The present work experimentally investigates the individual and combined effect of O-2 and H2O vapor on the separate and simultaneous removal of styrene and NH3 from N-2 at elevated temperatures via corona-discharge reactions. Styrene and NH3 are chosen to represent the trace components in crematory emission because they are chemically dissimilar. Since the crematory emission always contains some O-2 and H2O at elevated temperatures, their effects and the effect of elevated temperature are of practical interest. It is found that the presence of O-2 in N-2 always enhances the removal of styrene and/or NH3 from N-2. The presence of H2O in N-2 generally enhances the removal of styrene and/or NH3 but its presence retards that of NE3 when H2O concentration is too high or the temperature is 300degreesC. The combined effect of O-2 and H2O is found to substantially retard the removal of styrene and/or NH3 compared to the sole effect of coexisting O-2. The general effect of elevated temperature is to decrease the removal efficiency of styrene and/or NH3 compared to the case of room temperature. (C) 2003 Elsevier B.V. All rights reserved.