Forecast

Increasing ash pollen levels expected!

The main pollen load phase of the early bloomers is only just slowly coming to an end and the next pollen load period is already on the horizon. As the weather conditions during the first half of the week remain ideal for the pollen count, we can expect a further increase in pollen counts overall.

The pollution caused by hazel and alder are already declining in large parts of Vienna and are mostly in the low to moderate range. Many catkins have already fallen from the plants or only have a low flowering potential. In areas with larger hazel or alder stands, however, higher levels of contamination may still occur locally.

At the same time, the next waves of contamination are already imminent. On the one hand, an increasing number of ash trees are reaching flowering stage and could cause the first low to moderate levels of exposure in the coming days in people who are sensitised to the pollen of this olive tree.

On the other hand, the birch season closer and closer. As things stand, our model data indicate that flowering will begin in the second half of March. We therefore do not yet expect any relevant birch pollen flight.

Forsythia, which is often planted as an ornamental shrub and is also a member of the olive family, is already in flower in many places. However, as it is mainly pollinated by insects, its pollen is rarely released into the air in large quantities. Nevertheless, allergy sufferers should refrain from using flowering forsythia branches as decoration in their living space in order to keep indoor spaces as allergen-free as possible.

The same applies to the pussy willow that can currently be seen in many places. These are the flowers of the willow. Although their pollen is also only classified as moderately allergenic, allergy sufferers are advised not to place these branches in living spaces in order to avoid additional exposure.

In addition to the pollen types mentioned above poplars, elms and yew and cypress plants are represented in the pollen spectrum. However, they only have a very low potential for allergic stress.

Forecast date: 2026-03-09

Note: The data shown here are model data for the expected start of flowering. For more detailed information on the expected pollen count, please refer to the text forecasts.