Mold Assessment Technician Practice Exam

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What relative humidity percentage should be achieved over a 24-hour period for effective moisture control?

  1. 40%

  2. 50%

  3. 60%

  4. 70%

The correct answer is: 60%

For effective moisture control in indoor environments, maintaining a relative humidity level around 60% is ideal. This percentage is crucial because it strikes a balance between preventing the growth of mold and other moisture-related issues while ensuring comfort for occupants. When the humidity level is too low, it can lead to dry air, negatively affecting health and comfort. Conversely, when the humidity level exceeds 60%, it creates an environment conducive to mold growth, dust mites, and other allergens. By aiming for a relative humidity of 60%, you can create a healthier indoor air quality and mitigate the risks associated with excess moisture. This standard is supported by various health and safety guidelines which recommend these levels to protect against the adverse effects of mold and dampness in living spaces.

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