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A number of spectroscopic investigators have measured ozone absolute intensities in different spectral regions. The mid-infrared frequencies have been studied by two $techniques1,2$. We report here the results of a distinctly different determination of the absorption cross section using a Bruker HR 120 Fourier transform spectrometer in the mid-infrared region. In this study, the infrared and ultraviolet, absorption of ozone were measured simultaneously using selected infrared lines of the $\nu 3$ band and the ultraviolet 253.7 nm Hg line. The accuracy of our absolute infrared intensity measurements are comparable to the 1 % spread in the ultraviolet absorption measurements at 253.7 $nm3$.