Effect of temperature on nitric oxide (NO) and sulfur dioxide (SO2) removal in a dielectric barrier discharge (DBD) reactor at 25, 50, 100, 150, 200, and 300 degrees C was investigated. The reduced electric field (E/N) changed from 40 to 113 Td at 25 degrees C, and it increased from 77 to 217 Td at 300 degrees C, promoting the formation of active radicals (N and O). In the NO/SO2/N-2/O-2 system, the increased temperature enhanced the decomposition of O-3 and the formation of NO, thereby reducing the NO removal efficiency. However, increasing temperature enhanced the O formation and promoted the rate of SO2 removal reactions, both of which contribute to SO2 removal. In the NO/SO2/N-2/O-2/NH3 system, when the temperature was increased, the generation of OH radicals and the rate of related reactions were promoted, enhancing the NO and SO2 efficiency slightly more than that in the NO/SO2/N-2/O-2 system. In the NO/SO2/N-2/O-2/C2H4 system, the addition of C2H4 promoted the NO removal, but it did not affect the SO2 removal. When the temperature was increased, the generation of HO2 and the rate of NO removal were promoted markedly, increasing the NO removal.