Which DOT hazard class is associated with gases, and what is a common example encountered at fire scenes?

• A. Class 3 Flammable liquids; Example: Gasoline.
• B. Class 2 Gases; Example: Propane.
• C. Class 4 Flammable solids; Example: Matches.
• D. Class 5.1 Oxidizers; Example: Ammonium nitrate.

Answer: (B)

Gases are categorized as Class 2 in the DOT hazard class system. This group includes gases that are stored under pressure, whether compressed, liquefied, or refrigerated, and they’re carried in cylinders or tanks. A common gas you’ll encounter at fire scenes is propane, which is widely used in grills and portable heaters and is kept in pressurized cylinders. Because propane is a flammable gas, it poses both fire and explosion hazards if its container is damaged or heated. The other options describe different types of materials—flammable liquids, flammable solids, and oxidizers—which are not gases, so they don’t fit the scenario.