A batch reactor that also works as a macro-thermogravimetric analyzer (TGA) was used to study the thermal decomposition of pellets made of straw. The weight loss during pyrolysis was recorded continuously. The experimental work has focused on giving a detailed insight into the identification and quantification of the released volatile products at different pyrolysis temperatures. In addition, the sampled gas flow was processed in a nonthermal plasma reactor. The nonthermal plasma reactor processed the produced gas both before and after liquid removal from the gas fraction. Furthermore, CO2 was mixed with the N-2 carrier gas to achieve a more complex gas composition for the nonthermal plasma. The purpose of using the nonthermal plasma reactor was to study its ability to improve the quality of the produced gas. This should be looked at in connection with the overall purpose of the nonthermal plasma, which is the abatement of pollutants. The effect of nonthermal plasma on the devolatilized products was most obvious at a pyrolysis temperature of 400 degrees C, where the gas fraction increased by 14 wt %. At higher pyrolysis temperatures, less gas was produced by the nonthermal plasma treatment. Because of the nonthermal cracking of the condensable fraction at low temperatures and the dissociation of the CO2 at all temperatures, the higher heating value of the produced gas increased as a result of the use of nonthermal plasma. Although no analysis of the liquid fraction was made, it is believed that the heavier hydrocarbon liquid fraction produced at low pyrolysis temperatures was decomposed into lighter fractions. At a pyrolysis temperature of 400 degrees C, differences in the condensed liquid viscosity compared to the experiment without plasma could easily be observed.