In the DOT ERG, which color section is used to locate chemical names by UN ID?

• A. Blue
• B. Yellow
• C. Orange
• D. Green

Answer: (B)

The key idea is how the ERG is organized for quick access. In the DOT Emergency Response Guidebook, the UN identification numbers are grouped in the yellow pages. Those pages are arranged by UN/NA numbers, and each entry lists the chemical name next to its UN ID, with links to the applicable emergency action guidance. So when you have a UN ID, you flip to the yellow section, locate that number, and you see the chemical name immediately. The blue, orange, and green sections serve other purposes—blue covers isolation and protective actions, orange provides substance-specific hazard information and steps, and green offers public safety guidance—but to locate a chemical name by UN ID, the yellow section is the one you use.