The severity of the allergic reaction to pollen varies from person to person according to:

  • the immune system of the sensitized person which reacts in different degrees to the allergen
  • the type of pollen to which the person is allergic
  • the intensity of the pollen season.

Pollen allergy in Belgium

According to Sciensano:

  • an estimated 10% of Belgians are allergic to tree pollen from the Betulaceae family (birch, hazel, alder and hornbeam)
  • an estimated 18% of Belgians are allergic to grass pollen.



The Belgian aerobiological surveillance network “Airallergy” quickly informs general practitioners, specialists, pharmaceutical firms and the general population of the presence of allergens in the air.

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