The word dust is a noun. Dust means (1) fine powdery material such as dry earth or pollen that can be blown about in the air, (2) free microscopic particles of solid material, (3) the remains of something that has been destroyed or broken up.
Dust is also a verb that means (1) remove the dust from, (2) rub the dust over a surface so as to blur the outlines of a shape, (3) distribute loosely, (4) cover with a light dusting of a substance.
The following articles and web pages elaborate on the word dust.
A duvet cover can protect your down comforter from body oils, dirt, and dust. Comforter covers with pore sizes smaller than 10 microns can provide protection from dust mite allergens as well.
Air purifiers filter dust, smoke, pollen, pet dander, mold spores, and other airborne particulates in the air. Learn more about air purifiers and how they work.
HEPA filters are designed to filter the air by trapping 99.9% of airborne particles, such as dust, pollen, and tobacco smoke. HEPA stands for High Efficiency Particulate Air (filter).