The discharge flow technique has been used with resonance fluorescence detection of N atoms to study the fast radical-radical reaction of ground state nitrogen atoms (4S3/2) with NO and NO2. The rate constants obtained are (in units of cm3 molecule-1 s-1) k1=(2.2¿0.2)¿ 10-11exp<(160¿50)/T> in the temperature range 213 K≤T≤369 K for N+NO→N2+O and k2=(5.8¿0.5)¿10-12 exp <(220¿50)/T) in the temperate range 223 K≤T≤366 K for N+NO2→N2O+O. The reported error limits are at the 95% confidence level. The reaction kinetics are consistent with other radical-radical reactions, essentially no enthalpic barrier is observed. Substitution of the measured rate of R1 for the value recommeded in the lastest Jet Propulsion Laboratory compendium <DeMore et al., 1992> results in a small change in the concentration of ozone predicted in a two-dimensional photochemical model. Modeled ozone concentrations are higher (approximately 1%) in the high-latitude upper stratosphere as a result of a 3--10% reduction in the calculated concentrations of NOy. ¿ American Geophysical Union 1994