| Code | city | 19/03 | 20/03 | 21/03 | 22/03 | 23/03 | 24/03 | 25/03 | 26/03 | 27/03 | 28/03 | 29/03 | 30/03 | 31/03 | 01/04 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 95 | 104 | 86 | 92 | 87 | 74 | 86 | 58 | 60 | 68 | 69 | 80 | 74 | 83 | |
| 41MEU1 | Neder-Over-Heembeek | 93 | 93 | 85 | 94 | 86 | 75 | 89 | 57 | 60 | 66 | 72 | 82 | 77 | 82 | |
| 41N043 | Voorhaven (Haren) | 82 | 85 | 76 | 84 | 76 | 77 | 81 | 57 | 55 | 62 | 72 | 82 | 75 | 82 | |
| 41R001 | Sint-Jans-Molenbeek | 88 | 86 | 81 | 85 | 82 | 66 | 77 | 50 | 49 | 58 | 59 | 74 | 67 | 80 | |
| 41R012 | Ukkel | 94 | 94 | 86 | 89 | 84 | 77 | 92 | 59 | 60 | 70 | 74 | 85 | 78 | 81 | |
| 42N016 | Dessel | 95 | 110 | 99 | 96 | 85 | 80 | 92 | 66 | 83 | 76 | 77 | 82 | 88 | 87 | |
| 42N027 | Bree | 55 | NA | 91 | 98 | 87 | 84 | 102 | 69 | 86 | 79 | 88 | 87 | 90 | 87 | |
| 42N035 | Aarschot | 101 | 104 | 97 | 100 | 94 | 78 | 97 | 66 | 79 | 80 | 74 | 84 | 85 | 87 | |
| 42N046 | Gellik | 98 | 101 | 98 | 95 | 85 | 78 | 104 | 66 | 87 | 82 | 92 | 87 | 90 | 88 | |
| 42N047 | Hasselt | 102 | 102 | 100 | 100 | 90 | 80 | 103 | 64 | 85 | 82 | 82 | 86 | 90 | 90 | |
| 42R801 | Borgerhout | 42 | NA | 83 | 91 | 84 | 72 | 88 | 64 | 70 | 22 | NA | NA | NA | 81 | |
| 42R811 | Schoten | 99 | 105 | 96 | 98 | 88 | 86 | 90 | 66 | 75 | 72 | 74 | 87 | 84 | 89 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 91 | 87 | 86 | 90 | 88 | 73 | 86 | 52 | 64 | 65 | 71 | 82 | 76 | 83 | |
| 44M705 | Roeselare (Haven) | NA | NA | 68 | 81 | 88 | 91 | 92 | 63 | 88 | 71 | 82 | 91 | 86 | 83 | |
| 44N012 | Moerkerke | NA | NA | 71 | 69 | 72 | 67 | 68 | 44 | 56 | 61 | 66 | 66 | 58 | 77 | |
| 44N029 | Houtem (Veurne) | 89 | 97 | 74 | 73 | 83 | 84 | 71 | 69 | 81 | 63 | 70 | 84 | 88 | 75 | |
| 44R701 | Gent (Baudelopark) | NA | NA | 86 | 90 | 85 | 88 | 95 | 58 | 78 | 66 | 75 | 85 | 79 | 84 | |
| 44R710 | Destelbergen | NA | NA | 89 | 89 | 86 | 80 | 97 | 63 | 82 | 69 | 74 | 84 | 79 | 87 | |
| 43N060 | Havinnes | 87 | 91 | 75 | 85 | 77 | 70 | 88 | 57 | 79 | 67 | 70 | 76 | 83 | 76 | |
| 43N064 | Rixensart | 102 | 104 | 93 | 101 | 93 | 81 | 100 | 69 | 85 | 78 | 80 | 89 | 89 | 93 | |
| 43N066 | Eupen | 96 | 90 | 93 | 92 | 83 | 80 | 98 | 62 | 65 | 93 | 83 | 79 | 80 | 82 | |
| 43N070 | Mons | 86 | 86 | 77 | 84 | 80 | 65 | 85 | 61 | 85 | 69 | 77 | 84 | 85 | 85 | |
| 43N073 | Vezin | NA | NA | 84 | 89 | 82 | 69 | 89 | 53 | 56 | 69 | 66 | 72 | 79 | 83 | |
| 43N085 | Vielsalm | 99 | 92 | 98 | 99 | 86 | 82 | 112 | 72 | 100 | 100 | 91 | 86 | 86 | 89 | |
| 43N093 | Sinsin | NA | NA | 92 | 99 | 89 | 82 | 104 | 64 | 89 | 95 | 89 | 84 | 86 | 87 | |
| 43N100 | Dourbes | 100 | 93 | 92 | 101 | 86 | 80 | 107 | 64 | 93 | 83 | 79 | 87 | 86 | 89 | |
| 43N113 | Saint-Ode | NA | NA | 86 | 95 | 83 | 80 | 102 | 68 | 92 | 99 | 84 | 81 | 82 | 86 | |
| 43N121 | Offagne | NA | NA | 88 | 94 | 81 | 80 | 103 | 65 | 90 | 98 | 85 | 83 | 83 | 87 | |
| 43N132 | Habay-La-Neuve | NA | NA | 76 | 91 | NA | NA | NA | 64 | 88 | 93 | 80 | 78 | 79 | 78 | |
| 43R221 | Herstal | 91 | 92 | 90 | 93 | 84 | 79 | 99 | 58 | 60 | 85 | 87 | 85 | 84 | 85 | |
| 43R222 | Liège (ISSeP) | 97 | 92 | 93 | 95 | 87 | 78 | 99 | 60 | 65 | 74 | 88 | 84 | 83 | 84 | |
| 43R240 | Engis | NA | NA | 91 | 92 | 85 | 78 | 99 | 57 | 57 | 77 | 75 | 80 | 83 | 86 | |
| 43R401 | Namur | NA | NA | 90 | 96 | 91 | 77 | 97 | 58 | 66 | 79 | 74 | 85 | 82 | 81 | |
| 45R502 | Lodelinsart | 94 | 86 | 85 | 94 | 84 | 69 | 83 | 59 | 73 | 69 | 72 | 81 | 84 | 86 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 90 | 93 | 86 | 87 | 83 | 73 | 85 | 58 | 57 | 65 | 69 | 81 | 77 | 83 | ||
| Flanders | 94 | 100 | 88 | 89 | 85 | 80 | 91 | 65 | 76 | 70 | 75 | 84 | 84 | 87 | ||
| Wallonia | 98 | 94 | 89 | 93 | 84 | 76 | 99 | 64 | 82 | 81 | 79 | 82 | 85 | 87 | ||
| Belgium | 97 | 96 | 89 | 91 | 84 | 78 | 95 | 65 | 79 | 76 | 77 | 83 | 84 | 87 | ||
| % 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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