| Code | city | 02/04 | 03/04 | 04/04 | 05/04 | 06/04 | 07/04 | 08/04 | 09/04 | 10/04 | 11/04 | 12/04 | 13/04 | 14/04 | 15/04 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 78 | 81 | 75 | 86 | 92 | 104 | 101 | 102 | 80 | 84 | 67 | 68 | 89 | 94 | |
| 41MEU1 | Neder-Over-Heembeek | 77 | 73 | 70 | 81 | 91 | 108 | 102 | 103 | 81 | 89 | 72 | 76 | 90 | 99 | |
| 41N043 | Voorhaven (Haren) | 65 | 69 | 67 | 78 | 84 | 100 | 95 | 99 | 76 | 80 | 68 | 64 | 82 | 88 | |
| 41R001 | Sint-Jans-Molenbeek | 62 | 70 | 66 | 77 | 81 | 97 | 90 | 94 | 72 | 82 | 66 | 56 | 79 | 90 | |
| 41R012 | Ukkel | 77 | 79 | 75 | 86 | 89 | 109 | 102 | 109 | 82 | 90 | 74 | 74 | 91 | 99 | |
| 42N016 | Dessel | 80 | 87 | 82 | 85 | 98 | 100 | 108 | 112 | 84 | 95 | 78 | 85 | 94 | 107 | |
| 42N027 | Bree | 74 | 77 | NA | NA | NA | 93 | 102 | 112 | 83 | 95 | 84 | 87 | 96 | 108 | |
| 42N035 | Aarschot | 78 | 88 | 84 | 89 | 98 | 107 | 126 | 121 | 84 | 95 | 79 | 91 | 97 | 112 | |
| 42N040 | Sint-Pieters-Leeuw | 75 | 78 | 74 | 83 | 96 | 107 | 107 | 106 | 84 | 86 | 70 | 69 | 91 | 94 | |
| 42N046 | Gellik | 67 | 84 | 83 | 89 | 96 | 97 | 99 | 114 | 84 | 96 | 84 | 91 | 91 | 107 | |
| 42N047 | Hasselt | 79 | 85 | 82 | 89 | 97 | 101 | 120 | 117 | 83 | 94 | 82 | 85 | 92 | 106 | |
| 42R801 | Borgerhout | 78 | 80 | 78 | 86 | 98 | 100 | 113 | 111 | 84 | 88 | 80 | 78 | 95 | 104 | |
| 42R811 | Schoten | 83 | 81 | 82 | 87 | 99 | 105 | 118 | 117 | 84 | 93 | 81 | 82 | 102 | 109 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 74 | 81 | 73 | 82 | 90 | 100 | 106 | 97 | 81 | 90 | 77 | 73 | 87 | 98 | |
| 44M705 | Roeselare (Haven) | 44 | 83 | 86 | 87 | 91 | 109 | 110 | 106 | 91 | 96 | 82 | 79 | 103 | 96 | |
| 44N012 | Moerkerke | 84 | 80 | 81 | 86 | 96 | 96 | 104 | 96 | 89 | 92 | 79 | 82 | 98 | 99 | |
| 44N029 | Houtem (Veurne) | 86 | 75 | 77 | 83 | 91 | 100 | 113 | 101 | 90 | 86 | 79 | 88 | 93 | 77 | |
| 44R701 | Gent (Baudelopark) | 82 | 76 | 78 | 89 | 97 | 103 | 113 | 108 | 86 | 86 | 80 | 71 | 99 | 97 | |
| 44R710 | Destelbergen | 83 | 78 | 80 | 90 | 97 | 106 | 114 | 113 | 85 | 90 | 82 | 75 | 98 | 99 | |
| 43N060 | Havinnes | 73 | 64 | 68 | 71 | 85 | 90 | 108 | 100 | 81 | 79 | 69 | 62 | 89 | 83 | |
| 43N064 | Rixensart | 82 | 86 | 76 | 90 | 96 | 107 | 106 | 112 | 87 | 96 | 75 | 82 | 92 | 105 | |
| 43N066 | Eupen | 66 | 84 | 75 | 83 | 87 | 98 | 90 | 101 | 78 | 92 | 79 | 81 | 92 | 99 | |
| 43N070 | Mons | 78 | 69 | 64 | 79 | 91 | 96 | 111 | 94 | 82 | 75 | 56 | 60 | 87 | 86 | |
| 43N073 | Vezin | 69 | 81 | 77 | 84 | 90 | 99 | 100 | 102 | 84 | 94 | 79 | 77 | 91 | 104 | |
| 43N085 | Vielsalm | 72 | 76 | 66 | 84 | 88 | 96 | 96 | 102 | 85 | 92 | 80 | 89 | 87 | 97 | |
| 43N093 | Sinsin | 66 | 81 | 77 | 89 | 90 | 96 | 99 | 104 | 88 | 90 | 82 | 73 | 89 | 101 | |
| 43N100 | Dourbes | 76 | 86 | 80 | 94 | 95 | 109 | 110 | 113 | 92 | 97 | 88 | 81 | 95 | 110 | |
| 43N113 | Saint-Ode | 86 | 83 | 74 | 93 | 87 | 98 | 96 | 104 | 87 | 86 | 82 | 92 | 87 | 99 | |
| 43N121 | Offagne | 69 | 70 | 48 | 86 | 63 | 85 | 72 | 89 | 65 | 80 | 68 | 73 | 53 | 86 | |
| 43N132 | Habay-La-Neuve | 80 | 78 | 66 | 81 | 91 | 98 | 92 | 103 | 84 | 80 | 81 | 87 | 84 | 88 | |
| 43R221 | Herstal | 61 | 80 | 75 | 87 | 90 | 98 | 93 | 114 | 84 | 96 | 89 | 84 | 85 | 109 | |
| 43R222 | Liège (ISSeP) | 59 | 84 | 78 | 88 | 92 | 101 | 98 | 108 | 85 | 98 | 82 | 85 | 87 | 106 | |
| 43R240 | Engis | 56 | 80 | 74 | 84 | 89 | 99 | 89 | 105 | 82 | 91 | 77 | 81 | 86 | 104 | |
| 43R401 | Namur | 66 | 81 | 78 | 88 | 89 | 91 | 95 | 103 | 88 | 91 | 80 | 78 | 91 | 102 | |
| 45R502 | Lodelinsart | 66 | 72 | 67 | 78 | 85 | 91 | 100 | 96 | 78 | 89 | 66 | 72 | 84 | 95 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 73 | 76 | 71 | 82 | 89 | 102 | 99 | 102 | 79 | 86 | 70 | 70 | 87 | 95 | ||
| Flanders | 78 | 80 | 79 | 85 | 95 | 101 | 108 | 105 | 85 | 90 | 78 | 78 | 95 | 99 | ||
| Wallonia | 69 | 77 | 70 | 83 | 87 | 95 | 96 | 100 | 82 | 86 | 74 | 75 | 84 | 95 | ||
| Belgium | 73 | 79 | 74 | 84 | 91 | 98 | 101 | 102 | 83 | 88 | 76 | 76 | 89 | 97 | ||
| % 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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