Which item distinguishes a Level B ensemble from the lower levels of PPE?

• A. Air purifying respirator
• B. Hard hat
• C. Self contained breathing apparatus
• D. Inner/outer gloves

Answer: (C)

The key idea here is the level of respiratory protection that defines Level B PPE. Level B is chosen when you need the strongest respiratory protection but don’t require a fully encapsulating suit. The self-contained breathing apparatus provides its own air supply, delivering breathable air regardless of the surrounding atmosphere. This allows entry into environments that are oxygen-deficient or contain toxic vapors, without depending on the ambient air.

An air-purifying respirator, which filters contaminants from the surrounding air, cannot supply air in oxygen-poor or highly hazardous conditions and thus isn’t adequate for the most dangerous scenarios that Level B covers. That’s why the self-contained breathing apparatus is the defining piece for Level B. Other items like a hard hat or gloves are important for protection too, but they aren’t what sets Level B apart from lower levels—the respiratory protection method is.