What should not be present in a healthy building regarding mold?

A healthy building should be free of visible mold and moldy odors, as these are indicators of mold growth and potential moisture issues. Visible mold often signifies that there is a moisture problem, and it poses health risks to occupants due to allergens and mycotoxins released by mold spores. Moldy odors indicate that mold is present and actively developing, which suggests an unhealthy environment that can lead to various health issues for the residents.

In contrast, while small amounts of mold might occasionally be found in certain environments, it is not typically a concern unless it is visible or growing. High humidity levels can be a factor contributing to mold growth, but managing humidity is key to preventing mold issues. Dust accumulation may be a nuisance but does not directly correlate to mold presence unless it is damp and conducive to growth. Therefore, the presence of visible mold and associated odors clearly indicates a problem that undermines the health of the building.