High season for grasses

We are currently in a very high risk period for hay fever. People who are allergic to grass pollen should take all precautions and strictly follow their doctor's treatment.

In brief

Grasses are in full bloom.

On Thursday, 225 grass pollen grains per m³ of air were measured in Brussels.

The weather conditions are currently very favorable to pollen dispersal in the air.


Latest measure: 
Thursday, 10 June, 2021
20202021Mean 2011 - 2020threshold valueMayJunJulAug020406080100120140160180200220240260grains / m³

Good to know

  • We advise hay fever sufferers to follow the recommendations of their medical doctor and to take some precautions: to regularly shower and wash your hair, to not dry your linen outside, to use paper handkerchiefs so they can be thrown away, to avoid mowing the lawn yourself.
  • 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.
  • Follow us too on Twitter @AirAllergy !