| countryName | less than 1.4 mg{O2}/L | 1.4-2.0 mg{O2}/L | 2.0-3.0 mg{O2}/L | 3.0-4.0 mg{O2}/L | greater than 4.0 mg{O2}/L |
|---|---|---|---|---|---|
| United Kingdom (566) | 49 | 34 | 14 | 2 | 1 |
| Turkey (2) | 0 | 0 | 0 | 0 | 100 |
| North Macedonia (21) | 0 | 10 | 33 | 14 | 43 |
| Sweden (2) | 0 | 0 | 0 | 50 | 50 |
| Spain (1317) | 8 | 7 | 25 | 17 | 43 |
| Slovenia (16) | 100 | 0 | 0 | 0 | 0 |
| Slovakia (52) | 10 | 33 | 35 | 17 | 6 |
| Serbia (39) | 8 | 46 | 36 | 10 | 0 |
| Romania (129) | 6 | 22 | 29 | 18 | 24 |
| Portugal (79) | 38 | 33 | 14 | 4 | 11 |
| Poland (2065) | 6 | 22 | 34 | 21 | 17 |
| Lithuania (367) | 20 | 30 | 41 | 8 | 1 |
| Latvia (21) | 81 | 19 | 0 | 0 | 0 |
| Kosovo under UNSCR 1244/99 (47) | 0 | 2 | 0 | 11 | 87 |
| Greece (213) | 25 | 12 | 24 | 18 | 21 |
| France (1560) | 65 | 17 | 15 | 2 | 1 |
| Finland (7) | 57 | 29 | 0 | 14 | 0 |
| Estonia (195) | 41 | 47 | 11 | 1 | 1 |
| Czechia (121) | 0 | 22 | 43 | 22 | 12 |
| Cyprus (36) | 67 | 22 | 6 | 0 | 6 |
| Croatia (48) | 27 | 35 | 19 | 4 | 15 |
| Bulgaria (103) | 24 | 28 | 17 | 17 | 13 |
| Belgium (89) | 6 | 40 | 28 | 13 | 12 |
| Austria (71) | 61 | 21 | 18 | 0 | 0 |