Hydrogen can be added to the methane to improve the emission properties of natural gas engines. Mixtures with up to 30 vol% hydrogen and approximately 70 vol% methane are usually referred to as hydromethane. The use of hydromethane improves the combustion properties of the engines and results in lower NOx emissions. In addition, the formation of particulate matter is reduced, as can be seen from the decrease in precursor molecules such as acenaphtene - a cyclic hydrocarbon. To precisely compare the emission profiles of natural gas and hydromethane in non-stationary driving cycles, a powerful V&Fanalyzer is needed that can determine the inorganic substances such as NO, NO2, and other organic compounds.