Spring blossoms, dusty streets, distant fires and a lack of rain combine to create hazardous respiratory conditions.
Alder catkins (the pollen-rich flowers on alder trees) haven't reached their peak yet, but there are a lot of them. There can be four to five million pollen particles in a single catkin.
As many allergy-sufferers across Finland may have already suspected, birch pollen levels were very high on Wednesday, according to the University of Turku.
High winds blasted across south-western Finland Friday, cutting electricity to customers. The rare June storm peaked on Friday afternoon.
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