Nitrogen dioxide is a reddish-brown gas with a pungent, acrid odor above 21.2 °C (70.2 °F; 294.3 K) and becomes a yellowish-brown liquid below 21.2 °C (70.2 °F; 294.3 K). It forms an equilibrium with its dimer… 展开

Industrially, nitrogen dioxide is produced and transported as its cryogenic liquid dimer, dinitrogen tetroxide. It is produced industrially by the oxidation of ammonia, the Ostwald Process. This reaction is the first step in the p… 展开

Nitric acid decomposes slowly to nitrogen dioxide by the overall reaction:
4 HNO3 → 4 NO2 + 2 H2O + O2
The nitrogen dioxide so formed confers the characteristic yellow color often exhibited by this acid. How… 展开

NO2 is used as an intermediate in the manufacturing of nitric acid, as a nitrating agent in the manufacturing of chemical explosives, as a polymerization inhibitor for acrylates, as a flour bleaching agent, and as a room tempe… 展开

Nitrogen dioxide typically arises via the oxidation of nitric oxide by oxygen in air (e.g. as result of corona discharge):
2 NO + O2 → 2 NO2
NO2 is introduced into the environment by natural causes, i… 展开