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A NO_x adsorber or NO_x trap (also called Lean NO_x trap, abbr. LNT)^[1] is a device that is used to reduce oxides of nitrogen (NO and NO₂) emissions from a lean burn internal combustion engine by means of adsorption.

^ "NOX REDUCTION WITH NATURAL GAS FOR LEAN LARGE-BORE ENGINE APPLICATIONS USING LEAN NOX TRAP AFTERTREATMENT" (PDF). Archived from the original (PDF) on 2012-09-26. Retrieved 2012-02-07.