Final answer:
EPA Level D protection is the correct answer for nuisance contamination with no atmospheric hazards, providing minimal protection and not requiring the use of respirators.
Step-by-step explanation:
The EPA level of protection used only for nuisance contamination with no atmospheric hazards is Level D. Unlike other levels that deal with specific pollutants and respiratory hazards, Level D is meant for situations where a minimum level of protection is sufficient, as it doesn't deal with substantial chemical, biological, radiological, or nuclear threats.
The protective clothing under this level typically includes a work uniform or coveralls with safety footwear, gloves, and possibly eye protection if deemed necessary, but no respirator is required as the environment is considered safe to breathe.