Excessive levels of moisture in indoor air can cause problems with _____.

Excessive levels of moisture in indoor air can significantly affect indoor air quality. High humidity levels can lead to the growth of mold and mildew, which can release allergens and other harmful spores into the air. This can trigger respiratory issues, allergies, and other health problems for occupants. Additionally, elevated moisture can interact with various building materials, breaking them down and potentially contributing to a less healthy environment overall. Improving indoor air quality is crucial for the well-being of the inhabitants, making it essential to manage moisture levels effectively.

While moisture can impact room comfort, structural integrity, and energy efficiency, the most direct and significant effect in this context is on indoor air quality, as it specifically relates to health concerns and the presence of air contaminants that can arise from high moisture.