The present disclosure is directed to an emission treatment system for NOx abatement in an exhaust stream of a lean burn engine. The emission treatment system includes a lean NOx trap (LNT) in fluid communication with and downstream from the lean burn engine and a low-temperature NOx adsorber (LT-NA) in fluid communication with and downstream of the LNT. Further provided is a method for abating NOx in an exhaust stream from a lean burn engine utilizing the disclosed system.