Detailed Instructions: Given a text, write a compressed version of it in a single sentence.
Q: The SCR system reduces NOX through a reaction of ammonia and NOX in the presence of oxygen and a catalyst at temperatures around 315 to 370 °C (600 to 700 ºF). The products of this reaction are water vapor and nitrogen.
A:
The SCR system reduces NOX through a reaction of ammonia.  Water vapor and nitrogen are produced.