The DOT Emergency Response Guidebook (ERG) is the go-to manual for first responders during the critical first minutes of a hazmat transportation incident. It uses a color-coded system to help you identify materials and find safety recommendations fast. Top alternatives: Little Orange Book, ERG 2024, Hazmat First Responder Guide, PHMSA Emergency Response Guide, and North American Emergency Response Guidebook.
You arrive at the scene of a transportation accident. A truck is overturned, a strange liquid is pooling on the asphalt, and you have seconds to figure out what you’re dealing with. Do you evacuate? Shelter in place? What protective gear do you need?
That’s exactly where the DOT Emergency Response Guidebook comes in. Known affectionately as the “Little Orange Book,” this free manual has been the first responder’s best friend for over 50 years . It doesn’t tell you everything about a chemical, but it tells you what you need to know right now, during those crucial first minutes before specialists arrive.
Whether you’re a firefighter, police officer, EMT, or just someone who wants to understand how hazmat incidents are handled, knowing how to navigate the ERG is an essential skill. This guide breaks down everything you need to know about the DOT Emergency Response Guidebook, from its color-coded sections to its life-saving recommendations.
- Core Definition Responses
1. The ERG is a guidebook intended for use by first responders during the initial phase of a transportation incident involving hazardous materials
Example: Use this when explaining the ERG’s purpose to new recruits or colleagues.
Meaning: It’s designed for the critical first minutes of a hazmat incident .
2. The Emergency Response Guidebook is developed jointly by the U.S. Department of Transportation, Transport Canada, and the Secretariat of Communications and Transportation of Mexico
Example: Use this when discussing the international collaboration behind the ERG.
Meaning: It’s a North American resource that also includes input from Argentina .
3. The ERG is known globally as the Little Orange Book
Example: Use this when referring to the ERG in casual conversation with other responders.
Meaning: The nickname comes from its distinctive orange cover .
4. The guidebook is updated every four years to accommodate new products and technology
Example: Use this when discussing the latest edition or planning for training updates.
Meaning: The current edition is ERG 2024, with work on ERG 2028 already underway .
5. The ERG is distributed FREE to all fire, police, or emergency service personnel in North America
Example: Use this when ordering copies for your department or explaining how to get one.
Meaning: PHMSA distributes nearly 2 million free copies to first responders .
6. The ERG provides first responders with a manual intended for use during the initial phase of a transportation incident
Example: Use this when training new personnel on hazmat response.
Meaning: It’s specifically designed for the first 30 minutes of an incident .
7. The ERG incorporates dangerous goods lists from the most recent United Nations Recommendations
Example: Use this when explaining the regulatory basis for the guidebook.
Meaning: It aligns with international hazmat classification standards .
8. The guidebook is available as a book or mobile app
Example: Use this when recommending resources to fellow responders.
Meaning: The ERG 2024 mobile app is available for iOS and Android .
9. The ERG was developed to aid first responders in quickly identifying the specific or generic hazards of the material involved in the incident
Example: Use this when explaining the ERG’s primary function.
Meaning: Rapid hazard identification is the core purpose .
10. The ERG is not intended to provide information on the physical or chemical properties of dangerous goods
Example: Use this when clarifying what the ERG can and cannot do.
Meaning: It’s a response guide, not a chemistry textbook .
11. The initial response phase is the period following arrival at the scene during which the presence of hazardous materials is confirmed
Example: Use this when defining the scope of the ERG’s use.
Meaning: The ERG covers the period before qualified personnel arrive .
12. The ERG identifies small spills as those involving quantities less than 200 liters for liquids and less than 300 kilograms for solids
Example: Use this when determining spill size categories.
Meaning: Spill size determines the recommended response actions .
- Color-Coded Sections Responses
1. The Yellow-bordered pages index dangerous goods in numerical order by UN identification number
Example: Use this when you know the UN number but not the material name.
Meaning: This is your starting point when you have a four-digit UN number .
2. The Blue-bordered pages index dangerous goods in alphabetical order by material name
Example: Use this when you know the material name but not the UN number.
Meaning: This section helps you find the guide number by name .
3. The Orange-bordered pages are the most important section of the guidebook
Example: Use this when explaining where the actual safety recommendations are found.
Meaning: This is where all the emergency response guidance resides .
4. The Green-bordered pages recommend initial isolation and protective action distances for Toxic by Inhalation materials
Example: Use this when dealing with a spill involving toxic gases or water-reactive substances.
Meaning: Green highlighted entries require special evacuation distances .
5. The White pages contain information on how to use the ERG and supporting information
Example: Use this when orienting yourself to the guidebook’s structure.
Meaning: The white pages include definitions and emergency response telephone numbers .
6. An entry highlighted in green in the yellow or blue pages means you need to refer to the green section
Example: Use this when you see a green highlighted entry and need to know what to do next.
Meaning: Green highlighting indicates evacuation areas need to be established .
7. The Orange Guide comprises a total of 62 individual guides
Example: Use this when explaining the scope of the orange section.
Meaning: Each guide provides safety recommendations for a group of similar materials .
8. The Orange Guide provides potential hazards, public safety, and emergency response actions
Example: Use this when explaining what information the orange pages contain.
Meaning: Each guide covers hazards, safety measures, and response actions .
9. The Green pages contain Table 1 with recommended distances for downwind, day and night conditions
Example: Use this when determining evacuation distances for toxic materials.
Meaning: Table 1 covers both small and large spills .
10. Table 2 in the Green pages lists dangerous goods that produce large amounts of toxic gases when spilled in water
Example: Use this when dealing with water-reactive materials.
Meaning: This table identifies which gases are produced .
11. Table 3 in the Green pages gives recommended isolation distances for the six most common toxic-inhalation hazard gases
Example: Use this when dealing with large spills of common toxic gases.
Meaning: Table 3 provides container-specific distances based on wind speed .
12. The ERG includes a flowchart in the white pages that walks you through every step of the decision-making process
Example: Use this when training new responders on how to use the ERG.
Meaning: The flowchart provides a visual guide to the ERG’s use .
- How to Use the ERG Responses
1. Identify the material involved in the incident using hazard communication
Example: Use this as your first step when arriving at a hazmat scene.
Meaning: Placards, labels, or shipping papers help identify the material .
2. Find the UN number or proper shipping name
Example: Use this when you’ve identified the material and need to locate its guide.
Meaning: The UN number is a four-digit code that starts your search .
3. Use the Yellow pages to locate material by UN number
Example: Use this when you have the four-digit UN number.
Meaning: The yellow pages list materials in numerical order .
4. Use the Blue pages to locate material by name
Example: Use this when you know the material name but not the UN number.
Meaning: The blue pages list materials alphabetically .
5. Identify the corresponding Orange guide page
Example: Use this after finding the guide number in the yellow or blue pages.
Meaning: The orange guide contains the actual safety recommendations .
6. Use the Green pages to identify initial isolation distances and protective action distances
Example: Use this when the material is highlighted in green.
Meaning: Green highlighted materials require special evacuation measures .
7. Watch for guide numbers followed by a “P”
Example: Use this when you see a “P” next to a guide number.
Meaning: The material may undergo violent polymerization if heated or contaminated .
8. Consider whether the material is on fire
Example: Use this when determining which recommendations to follow.
Meaning: Fire conditions change the recommended response actions .
9. Check for a Canadian flag at the bottom of a page
Example: Use this when responding in Canada or cross-border incidents.
Meaning: Canadian responders may need an Emergency Response Assistance Plan .
10. Determine if the spill is small or large
Example: Use this when assessing the scale of the incident.
Meaning: Small spills are less than 200 liters for liquids .
11. Note whether the incident is during day or night
Example: Use this when determining evacuation distances.
Meaning: Green page distances differ based on time of day .
12. Follow the flowchart for step-by-step decision-making
Example: Use this when you need guidance on how to navigate the ERG.
Meaning: The flowchart walks you through every step .
- 2024 Edition Updates Responses
1. The 2024 ERG was published by PHMSA in April 2024
Example: Use this when referencing the current edition.
Meaning: The 2024 edition is the latest release .
2. The 2024 edition removed the triangular Marine Pollutant mark and yellow Division 5.2 label
Example: Use this when discussing changes from the 2020 edition.
Meaning: These obsolete markings were removed in the update .
3. The 2024 ERG added guidance on evacuation or shelter-in-place choices
Example: Use this when deciding between evacuation and sheltering.
Meaning: New guidance helps responders choose the best protective action .
4. The 2024 ERG added guidance on spill control methods including diking and absorption
Example: Use this when dealing with liquid spills.
Meaning: New guidance covers inert and non-combustible absorbent materials .
5. The 2024 ERG added 11 new UN numbers for sodium-ion batteries and lithium-ion electric vehicles
Example: Use this when responding to EV or battery incidents.
Meaning: New UN numbers address emerging technology hazards .
6. The 2024 ERG reassigned 19 dangerous goods to different emergency response guide numbers
Example: Use this when verifying guide numbers for specific materials.
Meaning: Guide number assignments were updated for accuracy .
7. The 2024 ERG removed 8 dangerous goods UN numbers
Example: Use this when checking if a UN number is still valid.
Meaning: Some obsolete UN numbers were removed .
8. The 2024 ERG revised 15 emergency response guide tables
Example: Use this when following recommendations for specific materials.
Meaning: Guide tables were updated for accuracy and clarity .
9. The 2024 ERG updated Table 3 isolation distances for the six most common toxic-inhalation hazard gases
Example: Use this when dealing with large spills of toxic gases.
Meaning: New isolation distances reflect updated research .
10. The 2024 ERG added considerations for EV fires in the white pages
Example: Use this when responding to electric vehicle incidents.
Meaning: New guidance addresses lithium battery and EV fire hazards .
11. The 2024 ERG includes a Summary of Changes document available in English, Spanish, and French
Example: Use this when training personnel on what’s new.
Meaning: The summary highlights all major updates from 2020 .
12. The 2024 ERG mobile app launched on April 1, 2024
Example: Use this when recommending the app to fellow responders.
Meaning: The app is available for iOS and Android with automatic updates .
Emergency Response Actions Responses
1. The Orange Guide provides potential hazards including fire, explosion, and health effects
Example: Use this when assessing the dangers of a material.
Meaning: Hazards are listed with the most dangerous first .
2. The Orange Guide provides public safety measures including isolation distances and protective clothing
Example: Use this when establishing a perimeter and choosing PPE.
Meaning: Public safety recommendations protect both responders and the public .
3. The Orange Guide provides emergency response actions for fires and spills
Example: Use this when determining how to handle the incident.
Meaning: Response actions cover fire, spill, and first aid situations .
4. The ERG recommends approaching from upwind and using binoculars to observe the scene
Example: Use this as your initial approach strategy.
Meaning: Upwind approach minimizes exposure to vapors and fumes .
5. The ERG advises avoiding all spilled materials, vapors, fumes, and smoke
Example: Use this when determining your safe distance.
Meaning: Avoidance is the first principle of hazmat response .
6. The Orange Guide includes recommended isolation distances for small and large spills
Example: Use this when setting up your perimeter.
Meaning: Isolation distances vary by spill size .
7. The Orange Guide includes recommendations for protective clothing and respiratory protection
Example: Use this when selecting PPE for the incident.
Meaning: The guide specifies appropriate protective equipment .
8. The ERG provides first aid guidance as a general recommendation
Example: Use this when providing initial medical care.
Meaning: First aid advice is general guidance only .
9. The Green pages provide initial isolation distances for Toxic by Inhalation materials
Example: Use this when dealing with toxic gas releases.
Meaning: Green highlighted materials require special isolation measures .
10. The Green pages provide protective action distances based on day and night conditions
Example: Use this when determining evacuation zones.
Meaning: Atmospheric conditions affect recommended distances .
11. The ERG recommends establishing evacuation areas for green highlighted materials
Example: Use this when you see a green highlighted entry.
Meaning: Green highlighting is a signal to establish evacuation zones .
12. The ERG includes safe standoff distances for improvised explosive devices
Example: Use this when dealing with potential IED threats.
Meaning: The white pages include IED standoff guidance .
- Mobile App and Digital Access Responses
1. The ERG 2024 mobile app is available for iOS and Android
Example: Use this when recommending digital access to fellow responders.
Meaning: The app provides the full ERG in a mobile format .
2. The mobile app updates automatically for existing users
Example: Use this when explaining how to get the latest edition.
Meaning: Users who had the 2020 app received the update automatically .
3. The mobile app is available in English, Spanish, and French
Example: Use this when working with diverse response teams.
Meaning: Language options are available via in-app settings .
4. The mobile app allows search by name or UN number
Example: Use this when you need to quickly find information on scene.
Meaning: The app has a search function for rapid lookup .
5. The mobile app includes tools to plot protective distances
Example: Use this when establishing evacuation zones.
Meaning: The app has mapping tools for distance calculation .
6. PHMSA discontinued the ERG for Windows application
Example: Use this when someone asks about the desktop version.
Meaning: The Windows app is no longer available; use the mobile app or PDF instead .
7. Full PDFs of the ERG 2024 are available in English, Spanish, and French
Example: Use this when downloading the guidebook for training.
Meaning: PDF versions are available on the PHMSA website .
8. The ERG 2024 has over 2 million mobile app users
Example: Use this when discussing the popularity of the digital version.
Meaning: The app is widely adopted across North America .
9. The ERG mobile app was developed in-house by PHMSA
Example: Use this when discussing the app’s features.
Meaning: PHMSA developed the app for reliability and accuracy .
10. The ERG 2024 app launched on April 1, 2024
Example: Use this when referencing the app’s release date.
Meaning: The app was released alongside the printed edition .
11. The ERG 2024 PDF includes accessibility features
Example: Use this when recommending digital versions.
Meaning: The PDFs are designed for accessibility .
12. PHMSA encourages responders to join the over 1.4 million app users
Example: Use this when promoting digital access to the ERG.
Meaning: The mobile app is the recommended digital format .
- Distribution and Access Responses
1. PHMSA distributes nearly 2 million free copies of the ERG to first responders
Example: Use this when explaining how to obtain copies.
Meaning: Free copies are available through state coordinators .
2. The ERG is available to public safety agencies in all states, territories, and tribal entities for free
Example: Use this when ordering copies for your department.
Meaning: Free copies are distributed through state emergency management coordinators .
3. First responders can request hard copies of the ERG from their state coordinators
Example: Use this when you need physical copies.
Meaning: State coordinators handle distribution to local agencies .
4. The ERG is printed on a four-year cycle
Example: Use this when planning for future editions.
Meaning: The next edition will be ERG 2028 .
5. Work on ERG 2028 has already begun
Example: Use this when discussing future updates.
Meaning: Development of the next edition is underway .
6. Revisions to the ERG are based on regulatory changes and public comment
Example: Use this when providing feedback on the guidebook.
Meaning: Comments can be sent to ERGcomments@dot.gov .
7. Commercial suppliers can request publishing files for ERG 2024
Example: Use this when you need to reproduce the ERG for training.
Meaning: Publishing files are available by contacting ERGcomments@dot.gov .
8. The ERG 2024 book is available in English, Spanish, and French
Example: Use this when ordering copies for diverse teams.
Meaning: Hard copies are available in all three languages .
9. PHMSA’s goal is to place an ERG in every public emergency service vehicle nationwide
Example: Use this when discussing the importance of the ERG.
Meaning: The goal ensures all responders have access .
10. More than 16 million free copies have been distributed to the emergency response community
Example: Use this when explaining the ERG’s reach.
Meaning: This represents cumulative distribution over multiple editions .
11. The ERG is also available for purchase through the GPO Bookstore and commercial suppliers
Example: Use this when individuals or non-agencies need copies.
Meaning: Commercial purchase options exist for non-first responders .
12. The ERG 2024 book includes a Summary of Changes document
Example: Use this when training personnel on updates.
Meaning: The summary highlights major changes from the 2020 edition .
- Training and Education Responses
1. The ERG includes a flowchart that walks you through every step of the decision-making process
Example: Use this when training new responders on ERG use.
Meaning: The flowchart is a visual guide to navigating the book .
2. The white pages include information on how to use the ERG
Example: Use this when orienting yourself to the guidebook.
Meaning: The white pages provide instruction and definitions .
3. Training on the ERG is essential for all first responders who may encounter hazmat incidents
Example: Use this when advocating for hazmat training.
Meaning: The ERG is only useful if you know how to use it.
4. The ERG is designed to be used during the initial phase of an incident
Example: Use this when explaining the scope of the guidebook.
Meaning: It’s not a replacement for advanced hazmat training .
5. The ERG mobile app includes the same content as the printed guidebook
Example: Use this when recommending digital training tools.
Meaning: The app provides full ERG content in digital form .
6. The ERG includes a glossary of terms in the white pages
Example: Use this when clarifying technical terminology.
Meaning: The glossary helps responders understand hazmat terminology .
7. The ERG provides guidance on protective clothing selection
Example: Use this when training on PPE selection.
Meaning: The orange guides specify appropriate protective equipment .
8. The ERG includes information on placards, labels, and markings
Example: Use this when training on hazard identification.
Meaning: The white pages explain how to read hazmat placards .
9. The ERG provides guidance on railcar and trailer identification
Example: Use this when training on transportation incident response.
Meaning: The white pages include railcar and trailer identification tables .
10. The ERG is developed with input from an international coordination council
Example: Use this when explaining the guidebook’s credibility.
Meaning: Scientists and emergency services professionals contribute to each edition .
11. The ERG 2024 includes a Summary of Changes brochure for training purposes
Example: Use this when conducting refresher training.
Meaning: The summary helps trainers focus on what’s new .
12. The ERG is available for free download as a PDF for training and reference
Example: Use this when providing resources to trainees.
Meaning: PDF versions are accessible on the PHMSA website .
FAQ
What is the DOT Emergency Response Guidebook?
The DOT Emergency Response Guidebook (ERG) is a free manual for first responders to use during the initial phase of a hazardous materials transportation incident. It helps identify hazards and provides safety recommendations .
How often is the ERG updated?
The ERG is updated every four years. The current edition is ERG 2024, and work on ERG 2028 has already begun .
Is the ERG free for first responders?
Yes. PHMSA distributes nearly 2 million free copies to firefighters, law enforcement, and other first responders through state coordinators .
What do the colors in the ERG mean?
Yellow pages index by UN number, Blue pages index by material name, Orange pages contain safety recommendations, Green pages provide isolation distances for toxic materials, and White pages contain how-to-use information .
Is there a mobile app for the ERG?
Yes. The ERG 2024 mobile app is available for iOS and Android. It updates automatically and is available in English, Spanish, and French .
Conclusion
The DOT Emergency Response Guidebook is more than just a book. It’s a lifeline for first responders facing the unknown in those critical first minutes of a hazmat incident. From the Yellow pages that help you find your material to the Orange pages that tell you what to do, the ERG’s color-coded system is designed for speed and clarity when every second counts.
Whether you’re a seasoned hazmat technician or a rookie firefighter, knowing how to navigate the ERG is non-negotiable. The 2024 edition brings important updates, including new guidance for EV fires, updated isolation distances, and expanded spill control methods.
Save this guide, share it with your crew, and make sure your ERG is always within reach. Because when the call comes in, you’ll want the Little Orange Book by your side. Stay safe out there.
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