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.
Current pollination
LEGEND
Photo: catkins of Spaeth´s alder are most mature (lower right; catkins of common hazel upper left, of Turkish hazel upper right and of grey alder lower left)
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 catkins of Spaeth´s alder are maturing!
Firstly, it should be noted: currently, there is no pollination. The occurrence of fungal spores in the air declined as well in November.
The pollen season 2026 is in preparation. The catkins of early flowering plants hazel and alder occur already in summer and develop until their flowering time. Closed catkins shall not cause concerns.
The species that will flower as the first among the early flowering trees is Spaeth´s alder. Its flowering start coincides usually with Christmas time. Its catkins are most mature. Currently, they are still closed (see photo). In addition, favorable weather conditions like sunshine are needed to initiate its flower.
Spaeth´s alder (Alnus x spaethii) is a hybrid and a city tree. Its occurrence in Vienna is sparse so that there is no measurable pollination. We observe and report about its flower based on phenology.
The Pollenservice Vienna of the MedUni Vienna measures 365 days a year and observes the development of the vegetation continuously.
The GeoSphere Austria is our partner for weather forecasts and weather data. We are grateful for the professional interchange and the cooperation.
Video Highlight: Ragweed (Ambrosia) pollen from the plant to the microscope slide
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Here you can see the process of embedding ragweed (Ambrosia) pollen. A panicle that is already flowering is tested in the field for pollen release and packaged. In the laboratory, individual flowers are then embedded on a microscope slide and the ragweed (Ambrosia) pollen is examined under the light microscope.