| Country | Period | River Stations | Very negative | Marginally negative | No change | Marginally positive | Very positive | Sen slope (mg N/m3) | Sen slope (%) |
|---|---|---|---|---|---|---|---|---|---|
| Europe | 1992-2017 | 783 | 583 | 32 | 156 | 1 | 11 | -9.138201793 | -3.467981688 |
| Austria | 1992-2017 | 46 | 29 | 0 | 16 | 0 | 1 | -4.171165102 | -3.262844852 |
| Belgium | 1992-2017 | 28 | 22 | 1 | 5 | 0 | 0 | -50.65554596 | -4.145112481 |
| Bulgaria | 1992-2017 | 50 | 41 | 1 | 8 | 0 | 0 | -30.01120722 | -5.043444574 |
| Estonia | 1992-2017 | 38 | 26 | 3 | 9 | 0 | 0 | -2.95271099 | -2.769286982 |
| Finland | 1992-2017 | 70 | 56 | 3 | 11 | 0 | 0 | -1.428132138 | -3.11406424 |
| France | 1992-2017 | 162 | 138 | 4 | 19 | 0 | 1 | -7.501378276 | -4.380056184 |
| Germany | 1992-2017 | 120 | 118 | 1 | 1 | 0 | 0 | -9.714528207 | -4.577848302 |
| Ireland | 1992-2017 | 4 | 3 | 0 | 1 | 0 | 0 | -0.928665414 | -2.154570538 |
| Latvia | 1992-2017 | 15 | 12 | 1 | 2 | 0 | 0 | -2.513086113 | -2.604197118 |
| Lithuania | 1992-2017 | 24 | 22 | 0 | 2 | 0 | 0 | -15.5456124 | -4.904665211 |
| North Macedonia | 1992-2017 | 9 | 9 | 0 | 0 | 0 | 0 | -19.0159038 | -4.448719332 |
| Norway | 1992-2017 | 44 | 24 | 2 | 16 | 0 | 2 | -0.226096947 | -2.381478717 |
| Slovenia | 1992-2017 | 9 | 8 | 0 | 1 | 0 | 0 | -8.731061926 | -5.873540984 |
| Spain | 1992-2017 | 41 | 14 | 5 | 22 | 0 | 0 | -16.82919845 | -2.519373861 |
| Sweden | 1992-2017 | 110 | 48 | 11 | 43 | 1 | 7 | -0.420830118 | -0.887738818 |
| United Kingdom | 1992-2017 | 13 | 13 | 0 | 0 | 0 | 0 | -3.139905457 | -3.91930091 |
| Europe | 2000-2017 | 1138 | 673 | 61 | 354 | 12 | 38 | -8.9001 | -3.7682 |
| Austria | 2000-2017 | 48 | 20 | 1 | 19 | 4 | 4 | -2.7619 | -2.5116 |
| Belgium | 2000-2017 | 35 | 20 | 3 | 11 | 0 | 1 | -38.6923 | -4.0994 |
| Bulgaria | 2000-2017 | 70 | 29 | 6 | 33 | 0 | 2 | -17.494 | -3.8402 |
| Croatia | 2000-2017 | 23 | 17 | 1 | 5 | 0 | 0 | -4.4309 | -5.4888 |
| Estonia | 2000-2017 | 41 | 25 | 1 | 15 | 0 | 0 | -2.6091 | -3.327 |
| Finland | 2000-2017 | 80 | 64 | 4 | 12 | 0 | 0 | -1.4009 | -4.5556 |
| France | 2000-2017 | 240 | 168 | 12 | 58 | 1 | 1 | -7.9051 | -5.2853 |
| Germany | 2000-2017 | 123 | 91 | 4 | 27 | 1 | 0 | -4.2869 | -3.638 |
| Iceland | 2000-2017 | 1 | 0 | 0 | 1 | 0 | 0 | 0.0 | 0.0 |
| Ireland | 2000-2017 | 33 | 10 | 2 | 20 | 0 | 1 | -0.5234 | -1.1367 |
| Latvia | 2000-2017 | 18 | 7 | 0 | 11 | 0 | 0 | -1.3234 | -1.5939 |
| Lithuania | 2000-2017 | 24 | 8 | 1 | 13 | 0 | 2 | -8.9057 | -2.0363 |
| North Macedonia | 2000-2017 | 19 | 15 | 1 | 2 | 1 | 0 | -16.6959 | -4.7296 |
| Norway | 2000-2017 | 44 | 19 | 3 | 18 | 0 | 4 | -0.1262 | -2.1873 |
| Poland | 2000-2017 | 1 | 1 | 0 | 0 | 0 | 0 | -14.7533 | -5.9245 |
| Romania | 2000-2017 | 101 | 77 | 5 | 19 | 0 | 0 | -30.9024 | -6.8979 |
| Serbia | 2000-2017 | 31 | 16 | 0 | 10 | 1 | 4 | -13.1322 | -4.0674 |
| Slovenia | 2000-2017 | 11 | 8 | 0 | 2 | 0 | 1 | -6.4685 | -5.6555 |
| Spain | 2000-2017 | 70 | 12 | 2 | 38 | 2 | 16 | -5.2117 | 1.5973 |
| Sweden | 2000-2017 | 112 | 55 | 14 | 39 | 2 | 2 | -0.7366 | -2.4302 |
| United Kingdom | 2000-2017 | 13 | 11 | 1 | 1 | 0 | 0 | -2.4938 | -4.6066 |