I live in the suburbs, a good distance away from motorways, and other sources of pollution. We have hard floors no carpets anywhere. However we are bathed in dust, which is clothes, bed sheets, couch covers. My laptop needs dusting every two days, when the sun comes in you can see clouds of dust in the air. And it is all clothes fibres.
I was thinking the fans on our laptops and PCs are clogged with this dust (had to open up and clean my son's laptop the other day), so what if I had a large (say 120mm or larger) slow rotating fan (very very quiet) to sit in every room with a filter at the front, to work 24/7, and it would trap a lot of dust. Maybe not all, but something is better than nothing.
I cannot be the only one to have come up with this idea?
I live in a dusty house with a dog and two cats, I use a good quality vacuum cleaner and have dust problems, these include dog and cat hair, the usual human body dust and some gawd awful dust that I presume comes from outside, I have tried your idea of adding fans and filters, all they do is capture small amounts and create a draught and are more bother than they are worth unless you set up one area as a clean room where the room is under pressure to repel dust.
Most of the time I use a damp duster to collect the dust and change the filter on the vacuum cleaner, its easier to do that than trying to vacuum the cats and dog and anything that creates dust ( tried vacuuming the wife once but got a black eye )
What I did find is that 'some' of this dust in this house enters from under carpets via the gaps in floorboards and in the gap between the skirting board and floor and the stairs if its carpeted, the rest comes from outdoors, people, pets, the loft and the vacuum cleaner throwing dust out past its filters.
One guy I knew years ago was into photography and had dust problems, he tried everything but ended up using some heath Robinson throw together vacuum cleaner that vented through a hole in the wall to the outside, I think its based on an American idea, suck it up and dump it where it belongs, outside the place your trying to clean !