Pollen Count
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Pollen Counts in Belgium

Flag of Belgium

Check daily pollen forecasts, the pollen map, seasonal trends, and all the cities we cover in Belgium. Forecasts update every day, so check back regularly during pollen season.

Updated: 6 Oct 2026.

Belgium Pollen Map

This map shows daily forecasts for the cities we cover in Belgium, updated every day.

Belgium's Pollen Seasons

In Belgium, tree pollen arrives in stages. Alder releases pollen in March, followed by birch in April. Birch is the most common pollen type across the year, and April is the busiest month for pollen overall.

Grass pollen season in Belgium is measured in June and July. Olive trees also release pollen in May and June. These seasons overlap in June, so more than one plant group can contribute pollen then.

Weed pollen comes later in the year. Mugwort releases pollen in July, while ragweed season is measured in August and September. Pollen from these plants may affect people with allergies during those months in Belgium.

Pollen Calendar for Belgium

Typical pollen calendar for Belgium, averaged across 27 cities from previous years. Alder peaks in March, Birch peaks in April, Grass peaks in June, Mugwort peaks in July. Use it to see which months each pollen type usually rises and falls.

  Alder Birch Grass Mugwort Olive Ragweed
Jan 1.8 0 0 0 0 0
Feb 45.2 0 0 0 0 0
Mar 454 342.1 0 0 0 0
Apr 2.9 1742.8 12.9 0 0.3 0
May 0.5 72.6 118.1 0 1.6 0
Jun 0 0.2 846.2 53.6 0.4 0
Jul 0 0.2 304.3 333.5 0 0
Aug 0 0 69.2 74 0 1.7
Sep 0 0 5.8 4.5 0 4.5
Oct 0 0 0.3 0.3 0 0
Nov 0 0 0 0 0 0
Dec 0 0 0 0 0 0

Values in gr/m³ (pollen grains per cubic metre), averaged across covered cities. Local microclimates vary. Not medical advice.

Places We Cover in Belgium

We publish forecasts for these cities across Belgium. Check the list to see what is near you, or view them on the Belgium Pollen Map above.

Brussels Capital

Flanders

Other

Wallonia

Pollen information is for education and planning only. This is not medical advice. Consult a qualified healthcare provider about symptoms or treatment.

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