| countryName | less than 40 µg N/l | 40-100 µg N/l | 100-200 µg N/l | 200-400 µg N/l | greater than 400 µg N/l |
|---|---|---|---|---|---|
| United Kingdom (974) | 48 | 33 | 11 | 5 | 3 |
| Switzerland (110) | 67 | 27 | 5 | 1 | 0 |
| Sweden (126) | 71 | 22 | 3 | 1 | 2 |
| Spain (1013) | 38 | 35 | 11 | 7 | 10 |
| Slovenia (16) | 88 | 13 | 0 | 0 | 0 |
| Slovakia (16) | 6 | 44 | 31 | 19 | 0 |
| Serbia (36) | 8 | 44 | 42 | 6 | 0 |
| Romania (121) | 21 | 40 | 17 | 10 | 13 |
| Portugal (92) | 35 | 33 | 14 | 8 | 11 |
| Poland (514) | 13 | 32 | 27 | 16 | 12 |
| Norway (179) | 97 | 2 | 1 | 0 | 0 |
| North Macedonia (20) | 20 | 20 | 20 | 20 | 20 |
| Lithuania (299) | 19 | 52 | 21 | 5 | 3 |
| Latvia (19) | 0 | 100 | 0 | 0 | 0 |
| Kosovo (47) | 0 | 0 | 2 | 2 | 96 |
| Italy (804) | 42 | 19 | 11 | 8 | 21 |
| Ireland (181) | 81 | 18 | 1 | 1 | 0 |
| Iceland (3) | 100 | 0 | 0 | 0 | 0 |
| Germany (245) | 15 | 51 | 27 | 4 | 2 |
| France (1551) | 63 | 27 | 7 | 2 | 1 |
| Finland (106) | 88 | 11 | 1 | 0 | 0 |
| Estonia (92) | 63 | 35 | 2 | 0 | 0 |
| Czechia (849) | 10 | 36 | 24 | 14 | 16 |
| Cyprus (25) | 80 | 8 | 4 | 4 | 4 |
| Croatia (48) | 75 | 17 | 4 | 2 | 2 |
| Bulgaria (109) | 23 | 30 | 26 | 12 | 9 |
| Belgium (99) | 17 | 13 | 12 | 20 | 37 |
| Austria (77) | 68 | 25 | 6 | 0 | 1 |
| Albania (26) | 31 | 8 | 19 | 8 | 35 |
| Europe (7797) | 42 | 30 | 13 | 7 | 9 |