What can be a consequence of poor indoor air quality?

Poor indoor air quality can lead to various negative health effects, and one of the most commonly reported consequences is the experience of headaches and fatigue. This occurs because the presence of pollutants such as volatile organic compounds (VOCs), mold, and excessive humidity can trigger physiological reactions in individuals. When the air contains irritants or toxins, it can affect the respiratory system and overall wellbeing, leading to symptoms like headaches, fatigue, eye irritation, and reduced cognitive function.

In contrast, options that suggest increased productivity, improved mental health, or enhanced creativity are typically associated with good indoor air quality, where individuals can thrive and function effectively. When air quality is compromised, it often results in the opposite effects, such as decreased concentration levels and overall health issues, reinforcing why option C is the correct choice in this context.