How does interior relative humidity impact a building environment?

Interior relative humidity plays a significant role in the building environment because it directly affects the dew point and the potential for condensation within a space. Dew point is the temperature at which air reaches saturation and water vapor begins to condense into liquid form. When relative humidity levels are high, the dew point rises, increasing the likelihood of condensation occurring on surfaces such as windows, walls, and other cold surfaces.

Condensation can lead to moisture accumulation, which can result in various issues, including mold growth, deterioration of building materials, and even structural damage over time. Maintaining an appropriate level of relative humidity is therefore crucial for the comfort of occupants and the overall health of the building environment. This connection to condensation makes option B the most relevant choice regarding the impact of interior relative humidity in a building.