Molds are fungi that can be found both indoors and outdoors. No one knows how many species of fungi exist but estimates range from tens of thousands to perhaps three hundred thousand or more. Molds grow best in warm, damp, and humid conditions, and spread and reproduce by making spores. Mold spores can survive harsh environmental conditions, such as dry conditions, that do not support normal mold growth.

What are some of the common indoor molds?

  • Cladosporium
  • Penicillium
  • Alternaria
  • Aspergillus



Indoor Air Quality Info Sheet (PDF)


Related Links

CDC Mold Home Page CDC Mold — Emergency Preparedness