What distinguishes Level A protective suits?

Level A protective suits are specifically designed to offer the highest level of protection in hazardous materials response. They are utilized when there is a significant risk of exposure to life-threatening substances, such as toxic gases, vapors, or liquids. These suits are made from materials that provide a barrier against both hazardous chemicals and their vapors, ensuring that the responder is completely shielded from potentially harmful exposures.

This type of protective gear is characterized by its comprehensive coverage, including a self-contained breathing apparatus (SCBA) to supply fresh air. This ensures that the responder can safely operate in highly contaminated environments where respiratory protection is absolutely critical. As a result, Level A suits are essential for situations involving highly hazardous materials and are distinct from lower-level protective gear that may only provide a superficial barrier.

Other options in the question incorrectly describe the capabilities or limitations of Level A suits, highlighting their unique role in extreme hazardous situations.