What causes dust?

* Skin cells: We shed millions of skin cells every day, and these can contribute to dust.

* Hair: We also shed hair, which can add to dust.

* Pet dander: Pets shed skin cells and hair, which can also contribute to dust.

* Pollen: Pollen from trees, flowers, and other plants can be a major component of dust.

* Dust mites: Dust mites are tiny creatures that live in dust and feed on dead skin cells. They can cause allergies in some people.

* Mold spores: Mold spores are microscopic fungi that can be found in dust. They can also cause allergies in some people.

* Dirt: Dirt can be tracked into a home on shoes, clothes, and pets.

* Other particles: Dust can also contain other particles, such as smoke, soot, and chemicals.