Dangerous Goods which are classed as Class 2 gases are defined by dangerous goods regulations as substances which have a vapour pressure of 300 kPa or greater at 50°c or which are completely gaseous at 20°c at standard atmospheric pressure, and items containing these substances.
The class encompasses compressed, liquefied, dissolved, refrigerated liquefied and mixtures of one or more types of gas with one or more vapours of substances of other classes, articles charged with a gas and aerosols.
2.2: Non-flammable, non-toxic
Classifications of all dangerous goods can be found HERE
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