Hazel and alder trees are currently blooming and their allergenic pollen is released in case of dry and sunny weather.

On Thursday, 465 alder and hazel pollen grains/m³ air were measured in Brussels.

Attention: these pollen concentrations are even higher in Genk.

People who are sensitized to this type of pollen should be careful.

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Useful information:

Some people sensitized to birch pollen may experience allergy symptoms when hazel and alder pollen concentrations are high because of immune cross-reactivity between these allergens.