Situation and medium-term forecast for

Issued 8th of April 2021

Situation and medium-term forecast

The weather-related relief for pollen allergy sufferers ends in the next days!

Cold and rainy weather during the past days resulted in a significantly reduced amount of pollen in the air. The forecasted warm temperatures and dry weather conditions for the next days will lead to increased pollination.

The majority of birch trees already reached readiness to flower, but pollination was prevented due to the unfavorable weather conditions. With the expected temperature rise also a rapid increase in allergenic burden has to be expected. Therefore, the first peak pollination period with very high burden can be expected in some regions. Due to an extremely intense birch pollen season in the past year, this year only an average or below average intensity is expected. So, this peak pollination period will not take as long as in the past year.

The hornbeam is now flowering as well and may increase burden for birch pollen allergy sufferers due to cross reaction. This is also the case for hop hornbeam, but this tree is restricted to our southern neighboring countries and its pollen reaches Austria only by long distance transport.

In Eastern Austria the ash pollen season already passed its peak whereas this part of the season is expected for the following days in the western parts of the country. High burden must be expected in these areas.

Flowering hazel and alder are now restricted to higher elevations where still low burden has to be expected.

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


We expect the readiness to flower for birch inon
Viennaready to flower
Eisenstadtready to flower
St. Pöltenready to flower
Linzready to flower
Salzburgready to flower
Innsbruckready to flower
Bregenzready to flower
Grazready to flower
Klagenfurtready to flower
Bolzanoready to flower
Munichready to flower

Forecast from 08.04.2021
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

birch (Betula)

Saturday, 10. April
Sunday, 11. April
Monday, 12. April

ash (Fraxinus)

Saturday, 10. April
Sunday, 11. April
Monday, 12. April

alder (Alnus)

Saturday, 10. April
Sunday, 11. April
Monday, 12. April
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