Is all mould (mold) harmful to humans?
No. We share the planet with literally hundreds of thousands of kinds of mould, also known as mildew or fungi. Most are harmless to us. Some, like mushrooms, we eat. The organisms that are known to be harmful to us include Stachybotrys atra, Aspergillus versicolor, Penicillium chrysogenum, and Alternaria. Sampling and laboratory testing can determine the type if concerned.