Final answer:
The first priority when assessing scene safety is personal safety.
Step-by-step explanation:
When assessing scene safety, the FIRST priority is your personal safety. While it is important to prioritize all aspects of scene safety, including hazards to the public and bystander safety, your own safety must come first to ensure that you are able to effectively provide assistance to those in need. For example, in the event of a fire, firefighters dress with equipment such as fire-resistant clothing and breathing apparatus to protect themselves before rescuing victims. By prioritizing personal safety, responders can better assess the situation and treat the patient.