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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.

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Table of Isolation and Protective Action Distances

UN Number Rage

[1005-1082 | 1092-1582 | 1583-1752 | 1754-1834 | 1836-1953]
[1955-2199 | 2202-2806 | 2810-2978 | 2985-3162 | 3246-3306]
[3307-9279]

UN# 2810 - 2978

Isolation and Protective Action Distances Table
		SMALL SPILLS						LARGE SPILLS
UN#	Name of Material	First ISOLATE in all Directions		Then PROTECT Persons Downwind During-				First ISOLATE in all Directions		Then PROTECT Persons Downwind During-
		First ISOLATE in all Directions		Day		Night		First ISOLATE in all Directions		Day		Night
		m	ft	km	mi	km	mi	m	ft	km	mi	km	mi
Please see: How to use the table of initial isolation and protective action distances Current as of: Oct. 2, 2011
2810	Buzz	30	100	0.1	0.1	0.1	0.1	30	100	0.1	0.1	0.5	0.3
2810	BZ	30	100	0.1	0.1	0.1	0.1	30	100	0.1	0.1	0.5	0.3
2810	CS	30	100	0.2	0.1	0.7	0.4	100	300	0.5	0.3	2.1	1.3
2810	DC	30	100	0.1	0.1	0.6	0.4	100	300	0.5	0.3	2	1.3
2810	GA	30	100	0.2	0.1	0.2	0.1	100	300	0.6	0.4	0.7	0.4
2810	GB	60	200	0.4	0.3	1.2	0.8	800	2500	2.3	1.4	4.5	2.8
2810	GD	60	200	0.4	0.3	0.8	0.5	400	1250	1.7	1.1	2.4	1.5
2810	GF	60	200	0.2	0.2	0.3	0.2	150	500	0.9	0.6	1.1	0.7
2810	H	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.2	0.4	0.3
2810	HD	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.2	0.4	0.3
2810	HL	30	100	0.2	0.1	0.3	0.2	100	300	0.5	0.3	1	0.7
2810	HN-1	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.2	0.5	0.4
2810	HN-2	30	100	0.1	0.1	0.1	0.1	60	200	0.3	0.2	0.5	0.3
2810	HN-3	30	100	0.1	0.1	0.1	0.1	30	100	0.1	0.1	0.1	0.1
2810	Lewisite	30	100	0.2	0.1	0.3	0.2	100	300	0.5	0.3	1	0.7
2810	Mustard	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.2	0.4	0.3
2810	Mustard Lewisite	30	100	0.2	0.1	0.3	0.2	100	300	0.5	0.3	1	0.7
2810	Poisonous liquid, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2810	Poisonous liquid, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2810	Poisonous liquid, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2810	Poisonous liquid, organic, n.o.s.	60	200	0.8	0.5	1.8	1.1	400	1250	4.8	3	7.4	4.6
2810	Poisonous liquid, organic, n.o.s.	60	200	0.8	0.5	1.8	1.1	400	1250	4.8	3	7.4	4.6
2810	Poisonous liquid, organic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2810	Sarin	60	200	0.4	0.3	1.2	0.8	800	2500	2.3	1.4	4.5	2.8
2810	Soman	60	200	0.4	0.3	0.8	0.5	400	1250	1.7	1.1	2.4	1.5
2810	Tabun	30	100	0.2	0.1	0.2	0.1	100	300	0.6	0.4	0.7	0.4
2810	Thickened GD	60	200	0.4	0.3	0.8	0.5	400	1250	1.7	1.1	2.4	1.5
2810	Toxic liquid, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2810	Toxic liquid, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2810	Toxic liquid, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2810	Toxic liquid, organic, n.o.s.	60	200	0.8	0.5	1.8	1.1	400	1250	4.8	3	7.4	4.6
2810	Toxic liquid, organic, n.o.s.	60	200	0.8	0.5	1.8	1.1	400	1250	4.8	3	7.4	4.6
2810	Toxic liquid, organic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2810	VX	30	100	0.1	0.1	0.1	0.1	60	200	0.4	0.2	0.4	0.3
2811	CX	30	100	0.1	0.1	0.7	0.4	100	300	0.5	0.3	2.3	1.4
2826	Ethyl chlorothioformate	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.7	0.5
2845	Ethyl phosphonous dichloride, anhydrous	30	100	0.3	0.2	0.8	0.5	150	500	1.6	1	2.9	1.8
2845	Methyl phosphonous dichloride	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
2901	Bromine chloride	30	100	0.2	0.2	1	0.6	400	1250	2.4	1.5	6.5	4
2927	Ethyl phosphonothioic dichloride, anhydrous	30	100	0.1	0.1	0.1	0.1	30	100	0.2	0.1	0.2	0.2
2927	Ethyl phosphorodichloridate	30	100	0.1	0.1	0.1	0.1	30	100	0.2	0.2	0.3	0.2
2927	Poisonous liquid, corrosive, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2927	Poisonous liquid, corrosive, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2927	Poisonous liquid, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2927	Poisonous liquid, corrosive, organic, n.o.s.	100	300	1.2	0.8	2.8	1.8	600	2000	7.8	4.9	11+	7+
2927	Poisonous liquid, corrosive, organic, n.o.s.	100	300	1.2	0.8	2.8	1.8	600	2000	7.8	4.9	11+	7+
2927	Poisonous liquid, corrosive, organic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2927	Toxic liquid, corrosive, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2927	Toxic liquid, corrosive, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
2927	Toxic liquid, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2927	Toxic liquid, corrosive, organic, n.o.s.	100	300	1.2	0.8	2.8	1.8	600	2000	7.8	4.9	11+	7+
2927	Toxic liquid, corrosive, organic, n.o.s.	100	300	1.2	0.8	2.8	1.8	600	2000	7.8	4.9	11+	7+
2927	Toxic liquid, corrosive, organic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2929	Poisonous liquid, flammable, n.o.s.	60	200	0.7	0.4	2.3	1.4	400	1250	4.6	2.9	8.9	5.5
2929	Poisonous liquid, flammable, n.o.s.	60	200	0.7	0.4	2.3	1.4	400	1250	4.6	2.9	8.9	5.5
2929	Poisonous liquid, flammable, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2929	Poisonous liquid, flammable, organic, n.o.s.	100	300	1.1	0.7	2.6	1.6	600	2000	7.8	4.9	11+	7+
2929	Poisonous liquid, flammable, organic, n.o.s.	100	300	1.1	0.7	2.6	1.6	600	2000	7.8	4.9	11+	7+
2929	Poisonous liquid, flammable, organic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2929	Toxic liquid, flammable, n.o.s.	60	200	0.7	0.4	2.3	1.4	400	1250	4.6	2.9	8.9	5.5
2929	Toxic liquid, flammable, n.o.s.	60	200	0.7	0.4	2.3	1.4	400	1250	4.6	2.9	8.9	5.5
2929	Toxic liquid, flammable, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2929	Toxic liquid, flammable, organic, n.o.s.	100	300	1.1	0.7	2.6	1.6	600	2000	7.8	4.9	11+	7+
2929	Toxic liquid, flammable, organic, n.o.s.	100	300	1.1	0.7	2.6	1.6	600	2000	7.8	4.9	11+	7+
2929	Toxic liquid, flammable, organic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.8	0.5
2977	Radioactive material, Uranium hexafluoride, fissile	30	100	0.1	0.1	0.4	0.2	60	200	0.5	0.3	2.3	1.4
2977	Uranium hexafluoride, fissile containing more than 1% Uranium-235	30	100	0.1	0.1	0.4	0.2	60	200	0.5	0.3	2.3	1.4
2978	Radioactive material, Uranium hexafluoride	30	100	0.1	0.1	0.4	0.2	60	200	0.5	0.3	2.2	1.4
2978	Uranium hexafluoride	30	100	0.1	0.1	0.4	0.2	60	200	0.5	0.3	2.2	1.4
2978	Uranium hexafluoride non fissile or fissile-excepted	30	100	0.1	0.1	0.4	0.2	60	200	0.5	0.3	2.2	1.4

UN Number Rage

[1005-1082 | 1092-1582 | 1583-1752 | 1754-1834 | 1836-1953]
[1955-2199 | 2202-2806 | 2810-2978 | 2985-3162 | 3246-3306]
[3307-9279]

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

Guide for Handling Household Chemicals
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USDOT Hazardous Materials Table 49 CFR 172.101
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US DOT Hazardous Materials Transportation Placards
Hazardous materials placards (DOT placards) are required when shipping hazardous materials in the United States, Canada and Mexico. These pages provide US DOT definitions for each hazmat placard.
Chemical Database
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