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.
| 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- | ||||||||
| Day | Night | 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 | |||||||||||||
| 2202 | Hydrogen selenide, anhydrous | 200 | 600 | 1.3 | 0.8 | 4.6 | 2.9 | 1000 | 3000 | 8.7 | 5.4 | 11+ | 7+ |
| 2204 | Carbonyl sulfide | 30 | 100 | 0.2 | 0.1 | 0.7 | 0.4 | 500 | 1500 | 3.3 | 2.1 | 8.7 | 5.4 |
| 2204 | Carbonyl sulphide | 30 | 100 | 0.2 | 0.1 | 0.7 | 0.4 | 500 | 1500 | 3.3 | 2.1 | 8.7 | 5.4 |
| 2232 | 2-Chloroethanal | 30 | 100 | 0.2 | 0.1 | 0.4 | 0.3 | 100 | 300 | 0.9 | 0.5 | 1.5 | 0.9 |
| 2232 | Chloroacetaldehyde | 30 | 100 | 0.2 | 0.1 | 0.4 | 0.3 | 100 | 300 | 0.9 | 0.5 | 1.5 | 0.9 |
| 2308 | Nitrosylsulfuric acid | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.3 | 300 | 1000 | 0.8 | 0.5 | 2.5 | 1.6 |
| 2308 | Nitrosylsulfuric acid, liquid | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.3 | 300 | 1000 | 0.8 | 0.5 | 2.5 | 1.6 |
| 2308 | Nitrosylsulfuric acid, solid | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.3 | 300 | 1000 | 0.8 | 0.5 | 2.5 | 1.6 |
| 2308 | Nitrosylsulphuric acid | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.3 | 300 | 1000 | 0.8 | 0.5 | 2.5 | 1.6 |
| 2308 | Nitrosylsulphuric acid, liquid | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.3 | 300 | 1000 | 0.8 | 0.5 | 2.5 | 1.6 |
| 2308 | Nitrosylsulphuric acid, solid | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.3 | 300 | 1000 | 0.8 | 0.5 | 2.5 | 1.6 |
| 2334 | Allylamine | 30 | 100 | 0.2 | 0.1 | 0.6 | 0.4 | 150 | 500 | 1.7 | 1.1 | 3 | 1.9 |
| 2337 | Phenyl mercaptan | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2353 | Butyryl chloride | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 1 | 0.6 |
| 2382 | 1, 2-Dimethylhydrazine | 30 | 100 | 0.2 | 0.1 | 0.4 | 0.3 | 100 | 300 | 1 | 0.6 | 1.7 | 1.1 |
| 2382 | Dimethylhydrazine, symmetrical | 30 | 100 | 0.2 | 0.1 | 0.4 | 0.3 | 100 | 300 | 1 | 0.6 | 1.7 | 1.1 |
| 2395 | Isobutyryl chloride | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.2 | 0.2 | 0.6 | 0.4 |
| 2407 | Isopropyl chloroformate | 30 | 100 | 0.2 | 0.1 | 0.3 | 0.2 | 60 | 200 | 0.7 | 0.5 | 1.4 | 0.9 |
| 2417 | Carbonyl fluoride | 30 | 100 | 0.2 | 0.1 | 0.8 | 0.5 | 150 | 500 | 0.9 | 0.5 | 3 | 1.9 |
| 2417 | Carbonyl fluoride, compressed | 30 | 100 | 0.2 | 0.1 | 0.8 | 0.5 | 150 | 500 | 0.9 | 0.5 | 3 | 1.9 |
| 2418 | Sulfur tetrafluoride | 100 | 300 | 0.6 | 0.4 | 2.6 | 1.6 | 800 | 2500 | 4.7 | 2.9 | 10.3 | 6.4 |
| 2418 | Sulphur tetrafluoride | 100 | 300 | 0.6 | 0.4 | 2.6 | 1.6 | 800 | 2500 | 4.7 | 2.9 | 10.3 | 6.4 |
| 2420 | Hexafluoroacetone | 60 | 200 | 0.3 | 0.2 | 1.5 | 0.9 | 1000 | 3000 | 8.4 | 5.2 | 11+ | 7+ |
| 2421 | Nitrogen trioxide | 30 | 100 | 0.1 | 0.1 | 0.3 | 0.2 | 100 | 300 | 0.3 | 0.2 | 1.2 | 0.8 |
| 2434 | Dibenzyldichlorosilane | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.2 | 0.1 | 0.6 | 0.4 |
| 2435 | Ethylphenyldichlorosilane | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.4 | 0.2 | 1.1 | 0.7 |
| 2437 | Methylphenyldichlorosilane | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.2 | 0.1 | 0.6 | 0.4 |
| 2438 | Trimethylacetyl chloride | 30 | 100 | 0.1 | 0.1 | 0.3 | 0.2 | 60 | 200 | 0.6 | 0.4 | 1.1 | 0.7 |
| 2442 | Trichloroacetyl chloride | 30 | 100 | 0.2 | 0.1 | 0.3 | 0.2 | 60 | 200 | 0.7 | 0.5 | 1.3 | 0.8 |
| 2474 | Thiophosgene | 60 | 200 | 0.7 | 0.4 | 2 | 1.3 | 300 | 1000 | 3.1 | 1.9 | 5.3 | 3.3 |
| 2477 | Methyl isothiocyanate | 30 | 100 | 0.1 | 0.1 | 0.2 | 0.1 | 60 | 200 | 0.5 | 0.3 | 0.8 | 0.5 |
| 2480 | Methyl isocyanate | 150 | 500 | 1.8 | 1.1 | 5.3 | 3.3 | 1000 | 3000 | 11+ | 7+ | 11+ | 7+ |
| 2481 | Ethyl isocyanate | 150 | 500 | 1.5 | 1.0 | 3.8 | 2.4 | 1000 | 3000 | 11+ | 7+ | 11+ | 7+ |
| 2482 | n-Propyl isocyanate | 100 | 300 | 1.2 | 0.8 | 2.8 | 1.7 | 800 | 2500 | 9.6 | 6 | 11+ | 7+ |
| 2483 | Isopropyl isocyanate | 100 | 300 | 1.3 | 0.8 | 3 | 1.9 | 1000 | 3000 | 11+ | 7+ | 11+ | 7+ |
| 2484 | tert-Butyl isocyanate | 100 | 300 | 1.1 | 0.7 | 2.6 | 1.6 | 800 | 2500 | 9.3 | 5.8 | 11+ | 7+ |
| 2485 | n-Butyl isocyanate | 60 | 200 | 0.8 | 0.5 | 1.7 | 1.1 | 400 | 1250 | 4.8 | 3 | 6.9 | 4.3 |
| 2486 | Isobutyl isocyanate | 60 | 200 | 0.8 | 0.5 | 1.8 | 1.1 | 400 | 1250 | 4.8 | 3 | 7.4 | 4.6 |
| 2487 | Phenyl isocyanate | 30 | 100 | 0.4 | 0.3 | 0.6 | 0.4 | 150 | 500 | 1.6 | 1 | 2.5 | 1.6 |
| 2488 | Cyclohexyl isocyanate | 30 | 100 | 0.3 | 0.2 | 0.4 | 0.2 | 100 | 300 | 1 | 0.6 | 1.4 | 0.9 |
| 2495 | Iodine pentafluoride | 30 | 100 | 0.1 | 0.1 | 0.5 | 0.4 | 150 | 500 | 1.2 | 0.8 | 4.2 | 2.6 |
| 2521 | Diketene, stabilized | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2534 | Methylchlorosilane | 30 | 100 | 0.2 | 0.1 | 0.7 | 0.4 | 300 | 1000 | 1.6 | 1 | 4.3 | 2.7 |
| 2548 | Chlorine pentafluoride | 60 | 200 | 0.3 | 0.2 | 1.4 | 0.9 | 400 | 1250 | 2.3 | 1.4 | 6.5 | 4.1 |
| 2600 | Carbon monoxide and Hydrogen mixture | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 150 | 500 | 0.7 | 0.5 | 2.7 | 1.7 |
| 2600 | Carbon monoxide and Hydrogen mixture, compressed | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 150 | 500 | 0.7 | 0.5 | 2.7 | 1.7 |
| 2600 | Hydrogen and Carbon monoxide mixture | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 150 | 500 | 0.7 | 0.5 | 2.7 | 1.7 |
| 2600 | Hydrogen and Carbon monoxide mixture, compressed | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 150 | 500 | 0.7 | 0.5 | 2.7 | 1.7 |
| 2605 | Methoxymethyl isocyanate | 30 | 100 | 0.4 | 0.3 | 0.6 | 0.4 | 150 | 500 | 1.6 | 1 | 2.5 | 1.6 |
| 2606 | Methyl orthosilicate | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2606 | Methyl orthosilicate | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2644 | Methyl iodide | 30 | 100 | 0.1 | 0.1 | 0.2 | 0.1 | 100 | 300 | 0.3 | 0.2 | 0.8 | 0.5 |
| 2646 | Hexachlorocyclopentadiene | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.4 | 0.3 | 0.5 | 0.3 |
| 2668 | Chloroacetonitrile | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2676 | Stibine | 60 | 200 | 0.4 | 0.2 | 1.7 | 1.1 | 500 | 1500 | 2.8 | 1.7 | 7.2 | 4.5 |
| 2691 | Phosphorus pentabromide | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.2 | 30 | 100 | 0.4 | 0.3 | 1.5 | 1 |
| 2692 | Boron tribromide | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.2 | 60 | 200 | 0.5 | 0.3 | 1 | 0.6 |
| 2692 | Boron tribromide | 30 | 100 | 0.1 | 0.1 | 0.6 | 0.4 | 100 | 300 | 1 | 0.6 | 3 | 1.9 |
| 2740 | n-Propyl chloroformate | 30 | 100 | 0.2 | 0.1 | 0.3 | 0.2 | 60 | 200 | 0.7 | 0.5 | 1.3 | 0.8 |
| 2742 | Isobutyl chloroformate | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2742 | sec-Butyl chloroformate | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.4 | 0.2 | 0.6 | 0.4 |
| 2743 | n-Butyl chloroformate | 30 | 100 | 0.1 | 0.1 | 0.1 | 0.1 | 30 | 100 | 0.3 | 0.2 | 0.5 | 0.3 |
| 2806 | Lithium nitride | 30 | 100 | 0.1 | 0.1 | 0.4 | 0.2 | 60 | 200 | 0.6 | 0.4 | 2.2 | 1.4 |
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)
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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