A majority of the papers published between 1991 and 1994 dealt with issues of lower stratospheric ozone losses in winter over the polar regions. In part, this was because several comprehensive studies were initiated several years before 1991 in response to political and scientific interest in the large ozone trends detected over the poles during a period when more countries agreed to the Montreal Protocol and its amendments. However, also contributing were the first data from UARS, a satellite that, ironically, had been designed back in the 1970s to examine the upper stratosphere. There is much fascination with the polar regions from the chemical point of view because the effects of dynamics and chemistry are easiest to separate there. However, dynamics plays an extremely important role in establishing and maintaining the circulation patterns that allow the rapid ozone-depleting chemistry to be dominant and influence the chemical partitioning at mid-latitudes.