Air Quality index, 06/08/2003 - 20/08/2003
| 06/08 | 07/08 | 08/08 | 09/08 | 10/08 | 11/08 | 12/08 | 13/08 | 14/08 | 15/08 | 16/08 | 17/08 | 18/08 | 19/08 | 20/08 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Conurbation | |||||||||||||||
| Brussels | 8 | 8 | 8 | 8 | 9 | 8 | 8 | 7 | 6 | 5 | 6 | 5 | 5 | 4 | 5 |
| Antwerp | 8 | 7 | 7 | 8 | 9 | 8 | 8 | 7 | 5 | 5 | 5 | 4 | 5 | 4 | 6 |
| Ghent | 8 | 8 | 7 | 8 | 9 | 9 | 8 | 7 | 6 | 5 | 6 | 5 | 6 | 4 | 5 |
| Liège | 8 | 7 | 9 | 8 | 8 | 9 | 8 | 8 | 7 | 5 | 6 | 5 | 5 | 5 | 6 |
| Charleroi | 8 | 9 | 9 | NA | 9 | 9 | 8 | 8 | 7 | 6 | 7 | 6 | 5 | 5 | 6 |
| Area | |||||||||||||||
| Coast | 8 | 7 | 6 | 7 | 8 | 9 | 8 | 6 | 4 | 5 | 5 | 5 | 5 | 5 | 5 |
| West-Vlaanderen (south) | 8 | 8 | 6 | 7 | 8 | 9 | 8 | 7 | 5 | 5 | 5 | 5 | 6 | 5 | 5 |
| Ghent canal area | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 5 | NA | 5 | 6 | 6 | 7 |
| Oost-Vlaanderen (south) | 9 | 8 | 8 | 8 | 8 | 9 | 9 | 7 | 7 | 5 | 6 | 4 | 6 | 5 | 6 |
| Antwerp harbour area | 8 | 7 | 7 | 8 | 8 | 8 | 7 | 7 | 4 | 5 | 5 | 4 | 4 | 4 | 5 |
| Kempen - Vlaams-Brabant (east) | 9 | 8 | 8 | 8 | 9 | 8 | 9 | 8 | 6 | 5 | 6 | 5 | 3 | 4 | 6 |
| Limburg | 8 | 7 | 9 | 9 | 9 | 9 | 9 | 8 | 7 | 6 | 6 | 5 | 4 | 5 | 7 |
| Region | |||||||||||||||
| Brussels | 8 | 8 | 8 | 8 | 9 | 8 | 8 | 7 | 6 | 5 | 6 | 5 | 5 | 4 | 5 |
| Flanders | 8 | 7 | 8 | 8 | 8 | 9 | 8 | 7 | 6 | 5 | 6 | 5 | 6 | 4 | 6 |
| Wallonia | 8 | 8 | 9 | 8 | 8 | 8 | 8 | 8 | 7 | 6 | 7 | 6 | 5 | 4 | 6 |
| Country | |||||||||||||||
| Belgium | 8 | 7 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 5 | 6 | 5 | 6 | 4 | 6 |
| 1 | exellent |
| 2 | very good |
| 3 | good |
| 4 | fairly good |
| 5 | moderate |
| 6 | poor |
| 7 | very poor |
| 8 | bad |
| 9 | very bad |
| 10 | horrible |