To look up a HazMat in the Emergency Response Guidebook (ERG), you start in either the ____ or ____ sections.

The correct choice involves understanding how the Emergency Response Guidebook (ERG) is structured for quick reference in emergency situations. The ERG is designed to help responders identify hazardous materials and provide guidance on safety measures and response actions.

Starting in the yellow section allows users to look up a HazMat by its identification number, which is essential for quickly identifying the substance involved in an incident. Alternatively, the blue section facilitates locating a HazMat by its name, making it accessible if the identification number is unknown. This dual approach enhances the effectiveness of emergency responses by providing vital information about the hazardous materials in a clear, organized manner.

Each section serves a unique purpose based on how the hazardous material is encountered, whether through a numerical identifier or the name of the substance. Understanding this layout is crucial for first responders to act swiftly and efficiently during an emergency.