Which level of protection is needed when working with a substance with a high degree of hazard to the skin?

Level A protection is required when working with a substance that poses a high degree of hazard to the skin because this level of protection provides the highest degree of safety. Level A consists of a fully encapsulated suit made of materials impervious to chemical exposure, which includes a self-contained breathing apparatus (SCBA) to ensure personnel are shielded from both inhalation and dermal exposure. This is essential when there is a significant risk of skin contact with highly hazardous materials, making direct contact impossible and preventing any chance of harmful substances permeating through the suit.

In contrast, the other levels of protection, such as Level B, C, and D, do not offer the same level of skin protection as Level A. Level B is used for situations where the primary concern is respiratory protection but does not provide full body protection. Level C is suitable for environments where the contaminants are known and can be controlled but is less effective against high-hazard skin exposure. Level D is the least protective, intended for situations with minimal risk, offering only basic work uniforms. Thus, Level A is the appropriate choice for handling substances that pose a high risk to the skin.