The International Cooperative Programme on Integrated Monitoring on Air Pollution Effects (ICP/IM) monitors chemical and biological indicators at the level of catchment areas. The Dutch monitoring area is located at Lheebroekerzand (Province of Drenthe). Since this area is not a catchment, an alternative method had to be developed to calculate the input and output balances of nitrogen. The data were obtained by the National Institute of Public Health and the Environment (RIVM). When the described method was tested with these data, the calculation of input-output balances for nitrogen appeared to be unreliable. It is recommended that data should be collected in a more appropriate way so that the method can be applied reliably.
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