What causes mold odor?

Mold odor is primarily caused by microbial volatile organic compounds (MVOC), which are byproducts of the metabolic processes of mold. When mold grows, it releases these organic compounds into the air, leading to the characteristic musty smell often associated with mold contamination. MVOCs can originate from various species of mold and may vary in their chemical structure, contributing to a range of odors.

In contrast, factors like dry air, while potentially affecting mold growth, do not directly produce the odor associated with mold. Pesticides and temperature changes also do not generate the musty smell; rather, they may impact the conditions in which mold thrives or inhibits its growth. Therefore, understanding that MVOCs are the direct cause of the mold odor is crucial for recognizing and addressing mold issues effectively.