Luchtkwaliteitsindex, 17/09/2021 - 01/10/2021
| 17/09 | 18/09 | 19/09 | 20/09 | 21/09 | 22/09 | 23/09 | 24/09 | 25/09 | 26/09 | 27/09 | 28/09 | 29/09 | 30/09 | 01/10 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agglomeratie | |||||||||||||||
| Brussel | 5 | 5 | 4 | 3 | 4 | 4 | 4 | 3 | 4 | 3 | 3 | 4 | 3 | 2 | 3 |
| Antwerpen | 4 | 4 | 4 | 3 | NA | 5 | 4 | 3 | 4 | 3 | 3 | 3 | 3 | 2 | 3 |
| Gent | 4 | 5 | 4 | 3 | NA | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 |
| Luik | 4 | 5 | 4 | 3 | 4 | 3 | 4 | 3 | 4 | 4 | 3 | 3 | 3 | 3 | 4 |
| Charleroi | 4 | 4 | 4 | 3 | 4 | 4 | 3 | 2 | 4 | 3 | 3 | 3 | 2 | 3 | 3 |
| Regio | |||||||||||||||
| Kust | 5 | 5 | 4 | 4 | NA | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 4 | 3 |
| zuid West-Vlaanderen | 4 | 5 | 4 | 4 | NA | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 |
| Gentse Kanaalzone | 4 | 5 | 4 | 4 | NA | 4 | 4 | 3 | 4 | 4 | 4 | 4 | 3 | 3 | 3 |
| zuid Oost-Vlaanderen | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| Antwerps Havengebied | 4 | 5 | 4 | 4 | NA | 4 | 4 | 3 | 4 | 4 | 4 | 4 | 3 | 3 | 3 |
| Kempen - oost Vlaams-Brabant | 5 | 5 | 4 | 3 | NA | 4 | 4 | 3 | 4 | 3 | 3 | 4 | 3 | 3 | 4 |
| Limburg | 5 | 5 | 4 | 3 | NA | 4 | 4 | 3 | 4 | 4 | 3 | 3 | 3 | 3 | 4 |
| Gewest | |||||||||||||||
| Brussel | 5 | 5 | 4 | 3 | 4 | 4 | 4 | 3 | 4 | 3 | 3 | 4 | 3 | 2 | 3 |
| Vlaanderen | 4 | 5 | 4 | 3 | NA | 4 | 4 | 3 | 4 | 4 | 4 | 4 | 3 | 3 | 3 |
| Wallonië | 4 | 5 | 4 | 3 | 4 | 4 | 4 | 3 | 4 | 3 | 3 | 3 | 3 | 3 | 4 |
| Land | |||||||||||||||
| België | 4 | 5 | 4 | 3 | NA | 4 | 4 | 3 | 4 | 3 | 3 | 4 | 3 | 3 | 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 |