situation with regard to the loss of biodiversity in the Baltic sea caused by eutrophication. These eco-costs seems to be just sufficient to tackle the problem of the high concentrations in the main rivers that enter the Baltic sea by water treatment systems for the effluent of cities bigger than 10.000 inhabitants (Hautakangas et al., 2014).
Note: To avoid double counting, NH3 and NO2 emissions in air have been set to zero in acidification. NH3 via air is allocated to eutrophication, since eutrophication of protected natural areas (‘Natura 2000 habitats’) is a big problem now in the European Union (Netherlands, Belgium, Germany, Denmark). The prevention measure for NH3 is an air scrubber for cattle stables; the prevention costs are 17.2 euro/kg NH3, see (De Pue et al., 2020).
The prevention costs of NOx in air (NOx is also in the eutrophication midpoint list) of these air scrubbers is 6.37 euro per kg, because of the molar weight ratio of 2.7 for both substances. NOx is, however also an important substance in Photochemical Oxidant Formation (‘summer smog’). The way double counting is handled here is dealt with in the adjacent ( next) column.