Which environmental factor can increase spore levels inside buildings?

The presence of moisture inside a building is a significant environmental factor that can lead to increased spore levels. Mold spores thrive in damp environments, as moisture is essential for their growth and reproduction. When humidity levels are high or when there is water intrusion (from leaks, flooding, or high humidity), it creates an ideal environment for mold growth. This results in higher concentrations of spores that can become airborne and circulate throughout the indoor space.

Natural ventilation can also play a role in managing indoor air quality, including spore levels. While it can help dilute and disperse spores that are already present inside, if there is moisture outside or if external conditions are conducive to mold growth, natural ventilation can inadvertently introduce more spores into the building. Therefore, when considering both moisture and natural ventilation, it becomes clear that both factors can contribute to elevated spore levels indoors, emphasizing the importance of managing moisture and ensuring proper ventilation to maintain a healthy indoor environment.