Introduced in the 34th Canadian Parliament, and receiving royal assent on June 23, 1992, the act regulates the transportation of dangerous goods in the country.
Class 2.1, Flammable Gases, bears a black or white flame symbol on a red background.
Class 2.2, Non-flammable and Non-toxic Gases, bears a black or white gas cylinder symbol on a green background.
Class 2.3, Toxic Gases, bears a black skull and crossbones symbol on a white background.
If a product is an oxidizing gas, a yellow placard with black text and a flaming 'O' symbol must be displayed.