We provide here pollen forecasts and recommendations, that are based on our scientifically evaluated data and our expertise. It is our aim to inform persons concerned by pollen allergies in Vienna in a most comprehensive, accurate way and free of charge.
Video Highlight: Start of the autumn flower of Artemisia 2026
After activation, data will be sent to YouTube. Further information here: Data protection
Annual mugwort (Artemisia annua) and Chinese mugwort (Artemisia verlotiorum) cause only since recently a second phase in pollination in some years.
The native common mugwort (Artemisia vulgaris) flowers much earlier, namely in summer from July to August.
Pollen of annual mugwort is a recognized as important aeroallergen in China. Officially described allergens are known for this species (Art an 1-4, Art an 7 und 14). In contrast, officially described allergens are not yet known for Chinese wormwood. A comparable high allergenicity like for common mugwort is assumed for both neophytes.
Current pollination
LEGEND
Due to current cause:
The weed pollen season expires: the flower of ragweed (Ambrosia) fades; the second flowering phase of Artemisia (mugwort/wormwood) due to neophytes continues.
We provide this convenient overview graph to visualize pollination during the calendar year besides our pollen calendars.
You find more about this seasonal overview here.
Copyright: MedUni Vienna, www.pollenservice.wien
Figure: recent flower development of annual mugwort (Artemisia annua), the inflorescences show more open flowers in comparison to the week before.
Mid- and long-term forecast for Vienna
This forecast gives you an overview for a longer time period so that you can improve your planning.
The weed pollen season ends soon: onset of the autumn flower of mugwort; ragweed pollen season is fading!
Mugwort pollen is an issue due to the autumn flower of the neophytic species.
Good news: Mugwort pollen is only in low concentrations in the air up to now. The plants have not progressed far enough for their main flower. Annual mugwort (Artemisia annua) and Chinese wormwood (Artemisia verlotiorum) are the two species that flower that late. Both are neophytes and have experienced a progress in flower development due to the mild weather (see Figure). Pollination has to be expected locally in the vicinity of flowering plants.
Background: the autumn flower of mugwort occurred for the first time in 2023. It is caused by the neophytes annual mugwort and Chinese wormwood (see Figure). They profit from a mild autumn.
Ragweed pollen occurs only in low concentrations in the air. This is an extension of the fading ragweed pollen season: high values occurred a considerable time ago and the plants faded to flower in majority. The flower of ragweed fades in general also in Europe which makes significant long distance transport of ragweed pollen unlikely.
Fungal spores occur again in high concentrations in the air. Spore concentrations are dominated by Cladosporium and Alternaria spores in the air. However, due to the prolonged dry weather, the fungal spore season was below average this year up to now.
Pollination profile
Mugwort/wormwood:
state of the flower: begin of the second pollination period/pollination
trend: constant
time of the start of the flower: average
Ragweed:
state of the flower: end of the main pollination period/pollination
trend: decreasing
time of the start of the flower: later than average
Fungal spores:
state of the season: end of the main period/high spore concentrations
trend: constant
time of the start of the season: average
You can find the typical pollen seasons in our pollen calendar.
Pollen spectrum:
Pollen from cedar, ivy, mercury, the goosefoot family and the nettle family is also in the air.
Updated on: 1st of October 2026
Current main allergen: Fungal spores
Exposure time in Vienna: May to October
Occurrence in Vienna: The molds in focus here thrive on vegetation. This ranges from potting soil to grain fields. Note: The concentration of fungal spores outdoor has nothing to do with the occurrence of molds indoors.
Who are “the fungal spores“?
The spores of the molds Alternaria and Cladosporium are of allergological importance, especially the former. The here discussed fungal spores are the most important ones for ambient air. There is a high diversity of molds, that are present indoors and can spread on food. Molds may cause allergies, but also toxic reactions escalating to mycosis (invasion of the inner organs).
Alternaria belongs to the blackness-fungi. It grows primarily on vegetation and causes plant diseases that can result in crop failures (fruit, cereals). Persons concerned should not mow the lawn, since it is often located on dry plants. However, Alternaria is also found in the living area.
Cladosporium belongs as well to the blackness-fungi. It prefers forests, gardens, and swamps. It is the most common fungal spore in ambient air.
Cross-reactivity: In general, there is cross-reactivity to spores of other molds (e.g. Aspergillus, Epicoccum).
- The Pollenservice Vienna is part of the University Department of Otolaryngology, Head and Neck Surgery at Medical University of Vienna.
- The collaboration with GeoSphere Austria involves comparing forecasts and exchanging pollen and weather data.
- The Pollenservice Vienna is official partner of the Gesundheitsdienst (MA15) of the City of Vienna.