What does a musty odor typically indicate during an environmental assessment of a residential or occupational space?
Answer
Microbial volatile organic compounds from an active colony
A musty odor is a strong indicator of microbial volatile organic compounds (mVOCs), which are emitted by fungi. Even if mold colonies are not visible to the naked eye—often because they are hidden behind walls or in HVAC systems—the distinct smell confirms that active fungal growth is occurring nearby. It is a critical red flag in any environmental audit.
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