Which condition would require a firefighter to wear full bunker gear?

Wearing full bunker gear is essential when entering a structure with smoke present due to the inherent dangers involved. Smoke indicates a presence of heat and potentially toxic gases, which can pose significant risks to firefighters. The full bunker gear is designed to protect firefighters from thermal issues, sharp objects, and exposure to hazardous materials that might be present in environments with smoke. This gear provides thermal insulation and helps maintain the firefighter's safety as they perform their duties. Proper protective equipment is crucial in such conditions to minimize the risk of injury or compromising one’s health.

In contrast, performing utility control typically does not require the same level of protection, as the environment is generally safer. Operating in non-IDLH (Immediately Dangerous to Life or Health) environments is also less hazardous, thereby not necessitating full bunker gear. When extinguishing a vehicle fire, while bunker gear is recommended, the specific condition of smoke in a structure highlights a more profound risk that mandates full protective equipment.