The reaction between N2(A3&Sgr;) and O(3P) contributes to the production of O(1S) in auroras. It is argued here that the other possible products for the reaction, NO(X2&pgr;)+N(2D,4S) also may be significant and have an important impact upon odd nitrogen chemistry in the auroral E-region and perhaps even the quiet daytime E-region which is formed in part by ionization created by energetic electrons liberated by the absorption of solar X-rays. The reaction between N2(A3&Sgr;) and O2(X3&Sgr;), which has been suggested as leading to N2O formation, is discussed.