Dust particles are tiny solid particles that are often found in the air and on surfaces. They can be made up of various materials, including soil, pollen, mold spores, and human-made substances like soot and ash. Dust is usually invisible to the naked eye but can accumulate over time, leading to visible layers on furniture and other surfaces. These particles can vary in size, typically ranging from 1 to 100 micrometers. Dust can affect air quality and may cause allergies or respiratory issues in some individuals. It is also a key component in the study of atmospheric science and environmental health.