4. Is CO2 explosive or flammable?

CO2 is not flammable and cannot be ignited – in fact CO2 is very commonly used in fire extinguishers to put out electrical fires. However, the pipeline bringing CO2 from North Dakota to the Weyburn oilfield is under high pressure in order to transport the CO2 in a liquid-like state. Should the pipeline rupture, the CO2 would be released rapidly and would solidify on contact with the air (forming a dry ice snow) and then evaporate slowly. Depending on the rate of pressure in the pipeline, CO2 would rapidly release but as a non-flammable gas it would not ignite.