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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).

Not all pollens cause allergic reactions and some have a higher allergenic potential than others. To cause an allergic reaction, they must come into contact with the mucosa of the nose, mouth or eyes of the allergic individual. This requires them to be produced in large quantities and to be carried by the wind, to be very small and to have a high allergenising capacity.

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:

Cyprès

Cypress

Bouleau

Birch

Chêne

Oak

Platane

Plane

The most allergenic plants in the grass family are:

Graminées

Grassen

Ambroisie

Ragweed

The pollen calendar in France for the key allergens

® RNSA 2013
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Calendrier pollinique du bouleau
Calendrier pollinique du chêne
Calendrier pollinique du cyprès
Calendrier pollinique du platane
Calendrier pollinique des graminées
Calendrier pollinique de l'ambroisie

Click on the map to enlarge the image.

Calendrier pollinique du bouleau
Birch
Calendrier pollinique du chêne
Oak
Calendrier pollinique du cyprès
Cypress
Calendrier pollinique du platane
Plane
Calendrier pollinique des graminées
Grassen
Calendrier pollinique de l'ambroisie
Ragweed

(1) Bien vous soigner avec des médicaments disponibles sans ordonnance (Using non-prescription medicines correctly).
La rhinite et conjonctivite allergiques de l’adulte Juin 2008 (Allergic rhinitis and conjunctivitis in adults,
June 2008).
(2) www.pollens.fr