Mold Assessment Technician Practice Exam

What moisture level is required for mold to effectively grow?

1. Greater than 80%

2. Greater than 85%

3. Greater than 90%

4. Greater than 70%

The correct answer is: Greater than 85%

Mold requires a specific range of moisture levels to thrive, with a relative humidity of 70% or higher generally providing the conditions necessary for mold growth. When humidity levels exceed this threshold, it creates an environment conducive to mold proliferation. While growth can be possible at lower moisture levels, sustained high humidity (greater than 70%) is crucial for effective colonization and reproduction of mold spores. In practice, higher humidity levels facilitate the moisture absorption needed by mold, allowing for an adequate supply of water, which is essential for mold metabolic processes. Therefore, the choice indicating a moisture level greater than 85% reflects a more severe condition that significantly enhances mold growth potential, creating an environment where mold can flourish rapidly. Maintaining indoor humidity below 70% is a recommended practice to prevent mold growth and promote healthy indoor air quality.