ATMOS measurements made over a wide range of altitudes and latitudes demonstrate compact correlations between mixing ratios of CH4 and N2O. Tight but distinct correlations are observed for the tropics, the springtime Arctic vortex, and the extra-tropics/extra-vortex regions, indicating dynamical isolation between these regions. Little variability is apparent in correlations between [CH4] and [N2O] from measurements made in different years (1992, 1993, and 1994), seasons (March/April and November), and hemispheres.