Dust in homes typically consists of about 20–50% dead skin cells, with the remainder made up of various materials that can vary depending on the environment. In places like offices, dust often includes traces of plant pollen, human hair, animal fur, textile and paper fibers, as well as minerals from outdoor soil, and even microscopic particles from burnt meteorites. Additionally, dust may contain other substances found in the surrounding environment, with its exact composition influenced by factors such as location and environmental conditions.

According to the dictionary, dust is defined as fine, dry particles of matter, often composed of small fragments like soil, dirt, or dead skin cells, which accumulate on surfaces. It can also refer to the fine powdery residue from burning or grinding substances, as well as particles suspended in the air that gradually settle over time.