Why do airborne mold samples sometimes not show that mold contamination is present, even when there is visible surface mold growth?
Mold growing on a surface is not necessarily producing airborne spores, especially in an area that has little or no activity such as an unfinished basement used primarily for storage. Also, if the surface that the mold is growing on is still damp or wet, the mold spores will not become airborne as easily. GML has found cases of significant amounts of active mold growth on building materials without the companion air samples showing elevated mold spores. As long as surface mold growth is present, it will need to be removed, regardless of what air samples show.
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