Emergency Response Guidebook (ERG)

This is an online version of the 2008 Emergency Response Guidebook (ERG) which is produced by the USDOT for first responders during the initial phase of a Dangerous goods/Hazardous Materials incident. Have you ever wondered what those four digit numbers on the placards on the side of trucks and rail cars mean? Our online ERG will give you your answer.

Table of Isolation and Protective Action Distances

UN# 2202 - 2806

Isolation and Protective Action Distances Table
UN#Name of MaterialFirst ISOLATE in all DirectionsThen PROTECT Persons Downwind During-First ISOLATE in all DirectionsThen PROTECT Persons Downwind During-

Please see: How to use the table of initial isolation and protective action distances

Current as of: Oct. 2, 2011

2202Hydrogen selenide, anhydrous2006001.
2204Carbonyl sulfide301000.
2204Carbonyl sulphide301000.
2308Nitrosylsulfuric acid301000.
2308Nitrosylsulfuric acid, liquid301000.
2308Nitrosylsulfuric acid, solid301000.
2308Nitrosylsulphuric acid301000.
2308Nitrosylsulphuric acid, liquid301000.
2308Nitrosylsulphuric acid, solid301000.
2337Phenyl mercaptan301000.
2353Butyryl chloride301000.
23821, 2-Dimethylhydrazine301000.
2382Dimethylhydrazine, symmetrical301000.
2395Isobutyryl chloride301000.
2407Isopropyl chloroformate301000.
2417Carbonyl fluoride301000.
2417Carbonyl fluoride, compressed301000.
2418Sulfur tetrafluoride1003000.
2418Sulphur tetrafluoride1003000.
2421Nitrogen trioxide301000.
2438Trimethylacetyl chloride301000.
2442Trichloroacetyl chloride301000.
2477Methyl isothiocyanate301000.
2480Methyl isocyanate1505001.
2481Ethyl isocyanate1505001.
2482n-Propyl isocyanate1003001.
2483Isopropyl isocyanate1003001.30.831.91000300011+7+11+7+
2484tert-Butyl isocyanate1003001.
2485n-Butyl isocyanate602000.
2486Isobutyl isocyanate602000.
2487Phenyl isocyanate301000.
2488Cyclohexyl isocyanate301000.
2495Iodine pentafluoride301000.
2521Diketene, stabilized301000.
2548Chlorine pentafluoride602000.
2600Carbon monoxide and Hydrogen mixture301000.
2600Carbon monoxide and Hydrogen mixture, compressed301000.
2600Hydrogen and Carbon monoxide mixture301000.
2600Hydrogen and Carbon monoxide mixture, compressed301000.
2605Methoxymethyl isocyanate301000.
2606Methyl orthosilicate301000.
2606Methyl orthosilicate301000.
2644Methyl iodide301000.
2691Phosphorus pentabromide301000.
2692Boron tribromide301000.
2692Boron tribromide301000.
2740n-Propyl chloroformate301000.
2742Isobutyl chloroformate301000.
2742sec-Butyl chloroformate301000.
2743n-Butyl chloroformate301000.
2806Lithium nitride301000.

Data Source for our online 2008 ERG

This information was compiled from the 2008 Emergency Response Guidebook (2008 ERG) which is produced by the U.S. Department of Transportation.

(Data last updated/verified: Oct. 2, 2011)

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WARNING: These pages are for general reference and educational purposes only and MUST NOT be relied upon as a sole source to determine regulatory compliance or where matters of life and health are concerned. This site and the author do not warrant or guarantee the accuracy or the sufficiency of the information provided and do not assume any responsibility for its use.

To ensure regulatory compliance when transporting hazardous materials or dangerous goods, one must receive proper training and certification from a qualified instructor and refer to the current year's Code of Federal Regulations Title 49 (49CFR) or your country's shipping regulations. In matters regarding workplace safety, refer to current OSHA regulations (29CFR) and NIOSH guidelines or your own country's health and safety regulations. No one should ever enter into a hazardous environment without proper training from qualified instructors.

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