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Norway has reduced the anthropogenic discharges of nitrogen to the coastline from the border with Sweden to Lindesnes at the southernmost tip of Norway by 38 per cent since 1985.
Norway has given priority to measures to reduce nitrogen discharges in two areas: from the border with Sweden to Fredrikstad, and in the Inner Oslofjord. Municipal waste water is the main source of nitrogen discharges in the Inner Oslofjord. In this area, two large waste water treatment plants have been upgraded to provide nitrogen removal, reducing nitrogen inputs to the fjord by 60-70 per cent.
Only one municipal waste water treatment plant in the rest of the area Sweden-Lindesnes includes a nitrogen removal process: however, in this area, agriculture is the largest anthropogenic source of nitrogen inputs.
Published by the Climate and Pollution Agency, 19.05.2009, 16:08.