I tried an outrageous experiment. I took a leaf blower and went room to room blasting any dust off the shelves, windows, cabinets, etc.
The Awair air quality number dropped from around 95 to 75.
My IQAir filters kicked on based on my Hubitat rule, and the 75 started to climb back over a couple hours. It's now at 90 :-).
The idea was to kick up all the dust, and have the IQAir's filter it out of the air. I also scheduled the robot vacuum to get anything that settled on the carpet.
Jan-Mar is a terrible time for my allergies (at least I think it is allergies). I'll try anything to stop the sneezing and runny nose LOL.