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# 1005 - 1082

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

1005Ammonia, anhydrous301000.
1005Anhydrous ammonia301000.
1008Boron trifluoride301000.
1008Boron trifluoride, compressed301000.
1016Carbon monoxide301000.
1016Carbon monoxide, compressed301000.
1023Coal gas301000.
1023Coal gas, compressed301000.
1026Cyanogen gas301000.
1040Ethylene oxide301000.
1040Ethylene oxide with Nitrogen301000.
1045Fluorine, compressed301000.
1048Hydrogen bromide, anhydrous301000.
1048Hydrogen bromide, anhydrous301000.
1050Hydrogen chloride, anhydrous301000.
1051Hydrocyanic acid, aqueous solutions, with more than 20% Hydrogen cyanide602000.
1051Hydrogen cyanide, anhydrous, stabilized602000.
1051Hydrogen cyanide, stabilized602000.
1052Hydrogen fluoride, anhydrous301000.
1053Hydrogen sulfide301000.
1053Hydrogen sulphide301000.
1062Methyl bromide301000.
1064Methyl mercaptan301000.
1067Dinitrogen tetroxide301000.
1067Nitrogen dioxide301000.
1069Nitrosyl chloride301000.
1071Oil gas301000.
1071Oil gas, compressed301000.
1079Sulfur dioxide602000.
1079Sulphur dioxide602000.
1082Trifluorochloro­ethylene, stabilized301000.

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)

Related Resources


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.

Citing this page

If you need to cite this page, you can copy this text: