Massachusetts Wastewater Practice Exam

When an SCBA (Self-Contained Breathing Apparatus) cylinder is running low on air, one of the most significant indicators is the continuous sounding of the low-air alarm. This alarm is specifically designed to alert the user to the diminishing air supply, ensuring that they are aware and can take appropriate action, such as exiting the hazardous environment or conserving air.

While it is possible to experience some subtle changes in breathing or a change in the fit of the mask due to pressure variation, the primary and most noticeable effect intended by the SCBA design is the activation of the alarm. Thus, the alarm serves as a critical safety measure, emphasizing the importance of being aware of your air level while working in potentially dangerous conditions. This immediate auditory warning allows users to prioritize their safety and respond promptly to the situation.