What must be monitored daily if negative air machines are exhausted inside the interior of a building?

The correct choice focuses on the need to monitor the Air Monitoring System (AMS) when negative air machines are used within the interior of a building. This monitoring is critical to ensure that airborne asbestos fibers are effectively controlled and to verify that the environment remains safe for both workers and occupants. The AMS provides real-time data about the concentration of airborne asbestos, allowing for timely interventions if levels exceed acceptable thresholds.

In asbestos abatement projects, the use of negative air machines is common to contain and filter contaminated air. However, simply relying on these machines is not enough; ongoing monitoring through an AMS helps confirm that the machines are functioning properly and that the air quality is being maintained at safe levels.

While monitoring humidity levels, airflow, and temperature can contribute to an overall safe work environment, they do not specifically address the presence of airborne asbestos fibers. Therefore, the focus on the Air Monitoring System is crucial for compliance with safety regulations and protecting health in environments where asbestos is present.