An aftertreatment system for an internal combustion engine includes a diesel cold start catalyst member, a lean NOx trap (LNT) member arranged directly adjacent to and downstream of the diesel cold start catalyst, and a selective catalyst reduction (SCR) member arranged downstream of the LNT. The diesel cold start catalyst is operable to reduce NOx emissions at operating temperatures below 200° C. and the LNT and SCR system are operable to reduce NOx emissions at operating temperatures above 200° C.