What is a possible outcome of ineffective building ventilation?

Ineffective building ventilation can lead to reduced indoor air quality, which is a crucial aspect of maintaining a healthy and comfortable living or working environment. When ventilation is insufficient, pollutants such as dust, mold, volatile organic compounds (VOCs), and carbon dioxide can accumulate in indoor spaces. This can result in various health issues, including respiratory problems, headaches, and fatigue, as the fresh air needed to dilute these contaminants is not circulating effectively.

In contrast, the other outcomes mentioned—improved energy performance, increased energy savings, and enhanced thermal comfort—are generally associated with effective ventilation systems that are designed and maintained properly. Poor ventilation typically leads to higher energy consumption since buildings may need to rely more on heating or cooling systems to compensate for temperature imbalances caused by trapped air. Therefore, understanding the importance of adequate ventilation systems is essential for promoting good indoor air quality and preventing health-related issues.