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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# 3246 - 3306

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
3246	Methanesulfonyl chloride	30	100	0.1	0.1	0.1	0.1	30	100	0.2	0.1	0.2	0.2
3246	Methanesulphonyl chloride	30	100	0.1	0.1	0.1	0.1	30	100	0.2	0.1	0.2	0.2
3275	Nitriles, poisonous, flammable, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.9	0.5
3275	Nitriles, toxic, flammable, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.9	0.5
3276	Nitriles, poisonous, liquid, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.9	0.5
3276	Nitriles, poisonous, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.9	0.5
3276	Nitriles, toxic, liquid, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.9	0.5
3276	Nitriles, toxic, n.o.s.	30	100	0.1	0.1	0.2	0.1	60	200	0.5	0.3	0.9	0.5
3278	Organophosphorus compound, poisonous, liquid, n.o.s.	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
3278	Organophosphorus compound, poisonous, n.o.s.	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
3278	Organophosphorus compound, toxic, liquid, n.o.s.	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
3278	Organophosphorus compound, toxic, n.o.s.	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
3279	Organophosphorus compound, poisonous, flammable, n.o.s.	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
3279	Organophosphorus compound, toxic, flammable, n.o.s.	30	100	0.4	0.3	1.2	0.8	200	600	2.6	1.6	4.5	2.8
3280	Organoarsenic compound, liquid, n.o.s.	30	100	0.2	0.1	0.8	0.5	150	500	2	1.3	4.8	3
3280	Organoarsenic compound, n.o.s.	30	100	0.2	0.1	0.8	0.5	150	500	2	1.3	4.8	3
3281	Metal carbonyls, liquid, n.o.s.	150	500	1.4	0.9	4.9	3.1	1000	3000	11+	7+	11+	7+
3281	Metal carbonyls, n.o.s.	150	500	1.4	0.9	4.9	3.1	1000	3000	11+	7+	11+	7+
3287	Poisonous liquid, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3287	Poisonous liquid, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3287	Poisonous liquid, inorganic, n.o.s.	30	100	0.2	0.1	0.3	0.2	150	500	0.6	0.4	1.1	0.7
3287	Toxic liquid, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3287	Toxic liquid, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3287	Toxic liquid, inorganic, n.o.s.	30	100	0.2	0.1	0.3	0.2	150	500	0.6	0.4	1.1	0.7
3289	Poisonous liquid, corrosive, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3289	Poisonous liquid, corrosive, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3289	Poisonous liquid, corrosive, inorganic, n.o.s.	30	100	0.2	0.1	0.3	0.2	60	200	0.7	0.5	1.2	0.8
3289	Toxic liquid, corrosive, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3289	Toxic liquid, corrosive, inorganic, n.o.s.	60	200	0.8	0.5	1.8	1.1	300	1000	2.9	1.8	5.7	3.6
3289	Toxic liquid, corrosive, inorganic, n.o.s.	30	100	0.2	0.1	0.3	0.2	60	200	0.7	0.5	1.2	0.8
3294	Hydrogen cyanide, solution in alcohol, with not more than 45% Hydrogen cyanide	30	100	0.1	0.1	0.3	0.2	200	600	0.5	0.3	1.9	1.2
3300	Carbon dioxide and Ethylene oxide mixture, with more than 87% Ethylene oxide	30	100	0.1	0.1	0.2	0.1	150	500	0.8	0.5	2.5	1.6
3300	Ethylene oxide and Carbon dioxide mixture, with more than 87% Ethylene oxide	30	100	0.1	0.1	0.2	0.1	150	500	0.8	0.5	2.5	1.6
3303	Compressed gas, poisonous, oxidizing, n.o.s.	100	300	0.5	0.3	2.1	1.3	800	2500	4.4	2.7	8.9	5.6
3303	Compressed gas, poisonous, oxidizing, n.o.s.	100	300	0.5	0.3	2.1	1.3	800	2500	4.4	2.7	8.9	5.6
3303	Compressed gas, poisonous, oxidizing, n.o.s.	60	200	0.2	0.2	1	0.6	500	1500	2.7	1.7	7.2	4.5
3303	Compressed gas, poisonous, oxidizing, n.o.s.	30	100	0.1	0.1	0.3	0.2	300	1000	1.3	0.8	4.1	2.6
3303	Compressed gas, poisonous, oxidizing, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3303	Compressed gas, toxic, oxidizing, n.o.s.	100	300	0.5	0.3	2.1	1.3	800	2500	4.4	2.7	8.9	5.6
3303	Compressed gas, toxic, oxidizing, n.o.s.	100	300	0.5	0.3	2.1	1.3	800	2500	4.4	2.7	8.9	5.6
3303	Compressed gas, toxic, oxidizing, n.o.s.	60	200	0.2	0.2	1	0.6	500	1500	2.7	1.7	7.2	4.5
3303	Compressed gas, toxic, oxidizing, n.o.s.	30	100	0.1	0.1	0.3	0.2	300	1000	1.3	0.8	4.1	2.6
3303	Compressed gas, toxic, oxidizing, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3304	Compressed gas, poisonous, corrosive, n.o.s.	150	500	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3304	Compressed gas, poisonous, corrosive, n.o.s.	150	500	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3304	Compressed gas, poisonous, corrosive, n.o.s.	30	100	0.2	0.1	1	0.6	400	1250	2.4	1.5	6.5	4
3304	Compressed gas, poisonous, corrosive, n.o.s.	30	100	0.1	0.1	0.4	0.3	300	1000	1.7	1.1	3.6	2.2
3304	Compressed gas, poisonous, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3304	Compressed gas, toxic, corrosive, n.o.s.	150	500	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3304	Compressed gas, toxic, corrosive, n.o.s.	150	500	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3304	Compressed gas, toxic, corrosive, n.o.s.	30	100	0.2	0.1	1	0.6	400	1250	2.4	1.5	6.5	4
3304	Compressed gas, toxic, corrosive, n.o.s.	30	100	0.1	0.1	0.4	0.3	300	1000	1.7	1.1	3.6	2.2
3304	Compressed gas, toxic, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3305	Compressed gas, poisonous, flammable, corrosive, n.o.s.	100	300	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3305	Compressed gas, poisonous, flammable, corrosive, n.o.s.	100	300	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3305	Compressed gas, poisonous, flammable, corrosive, n.o.s.	30	100	0.2	0.1	1	0.6	800	2500	4.2	2.6	10.3	6.4
3305	Compressed gas, poisonous, flammable, corrosive, n.o.s.	30	100	0.1	0.1	0.3	0.2	300	1000	1.3	0.8	4.1	2.6
3305	Compressed gas, poisonous, flammable, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3305	Compressed gas, toxic, flammable, corrosive, n.o.s.	100	300	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3305	Compressed gas, toxic, flammable, corrosive, n.o.s.	100	300	0.7	0.4	2.5	1.6	800	2500	4.7	2.9	10.3	6.4
3305	Compressed gas, toxic, flammable, corrosive, n.o.s.	30	100	0.2	0.1	1	0.6	800	2500	4.2	2.6	10.3	6.4
3305	Compressed gas, toxic, flammable, corrosive, n.o.s.	30	100	0.1	0.1	0.3	0.2	300	1000	1.3	0.8	4.1	2.6
3305	Compressed gas, toxic, flammable, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3306	Compressed gas, poisonous, oxidizing, corrosive, n.o.s.	100	300	0.6	0.4	2.5	1.5	800	2500	4.4	2.7	8.9	5.6
3306	Compressed gas, poisonous, oxidizing, corrosive, n.o.s.	100	300	0.6	0.4	2.5	1.5	800	2500	4.4	2.7	8.9	5.6
3306	Compressed gas, poisonous, oxidizing, corrosive, n.o.s.	60	200	0.2	0.2	1	0.6	500	1500	2.7	1.7	7.2	4.5
3306	Compressed gas, poisonous, oxidizing, corrosive, n.o.s.	30	100	0.1	0.1	0.3	0.2	300	1000	1.3	0.8	4.1	2.6
3306	Compressed gas, poisonous, oxidizing, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7
3306	Compressed gas, toxic, oxidizing, corrosive, n.o.s.	100	300	0.6	0.4	2.5	1.5	800	2500	4.4	2.7	8.9	5.6
3306	Compressed gas, toxic, oxidizing, corrosive, n.o.s.	100	300	0.6	0.4	2.5	1.5	800	2500	4.4	2.7	8.9	5.6
3306	Compressed gas, toxic, oxidizing, corrosive, n.o.s.	60	200	0.2	0.2	1	0.6	500	1500	2.7	1.7	7.2	4.5
3306	Compressed gas, toxic, oxidizing, corrosive, n.o.s.	30	100	0.1	0.1	0.3	0.2	300	1000	1.3	0.8	4.1	2.6
3306	Compressed gas, toxic, oxidizing, corrosive, n.o.s.	30	100	0.1	0.1	0.2	0.1	150	500	0.7	0.5	2.7	1.7

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
Things you can do to make your home safer.
USDOT Hazardous Materials Table 49 CFR 172.101
An online version of the USDOT's listing of hazardous materials from 49CFR 172.101. This table can be sorted by proper shipping name, UN/NA ID and/or by primary hazard class/division.
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
This database focuses on the most common chemical compounds used in the home and industry.

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