Many grasses are still blooming. This means there is a heightened risk of high grass pollen levels throughout Götaland and Svealand as well as in most of Norrland, according to the Nordic National Museum's website Pollen Report.
In a small part of northernmost Norrland and in the mountains, the risk is also increased.
The pollen levels can be high, especially in dry weather, and in areas next to tall grass.
In addition, the flowering of grey pollen has begun. There is a locally elevated risk of high levels of ragweed pollen in Götaland and parts of southern and central Svealand.
In the rest of Sweden, there may be a small risk of high levels near flowering ragweed.
The current forecast is valid throughout Friday.