Which level of protective clothing would be least effective in a chemical spill?

Level D protective clothing is least effective in a chemical spill because it provides minimal protection against hazardous materials. This level typically includes standard work uniforms and safety boots, which may offer some basic barriers against dirt and general contaminants but do not provide enough safeguards against chemical exposure, especially in situations involving hazardous spills where exposure could be high.

In contrast, Level A, B, and C protective clothing are designed to provide various degrees of protection based on the type of exposure anticipated. Level A is the highest level of protection, offering a fully encapsulated suit with an air supply, suitable for the most hazardous environments. Level B also provides a high level of protection but allows for a breathing apparatus without complete body coverage. Level C is used when the type and concentration of airborne substances are known and can be controlled, often utilizing air-purifying respirators in conjunction with chemical-resistant clothing.

Choosing Level D in a chemical spill scenario would expose responders to significant risk, as it lacks the necessary protective barriers to prevent exposure to harmful chemicals. This underscores the importance of selecting the appropriate level of protective gear based on the specific hazards present in the working environment.