Non-thermal plasma technology has been regarded as a promising alternative technology for NOx removal. The understanding of NO 2 reduction characteristics is extremely important since NO 2 reduction could lower the total NO oxidation rate in the plasma atmosphere. In this study, NO 2 reduction was experimentally investigated using a non-thermal plasma reactor driven by a pulsed power supply for different simulated gas compositions and operating parameters. The NO 2 reduction was promoted by increasing the specific energy density (SED), and the highest conversion rates were 33.7%, 42.1% and 25.7% for Ar, N 2 /Ar and O 2 /Ar, respectively. For a given SED, the NO 2 conversion rate had the order N 2 /Ar>Ar>O 2 /Ar. The highest energy yield of 3.31g/kWh was obtained in N 2 /Ar plasma and decreased with increasing SED; the same trends were also found in the other two gas compositions. The conversion rate decreased with increasing initial NO 2 concentration. Furthermore, the presence of N 2 or O 2 led to different reaction pathways for NO 2 conversion due to the formation of different dominating reactive radicals.