It is well known that short-term variability in ozone column at a givenlocation is almost solely caused by dynamical changes connected totropospheric pressure systems.Long-term trends and interannual variability of ozone are also influenced bythese dynamical changes.We address two questions, which are still under discussion:What is the impact of these dynamical changes on the observed long-term trendof ozone, andwhat is the quantitative contribution of the physical processes standingbehind the dynamical variabilityto the trends and short-term variability? These processes are identified ashorizontal isentropic transport and the vertical displacement of isentropes.We use a multiple regression modelto analyze the variability of the total ozone column.The model includes a newly introduced explanatory variablebased on the equivalent latitude profile at a given location.Ozone column datais taken from 8 high quality stations ofthe European Dobson spectrometer network.