Ozone and UV-B monitoring program in Canada

The ground-based ozone monitoring network in Canada began operating in the late 1950s and since then has expanded as a result of the increasing concerns regarding depletion of the ozone layer. Since the late 1980s routine measurements of UV-B radiation have been made in addition to stratospheric ozone. Ozone data from the Canadian network have contributed to the determination of global trends in stratospheric ozone. Real-time measurements of ozone and UV-B are used operationally in the Ozone Watch and UV Index programs which were established in 1992 to advise the Canadian public on the current state of the ozone layer and UV-B radiation. Some results from analysis of ozone and UV-B measurements are given and the Ozone Watch and UV Index programs are described.