Pollen Forecast Brussels — August 17, 2026
Live pollen levels for hay fever and allergy sufferers in Brussels, Belgium
Today's Pollen Levels in Brussels
Today's Forecast Conditions
Pollen is present but at low levels in Brussels on August 17, 2026. The majority of hay fever sufferers should manage well without medication.
Outdoor activities are generally fine today. Mildly sensitive individuals may notice light symptoms in the afternoon as temperatures rise. Keep antihistamines handy if you react to very low thresholds.
7-Day Pollen Forecast for Brussels
Pollen Season in Brussels
Brussels occupies a transitional zone between the Atlantic maritime climate of the North Sea coast and the more continental conditions of the Ardennes, giving its pollen season elements of both regions. Alder along the canal network and the Senne valley opens the season in late February. The Forêt de Soignes, a beech forest with scattered birch at Brussels' southern edge, contributes significantly to the April birch season. Grass pollen from Belgian and Walloon meadowlands dominates May through late July, with the Bois de la Cambre and Laeken Park providing local hotspots. As the seat of EU institutions, Brussels has a transient international population that may have different allergy profiles from their home countries. Belgium's maritime climate means frequent rainfall provides periodic relief, but post-rain pollen bursts can cause abrupt symptom spikes. Around 20% of Brussels residents have allergic rhinitis.
- The Forêt de Soignes is a major birch source in April — running or cycling the forest trails during peak birch bloom is inadvisable for sensitised individuals.
- Post-rain days in Brussels can trigger pollen bursts as stored pollen is released — symptoms may worsen the afternoon after overnight rain.
- EU Quarter outdoor events in May and June coincide with grass peak; those attending outdoor summits or events should carry antihistamines.
Frequently Asked Questions
What is the pollen count in Brussels today?
Today, August 17, 2026, the dominant pollen in Brussels is Mugwort at Low levels. The maximum recorded value is 6.0 grains/m³. PollenPal updates this data daily.
When is hay fever season in Brussels?
The main hay fever season in Brussels runs from April to June. Tree pollens (birch, alder) typically start the season, followed by grass pollen which is the most common allergen trigger. Mugwort and other weeds can extend symptoms into late summer.
What pollen is high in Brussels right now?
As of August 17, 2026, the highest pollen type in Brussels is Mugwort (Low). You can track all four pollen types — birch, grass, alder, and mugwort — on this page, updated every day.
Is birch pollen high in Brussels today?
Birch pollen in Brussels today (August 17, 2026) is at Low levels (0.0 grains/m³). Birch season in Brussels typically peaks in spring. For personalised birch pollen alerts, download the PollenPal app.
How do I reduce hay fever symptoms in Brussels?
To reduce hay fever symptoms in Brussels: check the daily pollen forecast and take antihistamines before heading outside on high-count days. Wear wrap-around sunglasses, shower after spending time outdoors, and keep windows closed during peak hours (11:00–16:00). The PollenPal app provides hourly pollen forecasts and personalised alerts for Brussels and other European cities.