In which situation is personal protective equipment (PPE) not necessary?

The situation where personal protective equipment (PPE) is not necessary is in a secure environment with no exposure. In this context, 'secure environment' implies that there are no identifiable threats or hazards present that could pose a risk to personal safety or health. Therefore, since there is no exposure to hazardous materials or situations, the use of PPE becomes unnecessary.

This aligns with standard safety protocols which dictate that PPE should be utilized when there is a potential risk. The other scenarios involve circumstances where the presence of hazardous materials or the possibility of contamination necessitates the use of protective gear to ensure the safety and health of individuals. For instance, being in close proximity to hazardous materials, actively responding to a hazmat incident, or assessing possible contamination all pose potential risks, thereby requiring appropriate PPE to mitigate those dangers.