The next allergenic pollen wave which is expected is the one of grasses. We currently detect steady amounts of grass pollen grains in the air but these are still low.
Dry weather and mild temperatures may result in higher pollen densities.
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The summer snow you can see drifting in the air is not pollen but poplar and willow seeds (white fluffy threads), and also dandelion seeds. This cottony fluff does not cause allergy.
A few useful recommendations for people sensitized to birch pollen :