Which of the following is NOT a hazard faced by healthcare workers?

C. High altitude exposure is the correct answer because healthcare workers typically do not operate in environments where high altitude presents a threat. The hazards faced by healthcare workers generally include direct patient care situations where they can encounter infectious diseases, be exposed to radiation from diagnostic imaging procedures such as X-rays, and experience workplace violence, which is a concern due to interactions with patients and their families.

While high altitude exposure can be a risk in certain industries (such as aviation or mountaineering), healthcare settings usually operate at standard elevations within hospitals or clinics. Thus, high altitude exposure is not relevant to the typical hazards that healthcare workers experience in their daily roles.