Dust mites are tiny animals you cannot see.
Every home has dust mites.
They feed on skin flakes and are found in mattresses, pillows, carpets, upholstered furniture, bedcovers, clothes, stuffed toys, and fabric or other fabric-covered items. Body parts and feces of dust mites can trigger asthma in sensitive individuals. Choose washable stuffed toys, wash them often in hot water, and dry thoroughly. Keep stuffed toys off beds. Humidity levels can be measured by hygrometers which are available at local hardware stores.