Dust

A dust storm blankets houses in Texas, 1935
Global oceanic distribution of dust deposition
Map of dust in 2017
Three years of use without cleaning has caused this laptop heat sink to become clogged with dust, such that it can no longer be used.
Domestic dust on a finger

Dust is made of fine particles of solid matter. On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil lifted by wind (an aeolian process), volcanic eruptions, and pollution.

Dust in homes is composed of about 20–50% dead skin cells. The rest, and in offices and other built environments, is composed of small amounts of plant pollen, human hairs, animal fur, textile fibers, paper fibers, minerals from outdoor soil, burnt meteorite particles, and many other materials which may be found in the local environment.

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