Situation and medium-term forecast for

Issued on April 12, 2024

The birch has exceeded its flowering peak, first relevant stress from grasses!

Due to the unusually high temperatures in eastern Austria and especially in urban areas, the start of flowering and the flowering sequence of the plants has generally been pushed forward by several weeks. This also results in an accelerated flowering sequence and unusually strong fluctuations in stress levels. In Vienna and the surrounding area, the birch season has already passed its peak and the majority of trees are already in the final stages of pollination. Only the late-dusting representatives of the birch trees are still pollinating, so the birch season is coming to an end. At the same time, however, the grass season is beginning in the Vienna Basin and in inner-city areas with noticeable symptoms.
In most cases, the harmless poplar cottonwood is also found on the ground right at the beginning of the grass season and is wrongly blamed for the symptoms that are now occurring. In this case, the grasses are usually responsible for the symptoms.
In the inner city, plane trees and walnut trees are in full bloom, and the stresses that until recently were characterized by ash and hornbeam are now being caused by beech and oak. Cross-reactions between beech and oak can intensify the symptoms of birch pollen allergy sufferers.
Willows and maple are also in bloom, but their pollen is of little allergological significance.
The brisk winds forecast for the weekend can lead to an increased pollen load as the air currents can cause already sedimented pollen to re-enter the air and transport allergens from the surrounding area into the city center.

We expect the grasses to start flowering across the board in Vienna's inner city on 23.04.2024 and in the outlying districts around 25.4.2024!


Erste Gräser © Johannes Bouchal

Responsible for the content

AZ Pollenresearch GmbH
im Auftrag des Vereins Österreichischer Polleninformationsdienst in Kooperation mit der GeoSphere Austria.
Dr. med. Markus Berger und Dr. rer. nat. Johannes M. Bouchal.

Wetterdaten und Prognosen basierend auf synoptischen Daten:
GeoSphere Austria, Bundesanstalt für Geologie, Geophysik, Klimatologie und Meteorologie (ehemals ZAMG).
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