Abstract
The mass flux approach is a good tool to tell whether decisions in pollution control to be taken or already taken are adequate. In policy making, the boundaries for the mass flux approach can be either national borders or catchment areas of river basins. In the following, a nitrogen balance is presented for Austria for the year 1986, including the reason to undertake the work and the type of approach taken. In addition, the nitrogen balance is discussed and some conclusions are drawn on actions required.

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