As far as I know "we" put the dust into our homes.... comes from, for instance, blankets, carpets, crumbs, etc. etc. Not much you can do about dust coming in through windows - but I had a friend who put up those "sheer" curtains under her regular ones and boy did they stop a lot of dirt and dust coming in the windows.
If you have a dusty parking lot nearby, perhaps ask the owner to pave it ! (good luck with this idea)
Every month I put my bed pillows in the dryer on no-heat to get rid of dust....
I would get rid of or store away anything that gets dusty like stuffed animal toys etc., to make cleaning up the dust easier.
I just read this on internet and thought it was interesting.
It helps to consider the composition of dust. Dust is composed of animal and human dander, sloughed-off skin cells, mold spores, food and plant fibers and residue, insect parts, pollens, and other minute particles.
For allergy sufferers, one of the biggest dust problems is the contribution that our own bodies make to the dust problem. Dead skin cells are a favored food for dust mites. Not only are pieces of dead skin cells present in dust that settles on furniture, but they are also present in our mattresses, carpets, upholstered furniture, and drapery.
One of the most common allergens is the excrement that comes from dust mites that eat these dead skin cells. You guessed it, that excrement becomes part of dust also! As these dust mites die, their remains are also added to dust.
Add to that powdery mold spores that may develop inside our homes, dried flakes from plant and vegetable material, "fuzzies" from fabric, etc.
Anything we bring into our homes, such as wood for fireplaces, clothing that can produce lint, or cardboard and paper that can crumble or produce fine particles when torn can contribute to the dust "population."