Surface ozone measurements are running at The Auroral Observatory, Tromso. In this report measurements throughout the period Nov. 17, 1992 to Jan. 11, 1993 are given. No diurnal variations can be seen, probably due to the lack of sunlight during the polar night. However, peculiar ozone decreases occur normally during the day time when substantial traffic exists in the nearby town, and it is considered that the ozone is depleted through reactions with pollutants such as nitric oxides and hydro carbons. The American ozonometer has proved its reliability through world-wide use, and the Russian ozonometer gives almost identical results. In addition the Russian ozonometer is most userfriendly. The Russian ozonometer is still under development, and our device is a prototype made for testing.
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