What are crucial tasks during a Toxic Gas casualty?

In a toxic gas casualty scenario, setting boundaries and evacuating personnel are critical tasks to ensure safety and minimize exposure to hazardous conditions. Establishing clear boundaries creates a perimeter that prevents unauthorized personnel from entering dangerous areas. This action is crucial for ensuring that individuals remain safe from exposure while allowing trained responders to manage the situation.

Evacuating personnel from the affected areas helps to protect them from potential health risks associated with toxic gas exposure. This action can also enable emergency responders to focus on addressing the source of the toxic gas without the distraction of trying to manage the safety of individuals who are not trained to take necessary precautions.

While the other options involve important aspects of emergency response, they are not as central to the immediate and prioritized tasks necessary for managing a toxic gas incident. For instance, monitoring air quality is vital but comes after ensuring personnel are safely evacuated, while initiating firefighting efforts is more relevant in the case of flammable materials rather than toxic gases specifically.