New app AirAllergy

AirAllergy launches its new mobile app! Follow pollen levels in real time, consult daily readings and RMI forecast maps for the coming days.

In brief

The very first hazel pollen grains (Corylus) have been detected sporadically in the air in Brussels. This early occurrence can be explained by the premature flowering of a few well-exposed trees, encouraged by the mild temperatures observed since November.

At this stage, despite these limited local emissions, concentrations remain extremely low and do not allow the start of the pollen season to be considered. Regular monitoring across all stations in the network will resume at the beginning of January.

Basidiospores

Latest measure: 
Wednesday, 26 November, 2025
2025Mean 2016 - 2025JulAugSepOctNov0100020003000400050006000700080009000100001100012000fungal spores / m³

Cladosporium

Latest measure: 
Wednesday, 26 November, 2025
2025Mean 2016 - 2025threshold valueMayJunJulAugSepOctNov0200040006000800010000120001400016000fungal spores / 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.