| Code | city | 18/05 | 19/05 | 20/05 | 21/05 | 22/05 | 23/05 | 24/05 | 25/05 | 26/05 | 27/05 | 28/05 | 29/05 | 30/05 | 31/05 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 94 | 124 | 122 | 93 | 93 | 86 | 76 | 85 | 86 | 66 | 90 | 71 | 92 | 104 | |
| 41MEU1 | Neder-Over-Heembeek | 92 | 118 | 114 | 93 | 90 | 86 | 69 | 77 | 78 | 61 | 87 | 62 | 83 | 93 | |
| 41N043 | Voorhaven (Haren) | 90 | 119 | 112 | 93 | 91 | 85 | 72 | 84 | 84 | 69 | 89 | 68 | 91 | 102 | |
| 41R001 | Sint-Jans-Molenbeek | 90 | 117 | 113 | 90 | 82 | 80 | 74 | 81 | 81 | 66 | 85 | 70 | 89 | 104 | |
| 41R012 | Ukkel | 91 | 125 | 127 | 94 | 92 | 88 | 77 | 80 | 85 | 65 | 89 | 68 | 93 | 108 | |
| 42N016 | Dessel | 93 | 111 | 105 | NA | 86 | 84 | 75 | NA | 80 | 68 | 79 | 64 | 89 | 111 | |
| 42N027 | Bree | 102 | 123 | 131 | 105 | 97 | 93 | 91 | 81 | 91 | 72 | 91 | 75 | 93 | 108 | |
| 42N035 | Aarschot | 101 | 123 | 122 | 105 | 92 | 86 | 84 | 84 | 84 | 72 | 88 | 74 | 94 | 116 | |
| 42N040 | Sint-Pieters-Leeuw | 97 | 122 | 124 | 87 | 88 | 87 | 73 | 80 | 83 | 65 | 84 | 68 | 87 | 98 | |
| 42N046 | Gellik | 99 | 124 | 125 | 99 | 95 | 89 | 89 | 82 | 89 | 72 | 90 | 78 | 90 | 97 | |
| 42N047 | Hasselt | 102 | 126 | 127 | 82 | 93 | 90 | 89 | 83 | 89 | 72 | 91 | 77 | 97 | 112 | |
| 42R801 | Borgerhout | 97 | 118 | 113 | 93 | 87 | 85 | 77 | 79 | 70 | 73 | 89 | 68 | 84 | 103 | |
| 42R811 | Schoten | 101 | 116 | 121 | 98 | 86 | 88 | 76 | 77 | 78 | 76 | 88 | 68 | 87 | NA | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 98 | 117 | 110 | 93 | 86 | 82 | 74 | 74 | 73 | 71 | 60 | 31 | 78 | 91 | |
| 44M705 | Roeselare (Haven) | 96 | 109 | 92 | 88 | 81 | 92 | 77 | 87 | 84 | 75 | 94 | 64 | 78 | 94 | |
| 44N012 | Moerkerke | 98 | 102 | 98 | 92 | 84 | 91 | 76 | 86 | 87 | 84 | 93 | 66 | 67 | 61 | |
| 44N029 | Houtem (Veurne) | 96 | 96 | 93 | 87 | 82 | 91 | 75 | 82 | 81 | 77 | 89 | 59 | 68 | 66 | |
| 44R701 | Gent (Baudelopark) | 95 | 109 | 105 | 91 | 82 | 84 | 77 | 84 | 82 | 71 | 92 | 68 | 80 | 102 | |
| 44R710 | Destelbergen | 91 | 110 | 104 | 92 | 83 | 82 | 75 | 83 | 82 | 70 | 90 | 66 | 81 | 100 | |
| 43N060 | Havinnes | 93 | 116 | 113 | 87 | 77 | 84 | 62 | 71 | 72 | 56 | 71 | 52 | 76 | 91 | |
| 43N064 | Rixensart | 102 | 128 | 132 | 102 | 99 | 93 | 86 | 88 | 90 | 70 | 90 | 77 | 96 | 109 | |
| 43N066 | Eupen | 94 | 117 | 127 | 104 | 97 | 89 | 87 | 72 | 80 | 74 | 78 | 71 | 54 | NA | |
| 43N070 | Mons | 94 | 122 | 136 | 91 | 80 | 88 | 70 | 72 | 71 | 57 | 64 | 59 | 76 | 82 | |
| 43N073 | Vezin | 94 | 117 | 129 | 103 | 98 | 90 | 86 | 81 | 85 | 74 | 79 | 74 | 84 | 87 | |
| 43N085 | Vielsalm | 91 | 113 | 121 | 107 | 92 | 92 | 90 | 54 | 76 | 79 | 65 | 68 | 64 | 74 | |
| 43N093 | Sinsin | 93 | 115 | 134 | 106 | 95 | 96 | 86 | 82 | 86 | 78 | 82 | 77 | 75 | 93 | |
| 43N100 | Dourbes | 95 | 119 | 126 | 98 | 82 | 89 | 84 | 82 | 83 | 69 | 85 | 77 | 75 | 88 | |
| 43N113 | Saint-Ode | 88 | 105 | 131 | 105 | 90 | 90 | 89 | 72 | 80 | 82 | 82 | 78 | 76 | 83 | |
| 43N121 | Offagne | 97 | 109 | 130 | 102 | 82 | 89 | 82 | 68 | 80 | 73 | 82 | 82 | 83 | 83 | |
| 43N132 | Habay-La-Neuve | 88 | 105 | 124 | 107 | 81 | 81 | 88 | 61 | 78 | 74 | 78 | 75 | 69 | 79 | |
| 43R221 | Herstal | 96 | 126 | 131 | 111 | 95 | 91 | 90 | 79 | 84 | 71 | 77 | 74 | 85 | 95 | |
| 43R222 | Liège (ISSeP) | 94 | 121 | 127 | 107 | 96 | 92 | 90 | 81 | 83 | 74 | 78 | 75 | 80 | 97 | |
| 43R240 | Engis | 88 | 124 | 125 | 102 | 92 | 89 | 86 | 77 | 81 | 68 | 75 | 68 | 80 | 88 | |
| 43R401 | Namur | 94 | 117 | 125 | 100 | 90 | 93 | 82 | 82 | 87 | 69 | 78 | 74 | 83 | 98 | |
| 45R502 | Lodelinsart | 93 | 110 | 126 | 90 | 79 | 82 | 78 | 71 | 72 | 57 | 65 | 61 | 73 | 89 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 92 | 121 | 119 | 92 | 88 | 86 | 76 | 81 | 83 | 66 | 86 | 70 | 88 | 103 | ||
| Flanders | 97 | 116 | 115 | 97 | 91 | 91 | 79 | 82 | 89 | 74 | 92 | 70 | 86 | 95 | ||
| Wallonia | 92 | 114 | 126 | 100 | 87 | 90 | 83 | 72 | 81 | 72 | 77 | 73 | 78 | 88 | ||
| Belgium | 94 | 115 | 121 | 99 | 89 | 90 | 81 | 77 | 85 | 73 | 84 | 72 | 82 | 91 | ||
| % 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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