| Code | city | 15/04 | 16/04 | 17/04 | 18/04 | 19/04 | 20/04 | 21/04 | 22/04 | 23/04 | 24/04 | 25/04 | 26/04 | 27/04 | 28/04 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 93 | 78 | 80 | 85 | 81 | 81 | 83 | 88 | 98 | 82 | 83 | 72 | 86 | 93 | |
| 41MEU1 | Neder-Over-Heembeek | 83 | 78 | 81 | 86 | 82 | 86 | 85 | 88 | 99 | 86 | 79 | 73 | 88 | 88 | |
| 41N043 | Voorhaven (Haren) | 90 | 78 | 80 | 84 | 83 | 83 | 86 | 83 | 91 | 79 | 77 | 68 | 84 | 90 | |
| 41R001 | Sint-Jans-Molenbeek | 80 | 72 | 67 | 72 | 75 | 73 | 74 | 74 | 83 | 77 | 77 | 60 | 84 | 88 | |
| 41R012 | Ukkel | 94 | 81 | 83 | 88 | 83 | 87 | 88 | 93 | 103 | 90 | 83 | 70 | 87 | 90 | |
| 42N016 | Dessel | 91 | 86 | 85 | 92 | 83 | 86 | 91 | 94 | 102 | 89 | 87 | 84 | 95 | 93 | |
| 42N027 | Bree | 97 | 84 | 89 | 90 | 84 | 88 | 86 | 88 | 101 | 86 | 90 | 78 | 90 | 97 | |
| 42N035 | Aarschot | 55 | NA | 85 | 91 | 86 | 89 | 89 | 92 | 102 | 91 | 92 | 77 | 95 | 94 | |
| 42N040 | Sint-Pieters-Leeuw | 95 | 80 | 83 | 87 | 80 | 80 | 83 | 89 | 97 | 88 | 86 | 75 | 88 | 92 | |
| 42N046 | Gellik | 96 | 87 | 87 | 84 | 86 | 89 | 88 | 93 | 97 | 91 | 91 | 79 | 93 | 100 | |
| 42N047 | Hasselt | NA | NA | 84 | 87 | 82 | 85 | 87 | 91 | 97 | 86 | 92 | 78 | 94 | 100 | |
| 42R801 | Borgerhout | 94 | 80 | 83 | 89 | 82 | 85 | 86 | 90 | 95 | 88 | 85 | 79 | 80 | 97 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 83 | 79 | 76 | 82 | 81 | 83 | 84 | 81 | 90 | 85 | 79 | 68 | 92 | 93 | |
| 44M705 | Roeselare (Haven) | 94 | 87 | 83 | 97 | 89 | 94 | 94 | 106 | 101 | 98 | 92 | 82 | 78 | 99 | |
| 44N012 | Moerkerke | 99 | 91 | 86 | 92 | 85 | 89 | 91 | 109 | 100 | 92 | 87 | 87 | 75 | 94 | |
| 44N029 | Houtem (Veurne) | 94 | 88 | 86 | 94 | 87 | 94 | 88 | 104 | 66 | NA | 86 | 93 | 75 | 92 | |
| 44R701 | Gent (Baudelopark) | 92 | 82 | 82 | 90 | 85 | 86 | 86 | 100 | 97 | 88 | 78 | 82 | 77 | 97 | |
| 44R710 | Destelbergen | 91 | 82 | 81 | 91 | 84 | 87 | 90 | 98 | 98 | 90 | 89 | 81 | 79 | 100 | |
| 43N060 | Havinnes | 79 | 74 | 80 | 89 | 79 | 84 | 84 | 99 | 95 | 87 | 88 | 72 | 74 | 89 | |
| 43N064 | Rixensart | 96 | 83 | 85 | 89 | 86 | 88 | 90 | 95 | 104 | 93 | 89 | 77 | 95 | 96 | |
| 43N066 | Eupen | 86 | 78 | 79 | 82 | 79 | 80 | 80 | 89 | 95 | 87 | 84 | 83 | 90 | 99 | |
| 43N070 | Mons | 76 | 75 | 72 | 84 | 79 | 86 | 87 | 93 | 101 | 85 | 74 | 70 | 77 | 81 | |
| 43N073 | Vezin | 96 | 82 | 85 | 87 | 88 | 86 | 85 | 94 | 97 | 91 | 91 | 85 | 95 | 96 | |
| 43N085 | Vielsalm | 92 | 83 | 83 | 84 | 81 | 78 | 83 | 90 | 92 | 90 | 86 | 87 | 91 | 100 | |
| 43N093 | Sinsin | 96 | 86 | 85 | 89 | 89 | 89 | 87 | 92 | 101 | 93 | 91 | 87 | 94 | 101 | |
| 43N100 | Dourbes | 94 | 83 | 87 | 89 | 87 | 89 | 89 | 95 | 106 | 93 | 95 | 92 | 99 | 97 | |
| 43N113 | Saint-Ode | 99 | 84 | 86 | 84 | 83 | 85 | 81 | 88 | 96 | 92 | 89 | 89 | 91 | 96 | |
| 43N121 | Offagne | 96 | 82 | 84 | 85 | 81 | 84 | 81 | 83 | 92 | 90 | 90 | 88 | 93 | 97 | |
| 43N132 | Habay-La-Neuve | 96 | 83 | 87 | 86 | 83 | 88 | 83 | 82 | 92 | 94 | 90 | 88 | 91 | 94 | |
| 43R221 | Herstal | 86 | 81 | 80 | 84 | 83 | 83 | 80 | 89 | 97 | 86 | 84 | 81 | 90 | 98 | |
| 43R222 | Liège (ISSeP) | 86 | 78 | 79 | 84 | 81 | 82 | 77 | 84 | 99 | 84 | 83 | 80 | 91 | 97 | |
| 43R240 | Engis | 85 | 75 | 78 | 84 | 81 | 87 | 84 | 87 | 93 | 81 | 87 | 71 | 93 | 96 | |
| 43R401 | Namur | 93 | 84 | 82 | 84 | 88 | 81 | 80 | 88 | 96 | 86 | 90 | 85 | 92 | 93 | |
| 45R502 | Lodelinsart | 79 | 70 | 71 | 77 | 78 | 83 | 84 | 91 | 94 | 82 | 83 | 69 | 91 | 92 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 89 | 78 | 78 | 84 | 81 | 81 | 83 | 87 | 99 | 83 | 83 | 70 | 87 | 90 | ||
| Flanders | 96 | 87 | 86 | 93 | 88 | 88 | 90 | 98 | 103 | 95 | 90 | 82 | 83 | 97 | ||
| Wallonia | 92 | 80 | 83 | 86 | 82 | 85 | 84 | 91 | 98 | 90 | 89 | 81 | 89 | 95 | ||
| Belgium | 94 | 83 | 84 | 90 | 85 | 86 | 87 | 94 | 100 | 92 | 90 | 82 | 86 | 96 | ||
| % 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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