Match the situation with the most appropriate respiratory PPE.

A. A plumber inspecting the interior of a large-diameter pipe
B. A plumber working at a site with normal levels of dust and small particles
C. A pipe fitter working for an extended period in a confined space with exposure to vapors

1. Oxygen respirator
2. Dust mask
3. Positive-pressure mask

Dust mask: A plumber working at a site with normal levels of dust and small particles should wear a dust mask to protect against inhaling these particles.

Oxygen respirator: In situations where there are vapors present, like a pipe fitter working for an extended period in a confined space with exposure to vapors, an oxygen respirator is necessary for breathing.

Positive-pressure mask: For a plumber inspecting the interior of a large-diameter pipe, a positive-pressure mask that maintains a higher pressure inside is suitable for protection.

Learn more about Personal Protective Equipment (PPE) here:

https://brainly.com/question/38873089