This Assessment presents an updated emissions budget, new projections of ozone, climate and air quality impacts under different scenarios, and the most recent evaluations of effectiveness and costs of abatement measures across all major sectors. It also introduces some of the potential risks of new decarbonization technologies, including ammonia as a fuel for marine shipping, on nitrous oxide emissions. In short, it is a succinct, one-stop shop for stakeholders to find essential information on nitrous oxide.