What is the most important factor to monitor to prevent mold growth?

Monitoring indoor humidity levels is crucial in preventing mold growth because mold thrives in moist environments. When humidity levels exceed 60%, the air becomes conducive to mold spores, which can quickly proliferate. Keeping humidity levels between 30% to 50% is generally recommended to inhibit mold development.

Temperature fluctuations do play a role, as warmer temperatures can encourage mold growth, but they are secondary to maintaining proper humidity levels. While frequency of cleaning and air circulation also contribute to mold prevention, they are less significant than humidity control. Cleaning can remove mold spores but does not address the underlying moisture that supports mold growth, and air circulation can help dry out moist areas but will not necessarily regulate humidity levels effectively on its own. Thus, regulating indoor humidity is the most effective strategy to prevent mold growth.