Nitrous oxide (N₂O) is a greenhouse gas and contributes to ozone depletion, and ammonia (NH₃) contributes to the formation of secondary particulate matter. To reduce global warming and particulate matter, the real-world levels of N₂O and NH₃ emitted from automobiles is required to be examined. However, there are a few studies on the measurements of N₂O and NH₃ in automobile exhaust under the real-world conditions. In this study, we have measured the real-world emissions of N₂O and NH₃ from the latest diesel vehicle equipped with an urea-SCR system. N₂O was measured by an on-board system using mid-IR laser spectroscopy and NH₃ was measured using a sensor-based measurement technique. As a result, NH₃ was not emitted, while N₂O was emitted intermittently when vehicle was running.