Weather

Pollen allergy and hay fever

As soon as the first pollen grains appear again in the air, the dates of beginning and end of the season will be updated in the overview below.

AllergenBeginning of the seasonEnd of the season
Alder28 January 202414 March 2024
Ash13 March 202416 April 2024
Birch18 March 202418 April 2024
Grasses09 May 202424 August 2024
Hazel27 January 202421 February 2024
Mugwort19 July 202426 August 2024
Oak06 April 202417 May 2024

Birch

Alder

Grasses

ColorLevelRisk
NullNo pollen grains are expected in the air. The risk of symptoms is theoretically absent, although very local exposure can trigger allergies.
LowLow concentrations of pollen in the air are expected. For very sensitive people, these few pollen could induce allergy symptoms. The usual avoidance measures are already recommended.
ModerateModerate concentrations of pollen in the air are expected, causing symptoms for people with pollen allergies. The usual avoidance measures are recommended.
HighHigh concentrations of pollen in the air are expected. Many people who are allergic to this pollen are likely to develop symptoms. The usual avoidance measures are recommended.
Very highVery high concentrations of pollen in the air are expected. Most people who are allergic to this pollen are likely to develop symptoms. It is strongly recommended to avoid all outdoor activities.

The information about expected pollen allergies and hay fever is based on the SILAM pollen transport model. The basic model comes from the Finnish Meteorological Institute. In collaboration with Sciensano, the RMI has adapted this model specifically for Belgium. Sciensano's Mycology and Aerobiology department has decades of pollen observations in Belgium and supports the pollen model and pollen allergy risk estimation.

For more information on the allergenic pollens, please visit the website www.airallergy.be of Sciensano.

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