Dust gets in because a closed house is not a sealed box. Outdoor particles still come in through doors, windows, cracks, and HVAC systems, and people bring in soil and dust on their shoes and clothing.
A lot of indoor dust is made inside the house too. Cooking, cleaning, candles, pets, skin flakes, mold spores, and other indoor sources all add to the pile, and then normal activity like walking, sweeping, and vacuuming kicks settled dust back into the air.
That is why a house can feel dusty even when nobody has opened a window. Indoor dust is a mix of what came in from outside and what was created inside, and the two sources keep feeding each other. Better filtration, regular vacuuming, and fewer particle-making activities are the boring fixes that actually move the needle.
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