What is one common indicator of poor indoor air quality?

One common indicator of poor indoor air quality is the presence of persistent symptoms among occupants, such as headaches, fatigue, or respiratory issues. These symptoms can arise from various factors associated with indoor air quality, including high levels of pollutants, inadequate ventilation, or the presence of mold and allergens. When occupants experience ongoing discomfort or health problems that are linked to their indoor environment, it points to possible deficiencies in air quality and the need for further investigation and remediation.

High energy bills may indicate inefficiencies in heating or cooling systems but do not directly correlate with indoor air quality. Increased natural light generally has positive effects on indoor environments and does not typically relate to air quality issues. Frequent door drafts, while indicative of air leaks that may affect thermal comfort, do not directly signal air quality concerns. Thus, persistent health symptoms serve as a significant and direct indication of potential air quality problems within a building.