Which piece of equipment helps ensure firefighters do not lose consciousness due to low air supply?

The correct answer is a Self-Contained Breathing Apparatus (SCBA). This piece of equipment is essential for firefighters as it provides them with a reliable supply of breathable air while operating in environments that may be filled with smoke, toxic gases, or other hazardous atmospheres. The SCBA includes a high-pressure tank that contains clean air, allowing firefighters to breathe safely and effectively for extended periods.

When firefighters enter dangerous conditions, the risk of oxygen depletion or toxic exposure is significant, and the SCBA ensures that they have a consistent air supply, which prevents loss of consciousness and allows them to perform their duties more effectively. Proper training in using SCBA is critical for all firefighters, as it plays a vital role in their safety and operational efficiency in life-threatening situations.

While other options have their own important functions—for example, a Personal Alert Safety System (PASS) aids in alerting others if a firefighter becomes immobile; these devices serve different purposes and do not directly provide breathable air like the SCBA does.