Does anyone have hay fever tips (for Berlin) outside of getting an air purifier? do I have to live with the windows closed at all time?

London, Brooklyn, Portland were all fine for me, but pollens in Berlin springs are the bane of my existence. :(

@muan I’ve found windows closed and an air purifier to be the only way. The springtime pollen here is bonkers. :(
@awfulwoman aw ok. Bye bye cool air.
@muan Tell me about it - I live in the attic of an Altbau. 😭