The average person creates 1/3 ounce of dead skin each week, which is about the weight of a car key. This dead skin combines with other particles to create household dust.
While that 1/3 ounce doesn’t seem like much, the average home in the United States collects 40 pounds of dust each year.
A commonly quoted statistic is that 80% of dust is made up of dead skin, but that’s actually a pretty small percentage. Dust in houses and offices is made up of a combination of pollen, hair, textile fibers, paper fibers, soil minerals, cosmic dust particles, and various other materials found in the local environment.
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