It is full of dust. Avoid heavy curtains and venetian blinds. If curtains are used, launder them frequently. Use a dehumidifier in damp places. Keep all clothing in a closet with the door shut.
Molds grow in garbage containers.
Make sure containers are emptied frequently and kept clean. Although indoor plants are not a major source of indoor mold spores, it is wise to limit the number of house plants. Mold is present in the bark of wood. If using a wood-burning fireplace, do not store the wood inside. Live Christmas trees should be avoided.