Brussels

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

On Thursday February 14th, 230 alder and hazel pollen grains/m³ air were measured.

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.