What is the term used to describe a hazardous environment in which specific procedures must be followed to ensure safety?

The term that best describes a hazardous environment in which specific procedures must be followed to ensure safety is "Control Zones." Control zones are established to delineate areas around a hazardous incident where specific safety protocols must be adhered to. This helps to protect emergency responders and bystanders from the hazards present in the environment.

In the context of emergency services, control zones typically include the hot zone, where there are high risks and only trained personnel are allowed; the warm zone, where decontamination takes place and only personnel with appropriate protective equipment can enter; and the cold zone, which is a safe area for command and support operations.

This concept is critical in incident management, particularly during hazardous material incidents, fires, or other dangerous situations, as it ensures that all responders are aware of their environment and the necessary precautions they need to take to avoid injuries or exposure to harm.