Why is it important to test for oxygen levels before entering a confined space?

Testing for oxygen levels in a confined space is crucial primarily to avoid the risk of hypoxia, which occurs when there is insufficient oxygen available to sustain life. In confined spaces, the atmosphere can become hazardous due to various factors, including the presence of contaminants or the displacement of oxygen by other gases. If oxygen levels fall below the safe threshold (typically below 19.5% for safe work conditions), personnel entering the space could experience severe health effects, including dizziness, unconsciousness, or even death due to asphyxiation.

While it is indeed important to comply with safety regulations and ensure the comfort of workers, the primary focus of testing oxygen levels is to safeguard health and prevent life-threatening situations associated with inadequate oxygen environments. Additionally, while overheating can be a concern in confined spaces, it is not directly related to the oxygen levels but rather to temperature control and ventilation. Thus, ensuring adequate oxygen levels directly addresses the most critical safety concern in confined space work.