Fungi or molds are present in most temperate climates around the globe, and the presence of fungi is often recognized by visible mold growth or “musty” odors. High levels of fungal allergens can be detected in the indoor environments of many homes, and it has been found that outdoor fungal exposures are more important than indoor in causing allergic symptoms. . One, eliminate sources of moisture. Two, repair water leaks. iii.Avoid having placed water indoors. Maintain indoor humidity at 50% with a dehumidifier or air conditioner. V. Remove moldy substances such as clothes, books, carpets, etc.. Sixth, the use of 5% diluted bleach cleaning solution to clean the surface of washable objects. Seven, normal system maintenance of air-conditioning equipment. Air filters.