Ozone density profiles obtained with ECC balloon sondes during the first 3 years of a joint INPE/NASA long-term program of measurements at Natal have been analyzed. Ozoen variations with time, as expected, are small. A correlation analysis of ozone and temperature profiles taken concurrently indicates a small correlation coefficient in the troposphere, a positive and increasing correlation between the tropopause and the ozone peak, turning negative above it. Outstanding features of the data are tropospheric densities substantially higher than those measured at other low latitude stations and also a total ozone content that is higher than that given by satellite measurements.