What is a sign that the containment area may not be properly sealed?

A sign that the containment area may not be properly sealed is indicated by low air quality measurements. This is crucial because a sealed containment area is designed to prevent air movement and the escape of hazardous materials, such as asbestos fibers, into the surrounding environment. Low air quality measurements typically suggest a breach or failure in the sealing of the containment, allowing contaminants to escape. Such measurements could include high levels of particulate matter or asbestos fibers in the air, which directly point to potential issues in maintaining a safe and effective containment site.

While factors like visible sunlight entering, strong odors, and creaking noises can provide some clues about the integrity of a space, they are not as definitive as air quality measurements. Sunlight might indicate a breach but does not necessarily mean there's contamination. Strong odors can suggest the presence of materials but do not directly measure air quality. Creaking noises could be related to structural issues, which do not directly correlate with air contamination levels. Thus, low air quality measurements are the most reliable sign of improper sealing in a containment area.