Recently, the pollen season has begun in southwestern Finland, specifically with the flowering of hazel bushes and alder trees, as reported by the pollen information service from the University of Turku. In the coming days, the amount of hazel pollen is expected to reach moderate levels in southwestern Finland, while other southern and central parts of the country are experiencing lower pollen counts. However, these levels may increase near blooming vegetation.

In addition to local pollen sources, significant amounts of pollen are being carried from other regions, including Southeastern Finland where pollen quantities are observed to be high. Further, pollen from alder and hazel trees is being transported to Finland from other parts of Europe, exacerbating the situation for those suffering from allergies. In southern and central areas of the country, pollen amounts from alder are reportedly ranging from moderate to abundant, while northern Finland remains relatively free of significant pollen levels.

Weather conditions, particularly rainfall, have a direct effect on pollen levels, as increased precipitation tends to reduce the presence of pollen in the air. Typically, hazel pollen peaks during March to April. Notably, in 2025, the onset of flowering in hazelnuts was earlier in February due to unseasonably warm winter conditions, suggesting a trend that may affect future pollen seasons and allergy patterns in Finland.