According to the EPA allergic reactions to mold are common. They can be immediate or delayed. Mold exposure can irritate the eyes, skin, nose, throat and lungs of both mold-allergic and non-allergic people. The more exposure to mold that a person encounters, the higher chance they have of becoming allergic to the particular species of mold they were exposed to. Mold spores and mold growth are always present outdoors; it’s what keeps leaves and wood from piling up. People tend to have issues when mold growth occurs inside of a building because the toxin and the spore levels build up to levels much higher than found outdoors.