Several grass species are in bloom.

On Thursday, 39 grass pollen grains per cubic metre of air were measured in Brussels. Airborne pollen amounts may increase during sunny spells. People suffering from hay fever should be vigilant and carefully follow their practitioner’s recommendations.

Large amounts of allergenic fungal spores of the genus Cladosporium are also present in the air. The spore concentration peaks of this mold are very temperature dependent.