What key feature distinguishes the Level A and Level B PPE?

The key feature that distinguishes Level A and Level B Personal Protective Equipment (PPE) lies in the degree of protection they offer and their specific design features. Level A PPE provides the highest level of protection against hazardous materials, particularly in situations where there is a potential for exposure to vapors, gases, and fine particles. This level includes vapor-tight suits that completely encapsulate the wearer, offering a barrier against toxic substances.

In contrast, Level B PPE is designed for situations where a high level of respiratory protection is needed but the risk of vapor exposure is not as significant. It does not provide a vapor-tight seal like Level A, but it does protect against splashes, which makes it suitable for many hazardous situations where the primary risk is chemical splashes rather than inhalation of vapors.

Understanding the distinction between these levels is crucial for selecting the appropriate PPE based on the specific hazards present in a given situation. Therefore, the correct answer reflects the essential differences in design and protection levels between Level A and Level B PPE.