As the number of occupants in a tightly constructed building increases, what happens to the relative humidity?

When the number of occupants in a tightly constructed building increases, the relative humidity tends to increase as well. This is primarily due to the activities and breathing of the occupants. Each person exhaled water vapor into the air, which raises the moisture content.

In tightly constructed buildings, the ventilation might be limited, which means that the excess moisture generated by occupants is not adequately removed or exchanged with drier outdoor air. Consequently, as more people inhabit the space, the indoor air tends to hold more moisture, leading to higher relative humidity levels.

Additionally, human activities such as cooking, showering, and using appliances can further contribute to humidity levels inside the building. Therefore, the presence of more occupants significantly increases the amount of moisture in the air, resulting in elevated relative humidity.