Which hazmat category corresponds to a non-flammable gas?

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Gases used in hazmat transport are categorized by whether they burn. A non-flammable gas is a gas that does not ignite or support combustion under normal conditions; its primary hazard is asphyxiation or displacement of air, not flammability. That’s why the descriptor hazmat non-flammable gas is the best match for this type of substance (examples include nitrogen, helium, and carbon dioxide). The other options point to different hazards: a flammable gas can ignite, a flammable solid is a solid that can burn, and dangerous when wet refers to substances that react with water to release harmful products.