Which section of the emergency response guidebook would a firefighter use when he/she knows the chemical identification number of the hazardous material?

The yellow section of the emergency response guidebook is specifically organized by the chemical identification numbers of hazardous materials. When a firefighter knows the identification number, they can quickly locate the corresponding entry in this section. Each entry provides essential information about the material, including its hazards, proper handling, precautions, and response measures. This makes it a critical resource for ensuring the safety of both the responder and the public when dealing with hazardous substances.

In contrast, the blue section is organized alphabetically by the name of the material, the green section contains information about specific hazards and appropriate protective actions for toxic inhalation hazards, and the orange section provides general response information to specific risks associated with various incidents. These sections serve their unique purposes but are less direct for someone who has the chemical identification number at hand, which is why the yellow section is the most appropriate choice in this scenario.