Grasses are still in bloom.

The pollen content of the air strongly fluctuates depending on the weather conditions.

On Thursday, 11 grass pollen grains per m³ were measured in Brussels.

The next expected wave of allergenic pollen is the one of mugwort. This herbaceous plant is often considered as a common weed. Its pollen can be responsible for allergic symptoms in some people.

Currently, the air also carries large quantities of fungal spores of the genus Cladosporium. People sensitized to this mold should take precautions.