Abstract: Nitrous oxide (N₂O) is a long-lived greenhouse gas that has an important impact on global warming effects. The uncertainty levels of N₂O measurements varying widely among different methods. A comprehensive assessment and comparison of different methods is conducive to improving the accuracy of N₂O greenhouse gas measurement. This article aims not only to improve greenhouse-gas accounting, but also to understand the complex processes contributing to sources and sinks of N₂O, which could be used to develop emission inventories and emission control strategies. In this article, we outline where N₂O measurement is required, describe advances that have been made in developing sensitive analytical techniques and review some promising new technologies. Nowadays, the instruments for measuring N₂O should be able to perform in situ measurements over a long period of time, measure all parameters, and be precise and portable; moreover, they should be capable of integration, automation, and remote control.