Final answer:
The first step when an exposure incident occurs is to assess the situation and ensure personal safety. This may involve putting on protective equipment such as fire-resistant clothing and breathing apparatus.
Step-by-step explanation:
The first step when an exposure incident occurs is to assess the situation and ensure personal safety. This may involve putting on protective equipment such as fire-resistant clothing and breathing apparatus. The next step is to rescue the victims and provide first aid and CPR if necessary. Finally, the conditions should be reported to superiors for further instructions.