Survey for allergic people

Sciensano researchers are launching a investigation to understand how nitrogen deposition affects people with pollen allergy in Belgium.

As an allergic person, you are invited to participate in the study by answering a questionnaire (20 min maximum). For the survey to run smoothly, participants must be at least 18 years old, live in Belgium, have a pollen allergy (whether medically confirmed or not) and have symptoms of this allergy on the day of the questionnaire.

New forecast maps

Do you want to know the risk of birch pollen allergy expected in the coming days?

The Royal Meteorological Institute (RMI) in collaboration with Sciensano is launching a birch and grass pollen forecast model on its website and app. The forecast maps and explanation of the model are also available on the AirAllergy website:

In brief

The alder and hazel pollen season is gradually coming to an end. However, it is recommended that people who are sensitive to this type of pollen still take the necessary precautions to limit allergy symptoms.

The air also contains pollen emitted by other trees such as ash, willow, poplar, elm and cupressaceae.

The next wave of allergenic pollen is expected from birch.

Alder + Hazel

Latest measure: 
Wednesday, 22 March, 2023
20222023Mean 2013 - 202207 Jan14 Jan21 Jan28 Jan04 Feb11 Feb18 Feb25 Feb04 Mar11 Mar18 Mar25 Mar01 Apr050100150200250300350400450grains / m³


Latest measure: 
Wednesday, 22 March, 2023
20222023Mean 2013 - 2022threshold value11 Mar18 Mar25 Mar01 Apr08 Apr15 Apr22 Apr29 Apr06 May13 May0100200300400500600700800900100011001200grains / m³

Good to know

  • A few useful recommendations: avoid outdoor activities, wear sun glasses, do not dry linen outside, rinse your nose regularly, wash your hair before going to sleep.

  • Typical allergy symptoms such as runny nose, cough or shortness of breath (in case of asthma) can easily be mistaken for a cold, flu or coronavirus infection. However, fever and body aches should be given special attention as they might be caused by viral infection. It is recommended to call your general practitioner in case of doubt.

  • The standardized pollen detection technique allows retrospective measurement of the levels from samples taken the day before. Samples are analyzed manually during the working days by optical microscopy.