Which statement best describes indoor mold control?

• A. Humidity is sufficient to prevent growth
• B. Ventilation is the sole control measure
• C. Moisture control is essential
• D. Temperature controls mold growth

Answer: (C)

Moisture is the key driver of indoor mold growth. Mold only establishes and spreads where there is enough moisture on surfaces or within building materials, so removing or preventing that moisture is the most reliable way to control it. Humidity alone isn’t enough to prevent mold— damp spots, leaks, condensation, or moisture hidden inside walls can support growth even when ambient humidity isn’t extreme. Ventilation helps move moist air, but it doesn’t fix the underlying moisture sources, and you can ventilate a damp space without eliminating the moisture that mold needs. Temperature can influence how fast mold grows, but molds thrive across a wide range of temperatures as long as moisture is present, so it isn’t a standalone solution. Focusing on moisture control—fixing leaks, drying wet areas promptly, using dehumidification to keep relative humidity low, and preventing condensation—stops mold from taking hold and is the most effective approach to indoor mold control.