In brief

The season of grasses is in approach. The last few days, small grass pollen amounts have been detected in the air. On Thursday, 6 pollen grains per m³ of air were measured in Brussels. Hayfever sufferers should take their precautions.

Oak and plane trees are also blooming.


Latest measure: 
Thursday, 13 May, 2021
20202021Mean 2011 - 2020threshold valueMayJunJulAug020406080100120140grains / m³


Latest measure: 
Thursday, 13 May, 2021
20202021Mean 2011 - 2020threshold value11 Mar18 Mar25 Mar01 Apr08 Apr15 Apr22 Apr29 Apr06 May13 May0500100015002000250030003500grains / m³

Good to know

  • At the start of the grass pollen season, people highly sensitive to grass pollen may already feel the first symptoms. 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 !