Dust

Uncommon card · No. 138298

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, offices, and other built environments is composed of about 20–50% dead skin cells. The rest, 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. Total suspended dust (TSD) concentration, as measured in mg/m3, can vary between 0.01 to 10,000 mg/m3 in various outdoor environments: residential, industrial, and commercial areas, highways, dirt roads (single or multiple vehicle traffic), quarries, and sand storms.

Read on Wikipedia · Image George Everett Marsh Jr., Public domain