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What observation, combined with high moisture readings, would further indicate mold contamination?

  1. Presence of dust on surfaces

  2. High levels of indoor pollutants

  3. Visible fungal growth on materials

  4. Excessive ventilation

The correct answer is: Visible fungal growth on materials

The presence of visible fungal growth on materials is a strong indicator of mold contamination, particularly when combined with high moisture readings. Mold requires moisture to grow, so the combination of visible growth and elevated moisture levels suggests not only the likelihood of mold but also active mold growth in the environment. This observation helps to confirm that conditions are suitable for mold proliferation, and it underscores the necessity of taking appropriate actions to address the moisture problem and potential health risks associated with mold exposure. Detecting mold growth visually can often lead to timely remediation efforts to ensure a safe indoor environment.