What is a potential risk of inadequate exhaust ventilation?

Inadequate exhaust ventilation can lead to a significant accumulation of indoor contaminants. When exhaust systems are not functioning properly or are insufficiently designed, pollutants such as carbon dioxide, volatile organic compounds (VOCs), moisture, and particulate matter can build up in the indoor environment. This buildup poses health risks, including respiratory issues, headaches, and general discomfort, while also contributing to poor indoor air quality.

In contrast, the other options suggest benefits that are not directly associated with inadequate exhaust ventilation. Improved energy efficiency, increased natural light exposure, and enhanced comfort levels are typically outcomes of proper ventilation systems and practices, not the result of inadequate ventilation. Thus, the potential risk associated with inadequate exhaust ventilation primarily concerns the health implications stemming from the accumulation of harmful indoor contaminants.