| Code | city | 26/09 | 27/09 | 28/09 | 29/09 | 30/09 | 01/10 | 02/10 | 03/10 | 04/10 | 05/10 | 06/10 | 07/10 | 08/10 | 09/10 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 73 | 70 | 67 | 67 | 58 | 68 | 58 | 67 | 63 | 80 | NA | 67 | 67 | 58 | |
| 41MEU1 | Neder-Over-Heembeek | 66 | 63 | 68 | 69 | 52 | 62 | 60 | 68 | 61 | 80 | 54 | 68 | 67 | 60 | |
| 41N043 | Voorhaven (Haren) | 69 | 66 | 65 | 64 | 55 | 62 | 56 | 67 | 62 | 72 | 49 | 60 | 61 | 58 | |
| 41R001 | Sint-Jans-Molenbeek | 70 | 67 | 60 | 60 | 55 | 59 | 51 | 59 | 58 | 70 | 49 | 62 | 66 | 59 | |
| 41R012 | Ukkel | 70 | 69 | 68 | 56 | 56 | 64 | 64 | 68 | 64 | 73 | 48 | 61 | 56 | 53 | |
| 42N016 | Dessel | 71 | 70 | 63 | 78 | 56 | 58 | 58 | 76 | 74 | 81 | 64 | 57 | NA | NA | |
| 42N027 | Bree | 72 | 75 | 75 | 69 | 57 | 58 | 45 | 66 | 63 | 73 | 51 | 66 | 70 | 68 | |
| 42N035 | Aarschot | 76 | 72 | 69 | 71 | 61 | 61 | 49 | 71 | 66 | 81 | 56 | 53 | NA | NA | |
| 42N040 | Sint-Pieters-Leeuw | 72 | 68 | 69 | 66 | 58 | 70 | 67 | 65 | 67 | 82 | 52 | 67 | 69 | 59 | |
| 42N046 | Gellik | 73 | 81 | 77 | 72 | 61 | 61 | 61 | 68 | 68 | 75 | 60 | 72 | 72 | 77 | |
| 42N047 | Hasselt | 74 | 77 | 76 | 74 | 62 | 62 | 49 | 66 | 65 | 76 | 58 | 69 | 71 | 72 | |
| 42R801 | Borgerhout | 65 | 65 | 69 | 49 | 53 | 53 | 52 | 67 | 60 | 64 | 48 | 63 | 62 | 58 | |
| 42R811 | Schoten | 70 | 66 | 65 | 70 | 54 | 54 | 48 | 69 | 68 | 82 | 56 | 69 | 67 | 60 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 72 | 70 | 67 | 71 | 57 | 57 | 52 | 58 | 58 | 72 | 55 | 64 | 66 | 50 | |
| 44M705 | Roeselare (Haven) | 81 | 74 | 79 | 66 | 62 | 67 | 60 | 81 | 66 | 62 | NA | NA | NA | NA | |
| 44N012 | Moerkerke | 79 | 78 | 74 | 72 | 58 | 59 | 58 | 78 | 77 | 77 | 62 | 64 | NA | NA | |
| 44N029 | Houtem (Veurne) | 79 | 78 | 74 | 72 | 59 | 63 | 65 | 75 | 69 | 72 | 50 | 70 | 67 | 78 | |
| 44R701 | Gent (Baudelopark) | 77 | 72 | 72 | 73 | 58 | 58 | 57 | 74 | 72 | 76 | 62 | 64 | NA | NA | |
| 44R710 | Destelbergen | 73 | 68 | 71 | 68 | 56 | 58 | 53 | 72 | 69 | 71 | 60 | 60 | NA | NA | |
| 43N060 | Havinnes | 67 | 62 | 73 | 62 | 54 | 71 | 76 | 71 | 72 | 70 | 45 | 64 | 54 | 51 | |
| 43N064 | Rixensart | 72 | 74 | 67 | 72 | 56 | 74 | 75 | 71 | 67 | 80 | 48 | 59 | 65 | 67 | |
| 43N066 | Eupen | 71 | 74 | 72 | 70 | 57 | 62 | 74 | 54 | 52 | 77 | 54 | 74 | 62 | 56 | |
| 43N070 | Mons | 64 | 64 | 68 | 68 | 52 | 59 | 73 | 68 | 76 | 71 | 37 | 49 | 58 | 55 | |
| 43N073 | Vezin | 68 | 73 | 66 | 71 | 60 | 64 | 76 | 58 | 60 | 80 | 45 | 59 | 61 | 78 | |
| 43N085 | Vielsalm | 73 | 70 | 64 | 67 | 52 | 53 | 72 | 62 | 65 | 77 | 53 | 71 | 60 | 57 | |
| 43N093 | Sinsin | 77 | 75 | 74 | 76 | 61 | 70 | 84 | 49 | 50 | 77 | 47 | 73 | 63 | 83 | |
| 43N100 | Dourbes | 74 | 74 | 68 | 74 | 59 | 70 | 76 | 61 | 71 | 74 | 49 | 64 | 67 | 82 | |
| 43N113 | Saint-Ode | 83 | 73 | 74 | 74 | 63 | 64 | 81 | 66 | 58 | 75 | 52 | 70 | 62 | 66 | |
| 43N121 | Offagne | 80 | 72 | 67 | 70 | 60 | 78 | 77 | 70 | 55 | 73 | 42 | 67 | 59 | 77 | |
| 43N132 | Habay-La-Neuve | 80 | 69 | 73 | 61 | 59 | 64 | 82 | 67 | 60 | 75 | 39 | 60 | 57 | 56 | |
| 43R221 | Herstal | 68 | 75 | 73 | 70 | 58 | 61 | 71 | 47 | 53 | 74 | 51 | 67 | 59 | 60 | |
| 43R222 | Liège (ISSeP) | 70 | 76 | 69 | 71 | 60 | 63 | 69 | 49 | 56 | 80 | 51 | 65 | 64 | 64 | |
| 43R240 | Engis | 61 | 73 | 63 | 71 | 52 | 63 | 65 | 51 | 53 | 75 | 49 | 65 | 54 | 62 | |
| 43R401 | Namur | 72 | 75 | 68 | 69 | 61 | 68 | 75 | 50 | 62 | 74 | 47 | 66 | 61 | 79 | |
| 45R502 | Lodelinsart | 60 | 65 | 65 | 71 | 49 | 52 | 75 | 55 | 60 | 77 | 42 | 56 | 59 | 67 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 71 | 70 | 65 | 63 | 56 | 62 | 58 | 65 | 63 | 74 | 49 | 62 | 65 | 59 | ||
| Flanders | 75 | 77 | 72 | 71 | 60 | 66 | 55 | 75 | 70 | 77 | 56 | 70 | 69 | 58 | ||
| Wallonia | 73 | 74 | 68 | 69 | 59 | 65 | 75 | 63 | 62 | 75 | 46 | 66 | 62 | 63 | ||
| Belgium | 74 | 75 | 70 | 70 | 59 | 65 | 66 | 68 | 66 | 76 | 51 | 68 | 65 | 61 | ||
| % of the population exposed to O3 concentrations > 180 μg/m³ in: | ||||||||||||||||
| Brussels | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Flanders | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Wallonia | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Belgium | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| % of the population exposed to O3 concentrations > 240 μg/m³ in: | ||||||||||||||||
| Brussels | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Flanders | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Wallonia | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
| Belgium | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | ||
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