Answer:
First Responder Awareness.
Step-by-step explanation:
Emergency medical technician (EMT) acts as a health care provider in the emergency medical services. EMT are trained to handle the emergency situations like traumatic injuries and medical issues.
Johnny acts as an EMT, and able to recognize the the existence of a potentially dangerous scene involving hazardous materials . He is working at the first responder awareness level as it provides the oxygen therapy.
Thus, the answer is First Responder Awareness.