 The Norwegian Institute for Air Research ( <unk> ) maintains air and atmospheric measurement equipment at Troll . Combined with a similar measuring station , Zeppelin in Ny @-@ Ålesund , Svalbard , Norway . This allows the institute to collect such data from both polar regions . In particular , the facility measures aerosols , organic and inorganic pollution , ozone and ultraviolet ( UV ) radiation . <unk> also creates air samples annually to generate data for trend analysis . The weekly air pollution measurements are compared to equivalent measurements at Zeppelin . Ground measurements are taken of ozone and mercury , two of the greatest pollution threats in the polar regions . Stratosphere measurements are conducted to measure ozone and UV levels , in particular to gain additional information about ozone depletion and the Antarctic ozone hole . 
