What does ERG stand for?

The correct answer is "Emergency Response Guide." The Emergency Response Guidebook (ERG) is a critical resource used by first responders for hazardous materials incidents. It provides essential information on how to respond safely and effectively to chemical spills and other emergencies involving hazardous materials. The ERG includes guidelines on how to identify materials based on their UN numbers and the specific actions to take for various situations, making it an invaluable tool for emergency personnel on the scene.

The other options do not accurately reflect the commonly used terminology associated with hazardous material response. "Emergency Response Group" might refer to a team or unit involved in responding to emergencies, but it does not represent the guidelines or procedures, which the ERG does. "Emergency Response Guideline" is somewhat close but does not specify that it’s a guidebook meant for immediate reference. "Emergency Rescue Guide" suggests a focus on rescue operations rather than the broader range of emergency response strategies outlined in the ERG.