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Pollen released during the day can stay airborne for hours on the wind, i.e. well into the night. I spent a decade living in Canberra with hay fever and know it only too well.
Whereas you can see most pollens, being much larger, you won't see the mold spores. Any filteration effective against mold spores will be even more effective against pollen. And whereas a viable mold spore can grow into mold (if it finds suitable conditions), pollen will never grow into a plant.
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