Dangerous Goods are articles and substances which are capable of posing a significant risk to health and safety, or to property when transported by land, sea, or air and which are classified according to the regulations. The descriptions, maximum amounts, packing, handling and marking of dangerous goods are specified in detail in the Dangerous Goods Regulations manual published annually by ICAO, IMO, and the DOT.

These regulations are based on instructions derived from United Nations'and the U.S. Department of Transportation recommendations concerning the transportation of dangerous goods.

Dangerous Goods are divided into 9 different classes with their respective divisions:

Class 1 Explosives

Class 2 Gases

Division 2.1: Flammable gases

Division 2.2: Non-flammable, non-toxic gases

Division 2.3: Toxic gases

Class 3: Flammable Liquids

Class 4 Flammable Solids

Division 4.1: Flammable solids

Division 4.2: Spontaneously combustible substances

Division 4.3: Water reactive substances

Class 5 Oxidizing Substances and Organic Peroxides

Division 5.1: Oxidizing substances

Division 5.2: Organic peroxides

Class 6 Toxic and Infectious Substances

Division 6.1: Toxic substances

Division 6.2: Infectious substances

Class 7: Radioactive Materials

Class 8: Corrosive Substances

Class 9: Miscellaneous Dangerous Good