Mold is a normal part of our environment, as mold spores are present in the air practically everywhere. These spores differ widely in type and quantities, from place to place. Even in a building that doesn’t have a mold problem, there are still mold spores in the air, arriving from the outside through doors and windows, cracks and crevices, or tracked in by people and pets. This is known as infiltration.
The green cassette provides a sample of the environment outside of your home, giving the lab a baseline from which to analyze your indoor samples.