What should be done first when approaching a suspected hazardous materials incident?

When approaching a suspected hazardous materials incident, establishing control zones is a critical first step because it helps ensure the safety of responders, the public, and the environment. Control zones, typically including hot, warm, and cold zones, are established to manage the incident site effectively. The hot zone is where the actual hazardous materials are located, and access is limited to personnel in appropriate protective gear. The warm zone acts as a transition area that is also controlled, while the cold zone is the area where safe decontamination and incident command take place.

By setting up these zones initially, first responders can manage the scene safely, control access, and prevent unwarranted exposure to hazards. This foundational action allows for a clearer assessment of the situation and supports subsequent steps, such as substantiating potential hazards, identifying materials involved, and executing any necessary evacuations or decontamination procedures. It's a systematic approach that helps maintain order and prioritize safety in what can often be chaotic and dangerous situations.