You go into a room that hasn’t had folks in it for 10 years and there is dust everywhere. I thought it was skin cells but obviously not.
Even rooms with no access to the outside have dust.
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Indoors most dust is dust mite feces, they eat your dead skin cells. Anywhere humans exist, dust mites exist. It’s kinda gross, I don’t recommend googling it or thinking about it too much. I’m surprised I didn’t see anyone give you this answer yet. Outdoor dust is mostly random particles like people are saying (pollen, sand, spores, etc) but indoors . . . .
Estimates are that about 40,000 metric tons of cosmic debris strike earth each year. Many thousands of tons of that end up as dust in the atmosphere. So, space dust is a contributing factor of dust on your fireplace mantle.
Dust comes in through the air vents but it also comes down through/around fixtures from the attic. My new house has spray foam insulation on the rafters so it doesn’t have the typical fiberglass or worse cellulose insulation making dirt in the house. This house is easier to keep clean and doesn’t get dusty as fast as my older house.
It settles everywhere, mostly on the floor, biggest surface in your home. You constantly kick it back up so it settles everywhere mostly on the floor, biggest surface in your home.
Lather, rinse, repeat.
I have robot vacs I run as often as I can.
It has drastically helped with dust
Try the Blueair air cleaner. I have all my windows open when weather permits and it has taken care of all the crap that was floating in the air (visible to the naked eye). I run it 24/7 and my hepa filters last one year.
It’s fascinating how something as small as dust can seem to be everywhere. From what I understand, dust can come from a variety of sources such as fibers from clothing, pet hair, and even tiny particles from cooking. It’s amazing how much we can’t see with the naked eye!
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