Forecast

The birch continues to burden, its blossom is coming to an end!

The week begins cloudy in Lower Austria. On Tuesday it rains widely. As long as it remains dry, the level of pollution will remain moderate to high. The rain provides short-term relief for allergy sufferers. From Wednesday, the weather conditions improve and the pollen count picks up again. Birch is still responsible for the main allergen in the air.

In the Danube region, the Weinviertel and the Vienna Basin, the number of birches which have exhausted their flowering potential and are shedding their catkins, is increasing. In the higher altitudes of the industrial, cider and forest districts, however, the birches still have the potential to release pollen. High pollen concentrations continue to be reached in these regions. In the afternoon hours, allergy-relevant amounts of pollen can be transported from these regions to the lowlands. The flowering of the hornbeam is coming to an end, meaning that only small amounts of pollen were recorded at our measuring stations.

In Lower Austria, the walnuts, theoaks and the beeches. As they are related to the birch family, cross-reactions can also occur in sensitive people.

In the industrial, cider and forest districts ash, poplar and willow are already past their flowering period, meaning that these early bloomers only have a low pollen load.

In Lower Austria, the lilac is in bloom. As a relative of the ash tree, it can trigger cross-reactions in people who are sensitised to olive trees. However, as it is pollinated by insects, it produces significantly less pollen. Exposure therefore occurs mainly in the immediate vicinity. Anyone who is sensitive to olive trees should avoid placing flowering branches indoors.

The currently flowering plane tree is only found in Lower Austria as an ornamental plant in parks or as an avenue tree in residential areas. Here it can cause intensive pollution in the coming days.

In the Danube region, the Weinviertel and the Vienna Basin, the number of early-flowering grasses slowly but steadily increasing. Flowering panicle, tufted and foxtail grasses have already been sighted, meaning that low to moderate levels of stress can be expected in their vicinity. At higher altitudes, the grasses still need some time to flower.

In addition to the pollen types already mentioned, there is currently also pollen from maple, larch, horse chestnut and cypress plants in the air. However, these only have a low allergenic potential.

Forecast from 2026-04-20

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.