Regular measurements of stratospheric ozone concentration profiles have been made at Table Mountain, California, since February 1988. During the period up to the end of December 1991, 435 independent profiles were measured by the differential absorption lidar technique. These long-term results and an evaluation of their quality are presented in this paper. The large number of measurements made has allowed the development of a short-term, 4-year, climatology of the ozone concentration profile at this specific location (34.4 ¿ N, -117.7 ¿ W). The effects of the eruption of Mount Pinatubo were not observed in the lidar measurements until August 1991 and the results presented here can essentially be considered as the pre-Pinatubo climatology. ¿ American Geophysical Union 1993