What is the first step a first responder should take upon arriving at the scene of a hazardous materials incident?

The first step a first responder should take upon arriving at the scene of a hazardous materials incident is to evaluate the scene for safety. This critical action involves assessing the situation to identify potential hazards, determining the presence of any toxic materials, and evaluating environmental conditions. By ensuring personal safety and the safety of others at the scene, responders can gather crucial information that will influence subsequent actions.

This evaluation process helps responders establish a perimeter and understand the layout of the incident, including identifying any vulnerable populations or exposures. It also informs responders of necessary protective measures required before engaging in more active measures like containment or evacuating individuals.

Initiating containment, moving people, or communicating with the public should only happen after a thorough assessment of the scene confirms it is safe to approach and act. This systematic approach is vital in hazardous materials incidents, where the risks can escalate rapidly if safety precautions are not observed.