Inhaling high levels of mold spores can cause asthma attacks in affected individuals. Exposure to high concentrations of mold spores is one cause of allergic immune response in anyone. Elderly, youthful or infirm individuals are the first to be affected, but no one is "immune." High concentrations of any particulate like mold is a danger factor in tightly constructed new homes. Outdoor air contains environmental levels of mold; trapped inside a tightly built new home, high levels are an indication that corrective action needs to be taken. As you can see in this chart from the 1930's, mold sampling technology has been with us a while; but we use state of the art technology which can immediately measure particulate levels in the environment.
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