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Abstract
Krogh and Brandt Rehbergs method for estimation of CO2 in atmospheric air has been investigated and modified. The method is used for continous investigation of the CO2 content of the air in Scandinavia. A permanent net of sampling stations has been established, 6 in Sweden, 4 in Finland, 3 in Norway and 2 in Denmark. The samples are taken three times each month. A simple method of taking air samples is described. Current data for November, December 1954 and January 1955 are published.