The chemical agent or hazardous material that interferes with the body’s ability to transfer oxygen to the cells is

In the Incident Command System (ICS), the management of a hydrogen cyanide release or exposure incident demands specialized knowledge and coordination. Hydrogen cyanides, due to its ability to impair oxygen transfer and utilization, pose unique challenges in emergency situations. For instance, in a hazardous materials (HazMat) incident, responders must be equipped with appropriate protective gear and detection equipment to identify and mitigate the risks of this substance. The management of such incidents requires not only medical understanding of the toxic effects of this agent but also coordinated efforts in containment, decontamination, and public safety communication.

Source: https://training.fema.gov/is/courseoverview.aspx?code=is-5.a&lang=en