Which factor is NOT a hint to determine if occupants are still inside a structure?

Temperature is not a reliable or direct indicator to determine if occupants are still inside a structure during a fire situation. While temperature readings may provide information about the environment inside the building, they do not indicate whether there are people present or not.

On the other hand, the time of day can offer contextual clues; for instance, during nighttime, it is more likely that occupants are inside sleeping. Eyewitness accounts are valuable as they can provide first-hand observations regarding the presence of people. The type of occupancy also informs responders about typical behavior; for example, a residential structure may suggest that occupants are likely at home, whereas a commercial building might indicate varying occupancy based on time and business hours. Therefore, temperature does not provide the same level of relevant information regarding potential occupants as the other factors do.