N2O formation and consumption were investigated over a coupled LNT-SCR system consisting of a low-precious metal loaded Pt/Rh LNT catalyst and a commercial Cu-zeolite SCR catalyst. Under lean-rich cycling conditions, N2O emissions from the LNT were found to be partially mitigated by the downstream SCR catalyst. N2O decomposition over the SCR catalyst was observed in the absence of reductant immediately after the switch to rich conditions, while N2O reduction occurred after subsequent breakthrough of the reductant from the LNT. Steady-state data indicate that the former process is weakly promoted by NO which breaks through the LNT at the same time as the N2O. Steady-state experiments revealed the order H-2 > NH3 > CO > C3H6 for the efficacy of N2O reduction with different reductants. These findings suggest that coupled LNT-SCR systems can not only improve overall NO (x) conversion levels but can also mitigate N2O emissions from the LNT catalyst under actual driving conditions.