N2O3, or dinitrogen trioxide, is a chemical compound composed of two nitrogen atoms and three oxygen atoms. It is a blue solid at low temperatures and can exist in a gaseous state at higher temperatures. N2O3 is primarily known for its role in the formation of nitrogen oxides, which are important in atmospheric chemistry and can contribute to air pollution. When N2O3 is dissolved in water, it forms nitric acid and nitrous acid, which are significant in various chemical processes. This compound is also studied in the context of environmental science and industrial applications, particularly in the production of fertilizers and explosives.