| Code | city | 12/09 | 13/09 | 14/09 | 15/09 | 16/09 | 17/09 | 18/09 | 19/09 | 20/09 | 21/09 | 22/09 | 23/09 | 24/09 | 25/09 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 55 | 53 | 80 | 98 | 66 | 84 | 88 | 110 | 111 | 113 | 75 | 82 | 70 | 75 | |
| 41MEU1 | Neder-Over-Heembeek | 59 | 59 | 82 | 100 | 61 | 82 | 85 | 106 | 106 | 111 | 80 | 81 | 67 | 72 | |
| 41N043 | Voorhaven (Haren) | 55 | 54 | 81 | 97 | 62 | 81 | 81 | 103 | 107 | 106 | 74 | 76 | 66 | 66 | |
| 41R001 | Sint-Jans-Molenbeek | 49 | 51 | 74 | 91 | 59 | 78 | 80 | 104 | 102 | 104 | 74 | 76 | 61 | 70 | |
| 41R012 | Ukkel | 48 | 50 | 78 | 93 | 62 | 85 | 91 | 113 | 102 | 101 | 58 | 56 | NA | 69 | |
| 42N016 | Dessel | 63 | 66 | 87 | 97 | 68 | 86 | 99 | 110 | 118 | 133 | 82 | 97 | 75 | 76 | |
| 42N027 | Bree | 64 | 72 | 88 | 92 | 80 | 75 | 103 | 101 | 114 | 118 | 96 | 96 | 78 | 69 | |
| 42N035 | Aarschot | 63 | 70 | 91 | 104 | 65 | 86 | 97 | 112 | 120 | 124 | 77 | 94 | 77 | 77 | |
| 42N040 | Sint-Pieters-Leeuw | 58 | 57 | 83 | 99 | 69 | 82 | 89 | 111 | 106 | 112 | 70 | 81 | 68 | 74 | |
| 42N046 | Gellik | 66 | 64 | 91 | 97 | 82 | 70 | 96 | 101 | 110 | 122 | 91 | 97 | 85 | 71 | |
| 42N047 | Hasselt | 65 | 64 | 87 | 96 | 72 | 77 | 102 | 106 | 117 | 128 | 95 | 98 | 85 | 71 | |
| 42R801 | Borgerhout | 55 | 64 | 78 | 94 | 61 | 74 | 80 | 100 | 100 | 110 | 63 | 77 | 66 | 73 | |
| 42R811 | Schoten | 58 | 62 | 83 | 99 | 57 | 76 | 81 | 105 | 109 | 120 | 66 | 87 | 75 | 78 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 55 | 58 | 78 | 96 | 61 | 77 | 79 | 102 | 108 | 112 | 74 | 82 | 68 | 77 | |
| 44M705 | Roeselare (Haven) | 64 | 67 | 95 | 99 | 70 | 86 | 79 | 125 | 103 | 107 | 88 | 99 | 88 | 80 | |
| 44N012 | Moerkerke | 67 | 74 | 91 | 97 | 76 | 71 | 80 | 112 | 108 | 119 | 89 | 95 | 89 | 83 | |
| 44N029 | Houtem (Veurne) | 69 | 72 | 92 | 95 | 75 | 78 | 71 | 83 | 112 | 109 | 87 | 96 | 90 | 86 | |
| 44R701 | Gent (Baudelopark) | 62 | 69 | 89 | 97 | 75 | 77 | 83 | 118 | 109 | 131 | 86 | 90 | 79 | 78 | |
| 44R710 | Destelbergen | 58 | 64 | 80 | 91 | 70 | 77 | 81 | 114 | 109 | 125 | 80 | 84 | 78 | 76 | |
| 43N060 | Havinnes | 59 | 60 | 92 | 101 | 71 | 83 | 89 | 110 | 98 | 113 | 74 | 82 | 65 | 67 | |
| 43N064 | Rixensart | 60 | 57 | 89 | 99 | 58 | 84 | 93 | 114 | 105 | 115 | 68 | 90 | 71 | 71 | |
| 43N066 | Eupen | 52 | NA | 86 | 95 | 82 | 56 | 95 | 109 | 97 | 105 | 94 | 89 | 80 | 69 | |
| 43N070 | Mons | 56 | 60 | 83 | 93 | 68 | 84 | 95 | 117 | 95 | 99 | 63 | 62 | 40 | 54 | |
| 43N073 | Vezin | 59 | 63 | 82 | 90 | 64 | 69 | 93 | 110 | 92 | 103 | 69 | 89 | 74 | 68 | |
| 43N085 | Vielsalm | 55 | 61 | 77 | 85 | 83 | 79 | 101 | 111 | 102 | 106 | 99 | 91 | 75 | 69 | |
| 43N093 | Sinsin | 63 | 67 | 86 | 99 | 84 | 63 | 100 | 105 | 100 | 103 | 78 | 94 | 71 | 68 | |
| 43N100 | Dourbes | 64 | 64 | 83 | 94 | 78 | 72 | 101 | 111 | 98 | 100 | 85 | 92 | 73 | 72 | |
| 43N113 | Saint-Ode | 40 | NA | NA | NA | 85 | 77 | 100 | 108 | 99 | 104 | 98 | 94 | 80 | 81 | |
| 43N121 | Offagne | 62 | 61 | 79 | 93 | 84 | 69 | 101 | 109 | 102 | 98 | 86 | 87 | 77 | 70 | |
| 43N132 | Habay-La-Neuve | 64 | 67 | 78 | 91 | 88 | 86 | 99 | 109 | 108 | 108 | 95 | 84 | 68 | 70 | |
| 43R221 | Herstal | 58 | 60 | 84 | 94 | 72 | 56 | 88 | 94 | 94 | 106 | 93 | 90 | 72 | 64 | |
| 43R222 | Liège (ISSeP) | 62 | 63 | 86 | 95 | 76 | 57 | 93 | 104 | 96 | 106 | 95 | 94 | 79 | 67 | |
| 43R240 | Engis | 61 | 64 | 87 | 93 | 74 | 61 | 92 | 103 | 96 | 100 | 89 | 90 | 69 | 60 | |
| 43R401 | Namur | 63 | 60 | 88 | 96 | 63 | 64 | 89 | 105 | 88 | 101 | 76 | 92 | 71 | 72 | |
| 45R502 | Lodelinsart | 56 | 50 | 79 | 93 | 55 | 69 | 88 | 109 | 91 | 100 | 65 | 84 | 63 | 51 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 53 | 53 | 78 | 94 | 61 | 82 | 87 | 108 | 105 | 106 | 65 | 79 | 65 | 69 | ||
| Flanders | 64 | 67 | 88 | 98 | 72 | 81 | 90 | 109 | 112 | 118 | 79 | 92 | 79 | 78 | ||
| Wallonia | 62 | 63 | 82 | 93 | 77 | 74 | 98 | 110 | 101 | 103 | 81 | 87 | 70 | 67 | ||
| Belgium | 63 | 65 | 85 | 95 | 75 | 77 | 94 | 110 | 106 | 110 | 80 | 90 | 74 | 72 | ||
| % 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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