| Code | city | 10/03 | 11/03 | 12/03 | 13/03 | 14/03 | 15/03 | 16/03 | 17/03 | 18/03 | 19/03 | 20/03 | 21/03 | 22/03 | 23/03 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 53 | 59 | 59 | 60 | 69 | 79 | 78 | 71 | 80 | 77 | 82 | 68 | 64 | 85 | |
| 41MEU1 | Neder-Over-Heembeek | 54 | 51 | 54 | 54 | 66 | 70 | 74 | 70 | 75 | 76 | 76 | 63 | 60 | 78 | |
| 41N043 | Voorhaven (Haren) | 50 | 52 | 54 | 56 | 56 | 70 | 72 | 65 | 69 | 63 | 69 | 58 | 63 | 78 | |
| 41R001 | Sint-Jans-Molenbeek | 43 | 52 | 52 | 52 | 61 | 67 | 65 | 66 | 65 | 65 | 69 | 53 | 54 | 76 | |
| 41R012 | Ukkel | 59 | 56 | 63 | 59 | 69 | 74 | 73 | 69 | 75 | 76 | 78 | 65 | 67 | 85 | |
| 42N016 | Dessel | 63 | 37 | NA | NA | NA | NA | NA | NA | NA | NA | 88 | 62 | 71 | 84 | |
| 42N027 | Bree | 60 | 51 | 59 | 63 | 71 | 78 | 81 | 77 | 60 | NA | NA | NA | NA | NA | |
| 42N035 | Aarschot | 58 | 57 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| 42N040 | Sint-Pieters-Leeuw | 62 | 60 | NA | NA | NA | 74 | 82 | 70 | 79 | 77 | 83 | 68 | 71 | 83 | |
| 42N046 | Gellik | 76 | 62 | 63 | 69 | 72 | 82 | 82 | 78 | 51 | NA | NA | NA | NA | 84 | |
| 42N047 | Hasselt | 67 | 62 | 58 | 60 | 69 | 81 | 80 | 72 | 72 | NA | NA | NA | 64 | 81 | |
| 42R801 | Borgerhout | NA | 57 | 58 | 52 | 63 | 79 | 79 | 62 | 63 | 75 | 78 | 61 | 65 | 80 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 52 | 49 | NA | NA | NA | 78 | 75 | 55 | NA | NA | NA | NA | NA | NA | |
| 44M705 | Roeselare (Haven) | 68 | 61 | 69 | 70 | 64 | 84 | 84 | 64 | 60 | NA | NA | NA | NA | NA | |
| 44N012 | Moerkerke | 53 | 64 | 68 | 74 | 61 | 88 | 90 | 67 | 56 | NA | NA | NA | 74 | 86 | |
| 44N029 | Houtem (Veurne) | 66 | 61 | 78 | 71 | 67 | 85 | 83 | 64 | 58 | NA | NA | NA | NA | NA | |
| 44R701 | Gent (Baudelopark) | 60 | 60 | 62 | 60 | 68 | 82 | 83 | 66 | 83 | 70 | 76 | 73 | 63 | 82 | |
| 44R710 | Destelbergen | 63 | 60 | 65 | 62 | 71 | 85 | 85 | 71 | 88 | 84 | 78 | 74 | 67 | 83 | |
| 43N060 | Havinnes | NA | NA | NA | NA | NA | NA | NA | NA | 77 | 83 | 82 | 58 | 71 | 76 | |
| 43N064 | Rixensart | 68 | 52 | 58 | 60 | 68 | 72 | 76 | 71 | 61 | NA | NA | NA | 70 | NA | |
| 43N066 | Eupen | 69 | 64 | 57 | 56 | 65 | 85 | 75 | 75 | 49 | NA | NA | NA | 67 | 76 | |
| 43N070 | Mons | NA | NA | 53 | 50 | 56 | 67 | 76 | 63 | 65 | 63 | 72 | 46 | 62 | 76 | |
| 43N073 | Vezin | 77 | 62 | 68 | 63 | 72 | 86 | 78 | 75 | 84 | 83 | 90 | 71 | 75 | 87 | |
| 43N085 | Vielsalm | 70 | 68 | 60 | 60 | 59 | 72 | 69 | 71 | 63 | NA | NA | NA | 79 | NA | |
| 43N093 | Sinsin | 65 | 71 | 66 | 67 | 68 | 80 | 75 | 73 | 81 | 84 | 85 | 75 | 92 | 87 | |
| 43N100 | Dourbes | NA | NA | 75 | 65 | 74 | 81 | 77 | 74 | 83 | 85 | 91 | 79 | 87 | 86 | |
| 43N113 | Saint-Ode | 69 | 79 | 71 | 70 | 72 | 85 | 75 | 75 | 86 | 85 | 92 | 82 | 86 | 84 | |
| 43N121 | Offagne | 72 | 77 | 67 | 58 | 63 | 80 | 75 | 71 | 76 | 79 | 88 | 83 | 81 | 84 | |
| 43N132 | Habay-La-Neuve | 72 | 75 | 67 | 60 | 67 | 78 | 75 | 76 | 82 | 86 | 87 | 87 | 88 | 85 | |
| 43R221 | Herstal | 51 | 48 | 54 | 53 | 63 | 75 | 72 | 70 | 44 | NA | NA | NA | 61 | 79 | |
| 43R222 | Liège (ISSeP) | 54 | 50 | 59 | 54 | 69 | 80 | 75 | 75 | 69 | NA | NA | NA | 64 | 79 | |
| 43R240 | Engis | 58 | 47 | 55 | 53 | 70 | 72 | 71 | 69 | 34 | NA | NA | NA | 63 | 76 | |
| 43R401 | Namur | 76 | 63 | 58 | 61 | 67 | 81 | 75 | 70 | 56 | NA | NA | NA | 71 | 83 | |
| 45R502 | Lodelinsart | 79 | 54 | 53 | 54 | 67 | 68 | 72 | 71 | 69 | 72 | 83 | 43 | 61 | 78 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 52 | 55 | 58 | 57 | 66 | 74 | 71 | 69 | 72 | 72 | 76 | 65 | 64 | 80 | ||
| Flanders | 60 | 58 | 65 | 66 | 72 | 84 | 83 | 73 | 82 | 85 | 87 | 73 | 71 | 83 | ||
| Wallonia | 66 | 64 | 63 | 61 | 69 | 78 | 75 | 72 | 79 | 82 | 87 | 71 | 76 | 82 | ||
| Belgium | 64 | 61 | 64 | 63 | 70 | 81 | 78 | 73 | 80 | 83 | 87 | 72 | 74 | 82 | ||
| % 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% | ||
Color legend:
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