Forecast

The birch season is coming to an end and the grass season is just around the corner!

The weather forecast promises plenty of sunshine and temperatures well above 20 degrees for the long weekend. This means ideal conditions for the pollen count. Due to the already very advanced birch blossombirch blossom is already well advanced, we are not expecting peak levels of birch p ollen, but only moderate levels. The grass pollen season has already caused initial exposure in some places, but is still at the beginning. At the weekend, it will also be able to cause a moderate impact. However, in contrast to birch, an increasing trend can be assumed here.

Although the birch pollen count is already declining significantly, the pollen spectrum still contains relevant concentrations of pollen types that cross-react with birch, for example from beech and oak.

Sycamore pollen is only occasionally recorded at the monitoring centres and can only cause relevant pollen counts in the immediate vicinity of large populations.

In the coming days, however, increasing levels of grass pollen are to be expected, which can already reach low concentrations and even moderate concentrations in thermally favoured locations. The main culprits for this are the early-flowering members of this plant family, such as panicle grass, couch grass, tufted grass and foxtail grass.

The white flakes in the air are the seeds and seed hairs of the poplar. Their flight usually coincides with the start of grass flowering, but unlike grass pollen, they cannot cause allergic symptoms.

The rape fields are also in bloom. To avoid possible symptoms, pollen allergy sufferers should avoid being near these fields.

Note: At the moment, a yellowish film of dust can be found on car roofs or window sills. This is pollen from conifers such as spruce, pine and fir trees. From an allergological point of view, it is not relevant. However, as this pollen is present in high concentrations in the ambient air, it can cause mechanical irritation of the conjunctiva and respiratory tract.

People who are sensitised to the pollen of olive trees must continue to expect symptoms in the coming days, which can be traced back to the blossoming of the manna ashbut also to lilacs in the immediate vicinity.

In addition to the pollen types mentioned, ginkgo, mulberry and horse chestnut are also currently sensitised, horse chestnutsour grasses, walnut and cypress plants are represented in the pollen spectrum. However, they only have a very low allergenic potential.

Forecast date: 2026-04-30

Note: The data shown here are model data for the expected start of flowering. For more detailed information on the expected pollen count, please refer to the text forecasts.