Forecast

The birch pollen season is starting to wind down!

Despite the fact that many birch trees in Vienna are already shedding their catkins, moderately high pollen concentrations can still be expected for the rest of the week. In general, however, a decreasing trend can already be recognised.

However, as many other birch plants are also currently in flower, cross-reactions may still occur. The main culprits are currently beech and oak. Pollen grains from grove- and hop hornbeam can still be found in the air, but much less frequently than in previous weeks.

The plane tree will also continue to cause relevant pollen counts in the coming days. Particularly along avenues of plane trees or in parks where there are many of these trees, pollution must still be expected.

Also ash pollen was again registered in the air. This exposure is due to the manna ash trees, which are currently in bloom, and can again lead to symptoms in people who are sensitised to the pollen of the olive trees. Similar to the lilac, which is also in flower, the mannaash is a plant that is mainly pollinated by insects. As a result, its pollen can usually only be found in the air in relevant concentrations in the immediate vicinity of the plants.

The first rapeseed fields are in bloom in the area surrounding Vienna. In order to avoid possible symptoms, pollen allergy sufferers should avoid being near these fields.

Poplar cotton wool is already flying in thermally favoured locations. The white flakes cannot trigger allergic symptoms as they are not pollen, but seeds and seed hairs of the poplar are involved. As the flight of poplar cotton wool usually coincides with the start of the grass flowering the start of grass flowering, symptoms are often wrongly attributed to the poplar.

It still takes until the beginning of May before the grasses are ready to flower across the board. In some locations in eastern Austria, however, the first flowering panicle grasses, foxtail grasses and tussock grasses have already been sighted, which can lead to the first minor complaints locally. These can be further intensified by the first flowering representatives of plantain in the meadow aspect.

In addition to the pollen types mentioned above maple, larchmulberry, horse chestnut, sour grasses, walnut and cypress plants are represented in the pollen spectrum. However, they only have a very low allergenic potential.

Forecast date: 2026-04-23

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.