Mold Is Everywhere (Almost)
It is estimated that about 5 percent of the world's population is allergic to mold. Unlike some other allergens, mold is present indoors and outdoors, and poses a health threat all year long to those who are allergic to it. While mold grows on stationary objects, its spores, which are the particle components of mold that cause allergy symptoms, are carried through the air. The airborne spores are then inhaled en masse into the upper respiratory system and lungs, where they wreak havoc in allergy sufferers. Indoor areas that are most likely to support mold growth include damp areas, such as bathrooms, laundry rooms, kitchens, basements and indoor patios, for example. Items that are mostly likely to sustain mold growth include refrigerators, air conditioners, humidifiers and dehumidifiers, books, carpets, wallpaper, wooden objects and garbage cans, to name a few.
Outdoor mold typically is found in the soil, on vegetation such as tree trunks and piles of dead, wet leaves, and in just about any other outdoor area that is frequently damp. Generally, molds grow better indoors than they do outdoors, and it is certainly true that their spore concentrations typically are more dense outdoors.
To provide an idea regarding how ubiquitous mold is, to completely avoid mold, a person would need to visit an extremely clean room that is equipped with very sophisticated air filtration equipment. Specialized rooms of this kind are few in number, and include organ transplant surgical rooms and certain computer chip manufacturing rooms.