When plasma-converted gas is used as a fuel for power generation, some emissions to air will naturally result. The emissions are those typically associated with the combustion of any fuel, such as nitrogen oxides and carbon monoxide in exhaust gas. However, as the plasma converted gas is cleaned before it is used, the release of pollutants such as sulphur dioxide, particulates, metals, volatile organic compounds and dioxin will be far lower than for any comparative direct thermal oxidation process such as incineration.

The concentration of some pollutants in exhaust gas, such as nitrogen oxides and carbon monoxide, will always depend on the type of combustion equipment used. However, if a modern burner system is used on the engine coupled to the plasma gasifier, typical concentrations of pollutants in the exhaust gas would be as follows. For comparison, the maximum concentration allowed under the European Waste Incineration Directive (considered to be the strictest emissions legislation) is also shown.

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