Bits of dust are tiny PARTICLES that can be found in the air. They are often referred to as 'PARTICLES' (9 letters) or 'SPECKS' (6 letters). These PARTICLES are usually made up of a variety of materials, such as dirt, pollen, and other airborne substances. They can cause allergies and other respiratory problems if inhaled in large quantities. Bits of dust can also accumulate on surfaces and furniture, making them difficult to clean.