| Code | city | 22/09 | 23/09 | 24/09 | 25/09 | 26/09 | 27/09 | 28/09 | 29/09 | 30/09 | 01/10 | 02/10 | 03/10 | 04/10 | 05/10 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 75 | 82 | 70 | 75 | 73 | 70 | 67 | 67 | 58 | 68 | 58 | 67 | 63 | 80 | |
| 41MEU1 | Neder-Over-Heembeek | 80 | 81 | 67 | 72 | 66 | 63 | 68 | 69 | 52 | 62 | 60 | 68 | 61 | 80 | |
| 41N043 | Voorhaven (Haren) | 74 | 76 | 66 | 66 | 69 | 66 | 65 | 64 | 55 | 62 | 56 | 67 | 62 | 72 | |
| 41R001 | Sint-Jans-Molenbeek | 74 | 76 | 61 | 70 | 70 | 67 | 60 | 60 | 55 | 59 | 51 | 59 | 58 | 70 | |
| 41R012 | Ukkel | 58 | 56 | NA | 69 | 70 | 69 | 68 | 56 | 56 | 64 | 64 | 68 | 64 | 73 | |
| 42N016 | Dessel | 82 | 97 | 75 | 76 | 71 | 70 | 63 | 78 | 56 | 58 | 58 | 76 | 74 | 81 | |
| 42N027 | Bree | 96 | 96 | 78 | 69 | 72 | 75 | 75 | 69 | 57 | 58 | 45 | 66 | 63 | 73 | |
| 42N035 | Aarschot | 77 | 94 | 77 | 77 | 76 | 72 | 69 | 71 | 61 | 61 | 49 | 71 | 66 | 81 | |
| 42N040 | Sint-Pieters-Leeuw | 70 | 81 | 68 | 74 | 72 | 68 | 69 | 66 | 58 | 70 | 67 | 65 | 67 | 82 | |
| 42N046 | Gellik | 91 | 97 | 85 | 71 | 73 | 81 | 77 | 72 | 61 | 61 | 61 | 68 | 68 | 75 | |
| 42N047 | Hasselt | 95 | 98 | 85 | 71 | 74 | 77 | 76 | 74 | 62 | 62 | 49 | 66 | 65 | 76 | |
| 42R801 | Borgerhout | 63 | 77 | 66 | 73 | 65 | 65 | 69 | 49 | 53 | 53 | 52 | 67 | 60 | 64 | |
| 42R811 | Schoten | 66 | 87 | 75 | 78 | 70 | 66 | 65 | 70 | 54 | 54 | 48 | 69 | 68 | 82 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 74 | 82 | 68 | 77 | 72 | 70 | 67 | 71 | 57 | 57 | 52 | 58 | 58 | 72 | |
| 44M705 | Roeselare (Haven) | 88 | 99 | 88 | 80 | 81 | 74 | 79 | 66 | 62 | 67 | 60 | 81 | 66 | 62 | |
| 44N012 | Moerkerke | 89 | 95 | 89 | 83 | 79 | 78 | 74 | 72 | 58 | 59 | 58 | 78 | 77 | 77 | |
| 44N029 | Houtem (Veurne) | 87 | 96 | 90 | 86 | 79 | 78 | 74 | 72 | 59 | 63 | 65 | 75 | 69 | 72 | |
| 44R701 | Gent (Baudelopark) | 86 | 90 | 79 | 78 | 77 | 72 | 72 | 73 | 58 | 58 | 57 | 74 | 72 | 76 | |
| 44R710 | Destelbergen | 80 | 84 | 78 | 76 | 73 | 68 | 71 | 68 | 56 | 58 | 53 | 72 | 69 | 71 | |
| 43N060 | Havinnes | 74 | 82 | 65 | 67 | 67 | 62 | 73 | 62 | 54 | 71 | 76 | 71 | 72 | 70 | |
| 43N064 | Rixensart | 68 | 90 | 71 | 71 | 72 | 74 | 67 | 72 | 56 | 74 | 75 | 71 | 67 | 80 | |
| 43N066 | Eupen | 94 | 89 | 80 | 69 | 71 | 74 | 72 | 70 | 57 | 62 | 74 | 54 | 52 | 77 | |
| 43N070 | Mons | 63 | 62 | 40 | 54 | 64 | 64 | 68 | 68 | 52 | 59 | 73 | 68 | 76 | 71 | |
| 43N073 | Vezin | 69 | 89 | 74 | 68 | 68 | 73 | 66 | 71 | 60 | 64 | 76 | 58 | 60 | 80 | |
| 43N085 | Vielsalm | 99 | 91 | 75 | 69 | 73 | 70 | 64 | 67 | 52 | 53 | 72 | 62 | 65 | 77 | |
| 43N093 | Sinsin | 78 | 94 | 71 | 68 | 77 | 75 | 74 | 76 | 61 | 70 | 84 | 49 | 50 | 77 | |
| 43N100 | Dourbes | 85 | 92 | 73 | 72 | 74 | 74 | 68 | 74 | 59 | 70 | 76 | 61 | 71 | 74 | |
| 43N113 | Saint-Ode | 98 | 94 | 80 | 81 | 83 | 73 | 74 | 74 | 63 | 64 | 81 | 66 | 58 | 75 | |
| 43N121 | Offagne | 86 | 87 | 77 | 70 | 80 | 72 | 67 | 70 | 60 | 78 | 77 | 70 | 55 | 73 | |
| 43N132 | Habay-La-Neuve | 95 | 84 | 68 | 70 | 80 | 69 | 73 | 61 | 59 | 64 | 82 | 67 | 60 | 75 | |
| 43R221 | Herstal | 93 | 90 | 72 | 64 | 68 | 75 | 73 | 70 | 58 | 61 | 71 | 47 | 53 | 74 | |
| 43R222 | Liège (ISSeP) | 95 | 94 | 79 | 67 | 70 | 76 | 69 | 71 | 60 | 63 | 69 | 49 | 56 | 80 | |
| 43R240 | Engis | 89 | 90 | 69 | 60 | 61 | 73 | 63 | 71 | 52 | 63 | 65 | 51 | 53 | 75 | |
| 43R401 | Namur | 76 | 92 | 71 | 72 | 72 | 75 | 68 | 69 | 61 | 68 | 75 | 50 | 62 | 74 | |
| 45R502 | Lodelinsart | 65 | 84 | 63 | 51 | 60 | 65 | 65 | 71 | 49 | 52 | 75 | 55 | 60 | 77 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 65 | 79 | 65 | 69 | 71 | 70 | 65 | 63 | 56 | 62 | 58 | 65 | 63 | 74 | ||
| Flanders | 79 | 92 | 79 | 78 | 75 | 77 | 72 | 71 | 60 | 66 | 55 | 75 | 70 | 77 | ||
| Wallonia | 81 | 87 | 70 | 67 | 73 | 74 | 68 | 69 | 59 | 65 | 75 | 63 | 62 | 75 | ||
| Belgium | 80 | 90 | 74 | 72 | 74 | 75 | 70 | 70 | 59 | 65 | 66 | 68 | 66 | 76 | ||
| % 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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