| Country | Period | Monitoring sites | Very negative | Marginally negative | No change | Marginally positive | Very positive | Sen slope (mg/l NO3) | Sen slope (%) |
|---|---|---|---|---|---|---|---|---|---|
| Europe | 1992-2018 | 966 | 403 | 36 | 385 | 23 | 119 | -0.01 | -0.02 |
| Albania | 1992-2018 | 2 | 0 | 0 | 2 | 0 | 0 | -0.03 | -4.3 |
| Austria | 1992-2018 | 39 | 21 | 1 | 17 | 0 | 0 | -0.02 | -0.8 |
| Belgium | 1992-2018 | 26 | 12 | 2 | 12 | 0 | 0 | -0.04 | -0.9 |
| Czechia | 1992-2018 | 19 | 16 | 0 | 3 | 0 | 0 | -0.04 | -1.3 |
| Denmark | 1992-2018 | 37 | 37 | 0 | 0 | 0 | 0 | -0.14 | -2.5 |
| Estonia | 1992-2018 | 38 | 5 | 1 | 14 | 1 | 17 | 0.01 | 0.8 |
| Finland | 1992-2018 | 65 | 15 | 2 | 39 | 2 | 7 | 0.0 | -0.2 |
| France | 1992-2018 | 180 | 33 | 5 | 102 | 7 | 33 | 0.0 | 0.1 |
| Germany | 1992-2018 | 120 | 107 | 0 | 13 | 0 | 0 | -0.05 | -1.4 |
| Ireland | 1992-2018 | 4 | 1 | 0 | 2 | 1 | 0 | -0.01 | -0.1 |
| Latvia | 1992-2018 | 12 | 6 | 3 | 3 | 0 | 0 | -0.02 | -1.9 |
| Lithuania | 1992-2018 | 22 | 3 | 0 | 13 | 1 | 5 | 0.02 | 0.9 |
| Norway | 1992-2018 | 82 | 38 | 6 | 34 | 0 | 4 | 0.0 | -1.2 |
| Poland | 1992-2018 | 4 | 2 | 0 | 1 | 0 | 1 | 0.0 | 0.1 |
| Slovakia | 1992-2018 | 8 | 5 | 0 | 3 | 0 | 0 | -0.02 | -0.9 |
| Slovenia | 1992-2018 | 8 | 2 | 1 | 4 | 1 | 0 | 0.0 | -0.3 |
| Spain | 1992-2018 | 151 | 25 | 6 | 66 | 9 | 45 | 0.02 | 3.5 |
| Sweden | 1992-2018 | 109 | 58 | 9 | 41 | 0 | 1 | -0.01 | -1.1 |
| Switzerland | 1992-2018 | 6 | 2 | 0 | 2 | 0 | 2 | 0.0 | 0.0 |
| United Kingdom | 1992-2018 | 36 | 15 | 0 | 16 | 1 | 4 | 0.01 | -0.3 |
| Europe | 2000-2018 | 1390 | 356 | 99 | 801 | 32 | 102 | -0.01 | 0.7 |
| Albania | 2000-2018 | 7 | 7 | 0 | 0 | 0 | 0 | -0.06 | -8.4 |
| Austria | 2000-2018 | 41 | 2 | 9 | 30 | 0 | 0 | -0.01 | -0.6 |
| Belgium | 2000-2018 | 34 | 16 | 4 | 14 | 0 | 0 | -0.05 | -1.2 |
| Cyprus | 2000-2018 | 13 | 9 | 1 | 3 | 0 | 0 | -0.07 | -5.3 |
| Czechia | 2000-2018 | 19 | 11 | 3 | 5 | 0 | 0 | -0.03 | -1.1 |
| Denmark | 2000-2018 | 38 | 32 | 3 | 3 | 0 | 0 | -0.1 | -2.2 |
| Estonia | 2000-2018 | 40 | 3 | 1 | 27 | 3 | 6 | 0.01 | 0.6 |
| Finland | 2000-2018 | 76 | 14 | 7 | 49 | 1 | 5 | 0.0 | -0.6 |
| France | 2000-2018 | 238 | 16 | 10 | 174 | 8 | 30 | 0.0 | 0.1 |
| Germany | 2000-2018 | 124 | 84 | 6 | 32 | 1 | 1 | -0.04 | -1.1 |
| Iceland | 2000-2018 | 1 | 1 | 0 | 0 | 0 | 0 | 0.0 | -4.4 |
| Ireland | 2000-2018 | 50 | 14 | 5 | 29 | 1 | 1 | -0.01 | -1.2 |
| Latvia | 2000-2018 | 16 | 3 | 1 | 8 | 2 | 2 | 0.01 | 0.1 |
| Lithuania | 2000-2018 | 24 | 2 | 0 | 16 | 2 | 4 | 0.03 | 0.9 |
| North Macedonia | 2000-2018 | 19 | 5 | 3 | 11 | 0 | 0 | -0.02 | -1.5 |
| Norway | 2000-2018 | 89 | 19 | 5 | 55 | 3 | 7 | 0.0 | -0.4 |
| Poland | 2000-2018 | 5 | 1 | 0 | 4 | 0 | 0 | 0.01 | 0.9 |
| Romania | 2000-2018 | 99 | 17 | 14 | 58 | 3 | 7 | -0.01 | -0.7 |
| Serbia | 2000-2018 | 34 | 14 | 4 | 15 | 0 | 1 | -0.02 | -1.2 |
| Slovakia | 2000-2018 | 8 | 2 | 0 | 6 | 0 | 0 | -0.01 | -0.8 |
| Slovenia | 2000-2018 | 10 | 3 | 1 | 6 | 0 | 0 | -0.01 | -0.7 |
| Spain | 2000-2018 | 247 | 38 | 12 | 155 | 6 | 36 | -0.01 | 6.9 |
| Sweden | 2000-2018 | 112 | 30 | 9 | 73 | 0 | 0 | 0.0 | -1.3 |
| Switzerland | 2000-2018 | 16 | 4 | 1 | 11 | 0 | 0 | -0.01 | -0.3 |
| United Kingdom | 2000-2018 | 37 | 16 | 0 | 17 | 2 | 2 | 0.02 | 1.0 |