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Glossary of Mold Related Terms

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UG/M3

Micrograms per cubic meter

UL

Underwriters' Laboratory

Ulocladium

A rapidly growing, dark brown or black fungus that is a potential allergen. Its spores are unusually large (1015 um). It is typically found in soil and is frequently encountered at low levels indoors.

UM

Micrometer

Upper Respiratory Tract

Structures that conduct air into the lungs, including the nasal cavity, mouth, pharynx, and larynx.