| Code | city | 09/03 | 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 115 | 91 | 81 | 69 | 64 | 79 | 73 | 85 | 78 | 80 | 95 | 104 | 86 | 92 | |
| 41MEU1 | Neder-Over-Heembeek | 114 | 87 | 80 | 72 | 63 | 78 | 70 | 83 | 75 | 75 | 93 | 93 | 85 | 94 | |
| 41N043 | Voorhaven (Haren) | 106 | 60 | 76 | 61 | 61 | 75 | 71 | 84 | 73 | 73 | 82 | 85 | 76 | 84 | |
| 41R001 | Sint-Jans-Molenbeek | 100 | 60 | 63 | 55 | 52 | 67 | 62 | 75 | 69 | 69 | 88 | 86 | 81 | 85 | |
| 41R012 | Ukkel | 104 | 72 | 80 | 67 | 65 | 77 | 70 | 85 | 76 | 76 | 94 | 94 | 86 | 89 | |
| 42N016 | Dessel | 123 | 74 | NA | NA | NA | 74 | 73 | 88 | 81 | 81 | 95 | 110 | 99 | 96 | |
| 42N027 | Bree | 119 | 38 | NA | NA | NA | NA | 63 | 88 | 78 | 84 | 55 | NA | 91 | 98 | |
| 42N035 | Aarschot | NA | 71 | NA | NA | NA | NA | NA | NA | NA | 86 | 101 | 104 | 97 | 100 | |
| 42N046 | Gellik | 113 | 44 | NA | NA | NA | 78 | 68 | 87 | 79 | 77 | 98 | 101 | 98 | 95 | |
| 42N047 | Hasselt | 127 | 20 | NA | NA | NA | NA | 72 | 88 | 80 | 83 | 102 | 102 | 100 | 100 | |
| 42R801 | Borgerhout | NA | NA | NA | 69 | 65 | 77 | 71 | 86 | 74 | 77 | 42 | NA | 83 | 91 | |
| 42R811 | Schoten | 119 | 112 | 86 | 81 | 64 | 74 | 74 | 86 | 82 | 84 | 99 | 105 | 96 | 98 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 109 | 76 | 70 | 60 | 67 | 71 | 65 | 79 | 77 | 73 | 91 | 87 | 86 | 90 | |
| 44M705 | Roeselare (Haven) | 107 | 86 | 85 | 75 | 73 | 79 | 70 | 80 | 53 | NA | NA | NA | 68 | 81 | |
| 44N012 | Moerkerke | 108 | 102 | 87 | 75 | 72 | 80 | 67 | 84 | 66 | NA | NA | NA | 71 | 69 | |
| 44N029 | Houtem (Veurne) | 108 | 85 | 96 | 76 | 83 | 89 | 73 | 88 | 81 | 73 | 89 | 97 | 74 | 73 | |
| 44R701 | Gent (Baudelopark) | 112 | 106 | 87 | 76 | 59 | 69 | 72 | 85 | 52 | NA | NA | NA | 86 | 90 | |
| 44R710 | Destelbergen | 118 | 110 | 90 | 80 | 68 | 83 | 73 | 88 | 62 | NA | NA | NA | 89 | 89 | |
| 43N060 | Havinnes | 101 | 55 | NA | NA | NA | 73 | NA | NA | NA | 78 | 87 | 91 | 75 | 85 | |
| 43N064 | Rixensart | 109 | 55 | NA | NA | NA | 85 | 76 | 53 | NA | NA | 102 | 104 | 93 | 101 | |
| 43N066 | Eupen | 113 | 104 | 66 | 74 | 75 | 73 | 63 | 78 | 80 | 85 | 96 | 90 | 93 | 92 | |
| 43N070 | Mons | 103 | 29 | NA | NA | NA | 83 | 55 | NA | NA | NA | 86 | 86 | 77 | 84 | |
| 43N073 | Vezin | 109 | 79 | 65 | 73 | 77 | 78 | 69 | 82 | 46 | NA | NA | NA | 84 | 89 | |
| 43N085 | Vielsalm | 109 | 104 | 69 | 74 | 77 | 72 | 74 | 87 | 87 | 71 | 99 | 92 | 98 | 99 | |
| 43N093 | Sinsin | 107 | 95 | 70 | 76 | 79 | 76 | 68 | 79 | 61 | NA | NA | NA | 92 | 99 | |
| 43N100 | Dourbes | 106 | 62 | NA | NA | NA | NA | NA | NA | NA | NA | 100 | 93 | 92 | 101 | |
| 43N113 | Saint-Ode | 107 | 96 | 69 | 77 | 77 | 68 | 75 | 87 | 62 | NA | NA | NA | 86 | 95 | |
| 43N121 | Offagne | 107 | 88 | 66 | 74 | 73 | 68 | 63 | 88 | 81 | NA | NA | NA | 88 | 94 | |
| 43N132 | Habay-La-Neuve | 108 | 85 | 93 | 77 | 66 | 61 | 74 | 88 | 70 | NA | NA | NA | 76 | 91 | |
| 43R221 | Herstal | NA | 79 | 63 | 70 | 71 | 77 | 60 | 79 | 79 | 85 | 91 | 92 | 90 | 93 | |
| 43R222 | Liège (ISSeP) | 111 | 77 | 61 | 70 | 72 | 78 | 64 | 81 | 79 | 87 | 97 | 92 | 93 | 95 | |
| 43R240 | Engis | NA | NA | NA | NA | NA | NA | NA | NA | 85 | 92 | NA | NA | 91 | 92 | |
| 43R401 | Namur | 94 | 67 | 61 | 69 | 67 | 70 | 65 | 77 | 19 | NA | NA | NA | 90 | 96 | |
| 45R502 | Lodelinsart | 104 | 30 | NA | NA | NA | 76 | 67 | NA | NA | NA | 94 | 86 | 85 | 94 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 105 | 66 | 75 | 64 | 62 | 77 | 70 | 83 | 75 | 77 | 90 | 93 | 86 | 87 | ||
| Flanders | 113 | 92 | 83 | 78 | 73 | 83 | 73 | 87 | 81 | 81 | 94 | 100 | 88 | 89 | ||
| Wallonia | 107 | 86 | 70 | 74 | 73 | 75 | 69 | 84 | 84 | 88 | 98 | 94 | 89 | 93 | ||
| Belgium | 109 | 89 | 76 | 76 | 73 | 78 | 71 | 85 | 83 | 85 | 97 | 96 | 89 | 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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