Monitoring of the atmospheric ozone layer and natural ultraviolet radiation: Annual Report 2021

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This report summarizes the results from the Norwegian monitoring programme on stratospheric ozone and UV radiation measurements.

The ozone layer has been measured at three locations since 1979: In Oslo/Kjeller, Tromsø/Andøya and Ny-Ålesund.

The UV-measurements started in 1995.The results show that there was a significant decrease in stratospheric ozone above Norway between 1979 and 1997.

After that, the ozone layer stabilized at a level ~2% below pre-1980 level.

The year 2021 was characterized by low total ozone values in June and July, whereas “normal” ozone values were measured during winter and spring.