Luchtkwaliteitsindex, 02/09/2021 - 16/09/2021
| 02/09 | 03/09 | 04/09 | 05/09 | 06/09 | 07/09 | 08/09 | 09/09 | 10/09 | 11/09 | 12/09 | 13/09 | 14/09 | 15/09 | 16/09 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agglomeratie | |||||||||||||||
| Brussel | 5 | 6 | 4 | 6 | 6 | 6 | 6 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| Antwerpen | 4 | 5 | 4 | 5 | 5 | 6 | 6 | 4 | 2 | 3 | 3 | 4 | 3 | 4 | 4 |
| Gent | 5 | 5 | 4 | 6 | 7 | 6 | 6 | 4 | 4 | 4 | 4 | 4 | 3 | 4 | 4 |
| Luik | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 4 | 3 | 4 | 5 | 4 | 3 | 4 | 4 |
| Charleroi | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 4 | 2 | 2 | 4 | 4 | 3 | 3 | 4 |
| Regio | |||||||||||||||
| Kust | 5 | 5 | 4 | 6 | 7 | 7 | 6 | 4 | 5 | 4 | 4 | 4 | 3 | 5 | 4 |
| zuid West-Vlaanderen | 4 | 4 | 5 | 6 | 5 | 6 | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Gentse Kanaalzone | 5 | 5 | 4 | 6 | 7 | 4 | 6 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| zuid Oost-Vlaanderen | 5 | 6 | 4 | 6 | 6 | 6 | 6 | 5 | 3 | 4 | 4 | 4 | 3 | 4 | 4 |
| Antwerps Havengebied | 5 | 6 | 4 | 5 | 5 | 7 | 7 | 5 | 3 | 3 | 4 | 4 | 3 | 4 | 5 |
| Kempen - oost Vlaams-Brabant | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 5 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| Limburg | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| Gewest | |||||||||||||||
| Brussel | 5 | 6 | 4 | 6 | 6 | 6 | 6 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| Vlaanderen | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| Wallonië | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 5 | 3 | 4 | 4 | 4 | 3 | 3 | 4 |
| Land | |||||||||||||||
| België | 5 | 5 | 4 | 6 | 6 | 6 | 6 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 |
| 1 | uitstekend |
| 2 | zeer goed |
| 3 | goed |
| 4 | vrij goed |
| 5 | gewoon |
| 6 | middelmatig |
| 7 | ondermaats |
| 8 | slecht |
| 9 | zeer slecht |
| 10 | verschrikkelijk slecht |