What effect does high humidity have on indoor air quality?

High humidity has a significant impact on indoor air quality, particularly by promoting microbial growth. When humidity levels are elevated, it creates an environment that is conducive to the growth of mold, bacteria, and dust mites. These microorganisms thrive in damp conditions, and their proliferation can lead to various health issues, including allergies and respiratory problems for occupants. In addition to health concerns, high humidity can also contribute to unpleasant odors and visible mold, further deteriorating air quality.

While high humidity might seem beneficial in certain contexts, such as potentially improving thermal comfort under very specific circumstances, it primarily poses risks to air quality due to microbial growth. This is why the focus on its role in promoting microbial growth is critical in occupational hygiene monitoring and assessments.