What are the trends in ozone and UV?
The following information has been extracted from the WMO/UNEP Scientific Assessment of Ozone Depletion: 1998, the most up-to-date and comprehensive document about the current state of the ozone layer. Ozone trends in midlatitudes (25º-60º) The midlatitudes include most of Europe and the United States. In this latitude belt, the total ozone amount in the atmosphere has decreased significantly between 1979 and 1991, with estimated linear downward trends of 4.0%, 1.8%, and 3.8% per decade, respectively, for northern midlatitudes in winter/spring, northern midlatitudes in summer/fall, and southern midlatitudes year round. However, since 1991 the linear trend observed during the 1980s has not continued, but rather total column ozone has been almost constant at midlatitudes in both hemispheres. The observed ozone losses from 1979 to the period 1994-1997 are about 5.4%, 2.8%, and 5.0%, respectively, for northern midlatitudes in winter/spring, summer/fall, and southern midlatitudes ye
