United Nations/North American Number Datasheet

UN/NA 1053

2.3 - Poisonous gas 2.1 - Flammable gas

Emergency Response Guidebook (ERG, 2020)

A caution icon. The ERG recommendations are developed for use during the initial phase of transportation incidents; they are not intended for spills at facilities.

Material Names

  • Hydrogen sulfide
  • Hydrogen sulphide
ERG book cover

Response Guide 117

Gases - Toxic - Flammable (Extreme Hazard) Gases - Tóxicos - Inflamables (Peligro Extremo) Gaz - Toxiques - Inflammables (Extrêmement Dangereux)


ERG Table 1: Initial Isolation and Protective Action Distances

Name of Material Small Spills
(from a small package or small leak)
Large Spills
(from a large package or many small packages)
in all Directions
Then Protect Downwind First
in all Directions
Then Protect Downwind
Day Night Day Night
Hydrogen sulfide 100 ft 0.1 mi 0.3 mi 1250 ft 1.4 mi 3.9 mi
Hydrogen sulphide 100 ft 0.1 mi 0.3 mi 1250 ft 1.4 mi 3.9 mi

The ERG doesn't predict that large amounts of toxic-by-inhalation gases will be produced if this material is spilled in water.

Hazmat Table (49 CFR 172.101)

UN/NA Proper Shipping Name Hazard Class Labels Notes*

* There are three notes: (1) whether the displayed information is for domestic (U.S.) or international shipping (if neither is specifically indicated, it applies to both), (2) whether the proper shipping name must include one or more technical names of the hazardous material in parentheses, and (3) whether the hazardous material is an inhalation hazard.
UN Hydrogen sulfide 2.3 2.3, 2.1 Inhalation Hazard Zone B

  2.3 - Poisonous gas

  2.1 - Flammable gas