J. J. Keller® ERG App

The Emergency Response Guide (ERG) App provides fast access to the PHMSA Emergency Response Guidebook, supporting the initial response to hazardous materials and dangerous goods transportation incidents. Built and maintained by J. J. Keller & Associates, Inc., a trusted provider of safety and regulatory compliance solutions, the app is based on the latest published edition of the ERG and designed for speed and clarity when time matters most. Users can browse the full guidebook in a mobile‑optimized format, navigate indexed and color‑coded sections, and search by UN number or material name to quickly locate response guidance. Visual identification tools support material recognition using hazmat placards, road trailer visuals, and rail car references. The app works fully offline, making it reliable in emergency scenes and low‑connectivity environments. Designed for field use, the ERG App supports light and dark mode for readability in all conditions and serves as a trusted reference for first responders, transportation professionals, and safety personnel.