the same period, at the time when the pollen to which the person is allergic is at its highest air-borne level(1).
THE DIFFERENT POLLENS
There are a large number of different pollens which are present in variable quantities depending on the seasons/periods and according to the regions in France. The French National Network for Aerobiological Monitoring has created a pollen calendar, which records each and every pollen.(2)
The trees with the highest allergenic potential are:
The most allergenic plants in the grass family are:
The pollen calendar in France for the key allergens
Click on the map to enlarge the image.
La rhinite et conjonctivite allergiques de l’adulte Juin 2008 (Allergic rhinitis and conjunctivitis in adults,