Soil air permeability in a Rhodic Hapludox under no-tillage and conventional tillage Air permeability (K a) can be used for assessing soil structure changes due tillage systems. This study tested the hypothesis that the less soil disturbance under no-tillage result in continuous pores and better soil aeration conditions. The objective of this study was to evaluate a Rhodic Hapludox aeration dynamics, by measuring K a , air-filled porosity (ε a) and pore continuity indices (K 1 and N), under conventional tillage (CT) and no-tillage (NT). Undisturbed soil cores were collected in each systems at depths of 0-0,10 and 0,10-0,20 m in Parana Agronomic Institute research farm-IAPAR, in Ponta Grossa, Paraná. K a was determined using falling pressure method in six soil water potentials,-2,-6,-10,-30,-70 e-100 kPa. The soil macroporosity and K a was higher in CT in both depths. The pore continuity assessment by ratio between K a and ε a (K 1) was similar between the systems in the top layer and was higher at CT at depth of 0,10-0,20 m. The continuity index N, relative to the slope from the log-log relationship between K a and ε a was different when calculated for each core individually (n=6) or obtained including all data for each tillage (n=120). The two methods revealed a more continuous pores in CT in the top layer. At depth of 0,10-0,20 m the first (n=6) did not indicate pore continuity difference between the systems, while the second resulted in better pore continuity in NT at this depth.