Why does every building get dusty inside?
In: Earth Science
Because the people inside lose a lot of hair and old skin, dirt from outside gets blown in by the wind and animals (flies mostly, but also bigger ones) bring dirt inside.
Dust is a mixture of all the stuff flying around and settting somewhere and is, at least i our homes, mostly made up of dead skin and hair.
False premise – they don’t.
Depending on the specific paint used on the walls and ceilings – they can be a major source of dust, there are even some types of wallpaper that can do this.
The other likely cause is air pollution from the outside, city centers and areas around heavy industry or big roads are most often affected.
Either of the first two can cause enough dust to create a visible layer on every surface in the house within a week.
Third is people – we got skin flakes showering off our bodies every second, it takes a few months for a visible layer to form however.
There are also anti-dust interior elements, synthetic rugs and curtains for example tend to attract any dust that forms into themselves due to static electricity, especially if there is even a smidgen of ventilation around. This can keep your house dust free for years, as long as you regularly clean the carpet/curtain that is.
Proper ventilation can also combat dust very effectively, modern hospitals are essentially unable to form dust layers as any particles that break off anything get whisked up and trapped into air filters.
Dust is primarily made of several things: dead skin cells, fungal spores, tiny fibers from clothes etc, loose bug parts, dust mites and other teeny bugs, and their poop (dust mite poop is what triggers dust allergies). It’s pretty much impossible to keep them all out unless the room is hermetically sealed and no humans are left inside, which is not ideal for most buildings.
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