What should be done if an employee is exposed to high concentrations of oxygen?

Moving the employee to fresh air and seeking medical attention if symptoms develop is the most appropriate response to exposure to high concentrations of oxygen. When an individual breathes in excessive oxygen, especially in a medical setting, it can lead to various symptoms such as dizziness, respiratory issues, or even oxygen toxicity.

By relocating the person to an area with normal oxygen levels, you help mitigate the immediate risk by reducing their exposure to high concentrations of oxygen. Additionally, monitoring them for symptoms ensures that any adverse effects can be addressed promptly, with medical professionals providing necessary interventions if required.

The other options lack the necessary urgency or practicality required to effectively manage such a situation. For instance, placing someone in a low-oxygen environment could pose additional risks, as could simply allowing them to rest without any action. Providing water does not address the underlying issue related to oxygen exposure and could delay more appropriate care. Thus, prioritizing fresh air and potential medical attention effectively addresses the concern associated with high oxygen concentrations.