Situation and medium-term forecast for

Issued 17th of May 2021

Situation and medium-term forecast

Unfavorable weather conditions result in low allergenic burden!

The weather forecast for this week predicts a mix of rain and sunshine all across the country. Therefore, allergenic burden is expected to be varying as well. During longer dry periods increasing burden has to be expected.

Currently, the early flowering grasses like foxtail grass are in full bloom. Moreover, meadow grass and orchard grass are reaching readiness to flower as well. Due to the instable weather conditions only low to moderate burden is expected for the upcoming week. Only at climatically favored regions burden can rise to higher levels.

Note: The immune system of a pollen allergy sufferer may be particularly sensitive at the start of the grass pollen season. Therefore, intense allergenic burden can be expected even during unfavorable weather conditions.

Dock and plantain are flowering and may cause increased allergenic burden as well.

At higher altitudes the green alder is still flowering and causing allergenic burden. Depending on the wind direction pollen can be transported into the valleys and lowlands and may cause allergenic burden there as well.

The birch pollen season is ending. Allergenic burden is now resulting either from long distance transport of birch pollen from Northern Europe or from oak or beech pollen due to cross reaction.

The flowering period of Manna-Ash has passed its peak. In difference to the common ash, this cultivated species from the Mediterranean is insect pollinated and therefore not responsible for such high pollen concentrations. Due to long distance transport from Austria’s southern neighboring countries still some allergenic burden has to be expected for ash pollen allergy sufferers.

The plane tree pollen season is ending, and the pollen concentrations will not rise to levels that cause allergic symptoms.

Currently flowering rapeseed fields should be avoided by concerned pollen allergy sufferers.

Yellow sediment can be found on water surfaces, smooth surfaces and windowpanes. This sediment derives now from conifer pollen (pine, spruce), which may be annoying, but does not cause an allergic burden.

What else: The pollen spectrum contains pollen from, horse chestnut, yews, cypresses, sedges, walnut, mulberry, rose family, willow and elder in addition, which is of a low allergological importance.


We expect the readiness to flower for grasses inon
Viennaready to flower
Eisenstadtready to flower
St. Pöltenready to flower
Linzready to flower
Innsbruckready to flower
Grazready to flower
Klagenfurtready to flower
Bolzanoready to flower

Forecast from 17.05.2021
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

plane tree (Platanus)

Monday, 17. May
Tuesday, 18. May
Wednesday, 19. May

ash (Fraxinus)

Monday, 17. May
Tuesday, 18. May
Wednesday, 19. May

birch (Betula)

Monday, 17. May
Tuesday, 18. May
Wednesday, 19. May
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