Laundry and clothes by far creates the most dust and particles in my home, probably yours too.
At night, with the lights off and the room dark, turn on your phone LED pointed at the ceiling. Look closely at the air just above the light, you'll see tiny little material threads and speckles. I do not like the idea of constantly breathing that in.
I've used an expensive HEPA air filter in my room and did some testing, lo and behold: when I checked the air with my phone LED it was absolutely teeming with material particulates (probably cotton, which I mostly wear).
The air filter creates a circulation in the room disturbing dormant dust and kicking it up into the air, but the filter doesn't seem to catch and contain this dust.
Alternatively, when I left my room window open without any filter and allow fresh outside air in, the phone LED test later reveals almost pristine air quality probably a 100x decrease in particulates.
I'm now trying out a water-based air scrubber, one that looks like a fish bowl. It agitates the water, non-ultrasonically, just using rotation, and sends air through the wash. Doesn't seem to be more effective than just letting fresh air in through the window though.