What type of air is supplied by the SCBA?

The correct answer is based on the fact that SCBA units are designed to provide breathable air to the user in hazardous environments. These systems utilize compressed breathable air, ensuring that the air supplied is safe for the user. The air is stored at high pressure in cylinders and is filtered to remove any contaminants before being delivered to the user, allowing them to operate effectively in environments where normal atmospheric air cannot be inhaled due to toxic or harmful conditions.

The distinction of "compressed breathable air" is crucial because it emphasizes that the air is not only compressed but also suitable for human respiration, meeting specific quality standards. This air is treated to a level that removes harmful components, making it suitable for use while performing tasks in confined spaces, during firefighting, or in otherwise unsafe environments.

Other types of air mentioned, such as treated air, atmospheric air, and filtered air, do not capture the essence of what SCBA systems provide. Treated air may imply some form of enhancement but does not indicate the pressure or suitability for breathing in hazardous conditions. Atmospheric air is the ambient air we breathe, which can contain pollutants and is not suitable for use in dangerous environments. Filtered air does not specify that it is compressed or at a pressure suitable for SCBA use,