mold-neutral: At time of testing, indoor mold spore counts are not significantly higher than outdoor mold spore counts.

1.  The outdoor sample establishes a baseline for comparative evaluation of the indoor air samples. Because there are no federal standards for mold spore count levels in residences, schools, or other buildings, the mold inspection industry guidelines are derived from NYC (New York City) standards and the ACGIH
(American Conference of Governmental Industrial Hygienists).

Naturally occurring biological materials such as mold, fungus, and pollen are not regulated by any government agency, and have no regulatory exposure limits. Current acceptable industry practice as explained in the previous paragraph, provides that if the mold measured in indoor air is substantially different from the mold measured in outdoor air, the indoor air quality is considered to be degraded. If the indoor air samples show elevated levels of mold spores (or inconsistent types of mold), such samples are considered positive for mold. Positive samples indicate the need for additional investigation, supplemental testing, or corrective measures. The theory is that any mold in the house comes from outdoors. If there is more indoors, it must come from indoors.



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