In brief

Grasses are still in bloom.

The pollen content of the air strongly fluctuates depending on the weather conditions.

On Thursday, 11 grass pollen grains per m³ were measured in Brussels.

The next expected wave of allergenic pollen is the one of mugwort. This herbaceous plant is often considered as a common weed. Its pollen can be responsible for allergic symptoms in some people.

Currently, the air also carries large quantities of fungal spores of the genus Cladosporium. People sensitized to this mold should take precautions.


Latest measure: 
Thursday, 22 July, 2021
20202021Mean 2011 - 2020threshold valueMayJunJulAug020406080100120140160180200220240260280grains / m³


Latest measure: 
Thursday, 22 July, 2021
20202021Mean 2011 - 2020threshold valueMayJunJulAugSepOctNov0200040006000800010000120001400016000180002000022000240002600028000fungal spores / 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 !