What effect do high humidity levels in a building have?

High humidity levels in a building significantly increase the risk of mold growth. Mold thrives in environments where moisture is abundant, and high humidity creates the perfect conditions for spores to germinate and flourish. When the relative humidity in a space rises above 60%, it provides sufficient moisture for mold to develop. This is especially critical in areas of a home or building that are poorly ventilated, where excess moisture can accumulate.

Conversely, options suggesting that high humidity prevents mold growth, eliminates musty odors, or cools a room do not hold true. High humidity is a catalyst for mold proliferation, and while inadequate ventilation and moisture control can lead to musty odors, simply having high humidity does not eliminate them. Additionally, while humidity can contribute to a perception of cooling, it primarily affects comfort levels rather than cooling the air itself. Thus, the statement that high humidity levels increase the risk of mold growth is accurate and highlights a crucial aspect of mold prevention strategies in building maintenance.