Situation and medium-term forecast for

Issued 15th of April 2021

Situation and medium-term forecast

Unfavorable weather conditions still reduce allergenic burden!

Also, the second half of the week will be dominated by unexpected low temperatures. Only in Western and Southern Austria sunny weather is expected for Saturday and Sunday. Which may result in increased allergenic burden. For all other regions rainy weather and low temperatures will not allow increased pollination.

Moderate to high burden caused by birch pollen has to be expected in the above mentioned climatically favored regions whereas in the remaining areas of the country only moderate burden has to be expected. Despite the fact that some plants already depleted their flowering potential a second peak of the birch pollen season is expected once higher temperatures are reached.

Hornbeam, hop hornbeam and oak are flowering as well and may increase the allergenic burden for birch pollen allergy sufferers due to cross reaction.

Ash already passed its peak pollination period in the lowlands. Depending on the weather conditions moderate burden still has to be expected.

The plane tree flowers. A burden from plane tree pollen has to be expected in urban areas particularly in avenues of plane trees.

The forecast data for the next phase of the pollen season, the readiness to flower for grasses, indicate a start for the mid of May. This indicates an average start of the grass pollen season from a current point of view.

What else: The pollen spectrum contains pollen from yews, cypresses, poplar, maple, willow and walnut in addition, which is of a low allergological importance.


We expect the readiness to flower for grasses inon
St. Pölten10.05.2021

Forecast from 15.04.2021
Note: The model results give an indication of the expected start of flowering, based on information provided by local pollen warning services with direct reference to the local situation. Readiness to flowering is not equal to the beginning of the pollen season. When the start of flowering is achieved, most of the plants can release pollen, but only when weather conditions are favourable.

Responsible for the content: and the Department of Oto-Rhino-Laryngology of the Medical University Vienna, Research group aerobiology and pollen information
Uwe E. Berger MBA, Mag. Maximilian Bastl PhD and Mag. Dr. Johannes Bouchal
medium-term forecast based on model and pollen data from Austria and surrounding countries
reprint and publication in parts or completely is permitted only quoting the source

weather data and today´s forecasts based synoptic data: ZAMG (Zentralanstalt für Meteorologie und Geodynamik)
zum Team

The current pollen load for Austria

Legende: 1 = Low, 2 = Moderate, 3 = High, 4 = Very High

ash (Fraxinus)

Friday, 16. April
Saturday, 17. April
Sunday, 18. April

birch (Betula)

Friday, 16. April
Saturday, 17. April
Sunday, 18. April

alder (Alnus)

Friday, 16. April
Saturday, 17. April
Sunday, 18. April
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