We examine in this paper the consistency of stratospheric ozone photochemistry using data from ATMOS and LIMS experiments. The ATMOS experiment measured vertical profiles of important trace constituents and temperature in the stratosphere during 1985. These observations have been used to constrain the levels of odd nitrogen and odd chlorine in a photochemical model. This model using current recommendations for the photochemical data yields O3 mixing ratios that are in good agreement with the observation. The deviation in ozone is less than 20% except near 52 km. The updated model has also been used in conjunction with the LIMS data to simulate the stratospheric photochemistry corresponding to the 1979 time period. ¿ American Geophysical Union 1989