Molds are found in virtually every environment and can be detected, both indoors
and outdoors, year round. Mold growth is encouraged by warm and humid
conditions. Outdoors, they can be found in shady, damp areas or places where
leaves or other vegetation are decomposing. Indoors, they can be found where
humidity levels are high.
Molds form spores which, when dry, float through the air and find suitable
conditions where they can start the growth cycle again.
USDA United States Department of Agriculture
Food Saftey and Inspection Service