leppäpölyt

Leppäpölyt is a Finnish term that translates to "alder dust" or "alder pollen." It refers to the airborne particles released by alder trees (Alnus species) during their reproductive cycle. Alders are deciduous trees common in Finland and other northern regions, often found in wet environments like bogs and riverbanks. Their flowering occurs in early spring, typically before the leaves emerge.

The pollen grains are released in large quantities from the male catkins. This release is a significant event in the natural calendar, marking the transition from winter to spring. For many individuals, especially those prone to allergies, leppäpölyt are a well-known allergen. Alder pollen is among the first tree pollens to appear in the spring, contributing to the seasonal increase in hay fever symptoms. The concentration of leppäpölyt in the air can vary greatly depending on weather conditions, such as wind speed and direction, and the geographical density of alder populations. Monitoring of leppäpölyt levels is often part of broader pollen forecasting services in regions where they are prevalent.