What is the purpose of an Escape Breathing Device (EBD)?

The Escape Breathing Device (EBD) is designed specifically to enhance safety during emergency situations where breathable air is compromised, such as environments filled with smoke or toxic gases. Its primary function is to allow users to escape from potentially life-threatening conditions by providing a source of breathable air. This is crucial in scenarios like shipboard fires or hazardous material spills, where the air quality is significantly reduced due to contaminants.

The other options do not represent the purpose of an EBD. Underwater navigation typically requires specialized diving equipment, not an EBD. Air quality measurement is handled by different devices designed for that purpose, not an EBD. Lastly, supplying oxygen during high-altitude flights is more aligned with aviation oxygen systems rather than the specific function of an EBD.