What characterizes a low air alarm during firefighting operations?

A low air alarm is specifically designed to alert firefighters that the air supply in their Self-Contained Breathing Apparatus (SCBA) is running low. This alarm is a critical safety feature that ensures the firefighter is aware of their remaining air supply, allowing them to make timely decisions about exiting a hazardous environment.

The purpose of the low air alarm is not related to equipment malfunction, low oxygen levels in the atmosphere, or communication errors. Instead, it directly informs the wearer about the status of their air supply, emphasizing the importance of self-awareness and safety during operations in potentially life-threatening situations. Understanding how the low air alarm operates is fundamental for maintaining safety in the field, as it promotes the early evacuation of personnel before air depletion becomes critical.