Luchtkwaliteitsindex, 26/07/2021 - 09/08/2021
| 26/07 | 27/07 | 28/07 | 29/07 | 30/07 | 31/07 | 01/08 | 02/08 | 03/08 | 04/08 | 05/08 | 06/08 | 07/08 | 08/08 | 09/08 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agglomeratie | |||||||||||||||
| Brussel | 4 | 5 | 4 | 3 | 4 | 4 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 3 | 2 |
| Antwerpen | 4 | 4 | 3 | 3 | 3 | 4 | 3 | 4 | 4 | 4 | 5 | 3 | 3 | 3 | 2 |
| Gent | 4 | 4 | 3 | 3 | 3 | 4 | 3 | 4 | 4 | 5 | 5 | 4 | 3 | 3 | 2 |
| Luik | 4 | 4 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 5 | 4 | 3 | NA | NA | 2 |
| Charleroi | 4 | 4 | 3 | 2 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | NA | NA | 2 |
| Regio | |||||||||||||||
| Kust | 5 | 4 | 4 | 3 | 4 | 4 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 4 | 3 |
| zuid West-Vlaanderen | 4 | 4 | 4 | 3 | 3 | 4 | 3 | 4 | 4 | 5 | 5 | 4 | 3 | 3 | 3 |
| Gentse Kanaalzone | 4 | 4 | 3 | 3 | 3 | 4 | 3 | 4 | 4 | 5 | 5 | 4 | 3 | 3 | 2 |
| zuid Oost-Vlaanderen | 4 | 5 | 4 | 3 | 4 | 4 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 3 | 3 |
| Antwerps Havengebied | 4 | 4 | 3 | 3 | 3 | 4 | 3 | 4 | 5 | 4 | 5 | 4 | 3 | 3 | 2 |
| Kempen - oost Vlaams-Brabant | 4 | 4 | 4 | 3 | 4 | 4 | 3 | 4 | 5 | 5 | 5 | 3 | 3 | 3 | 2 |
| Limburg | 4 | 4 | 4 | 3 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 3 | 3 | 3 | 3 |
| Gewest | |||||||||||||||
| Brussel | 4 | 5 | 4 | 3 | 4 | 4 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 3 | 2 |
| Vlaanderen | 4 | 4 | 3 | 3 | 3 | 4 | 3 | 4 | 4 | 5 | 5 | 4 | 3 | 3 | 2 |
| Wallonië | 4 | 4 | 3 | 3 | 4 | 4 | 3 | 4 | 4 | 4 | 4 | 3 | NA | NA | 3 |
| Land | |||||||||||||||
| België | 4 | 4 | 3 | 3 | 3 | 4 | 3 | 4 | 4 | 5 | 4 | 4 | 3 | 3 | 2 |
| 1 | uitstekend |
| 2 | zeer goed |
| 3 | goed |
| 4 | vrij goed |
| 5 | gewoon |
| 6 | middelmatig |
| 7 | ondermaats |
| 8 | slecht |
| 9 | zeer slecht |
| 10 | verschrikkelijk slecht |