| Code | city | 18/01 | 19/01 | 20/01 | 21/01 | 22/01 | 23/01 | 24/01 | 25/01 | 26/01 | 27/01 | 28/01 | 29/01 | 30/01 | 31/01 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 60 | 57 | 65 | 60 | 79 | 77 | 76 | 61 | 74 | 62 | 53 | 43 | 71 | 76 | |
| 41MEU1 | Neder-Over-Heembeek | 59 | 45 | 53 | 59 | 76 | 71 | 71 | 49 | 74 | 61 | 49 | 41 | 67 | 68 | |
| 41N043 | Voorhaven (Haren) | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | 42 | 66 | 69 | |
| 41R001 | Sint-Jans-Molenbeek | 36 | 50 | 54 | 58 | 71 | 67 | 63 | 41 | 65 | 54 | 42 | 41 | 56 | 71 | |
| 41R012 | Ukkel | 58 | 55 | 64 | 62 | 77 | 74 | 77 | 53 | 76 | 62 | 53 | 52 | 72 | 74 | |
| 42N016 | Dessel | 57 | 48 | 60 | 64 | 62 | 64 | 78 | 55 | 78 | 59 | 61 | 45 | 73 | 74 | |
| 42N027 | Bree | 56 | 55 | 65 | 71 | 82 | 81 | 79 | 61 | 78 | 65 | 41 | 53 | 73 | 79 | |
| 42N035 | Aarschot | 51 | 59 | 64 | 66 | 69 | 68 | 76 | 63 | 74 | 62 | 61 | 50 | 70 | 78 | |
| 42N040 | Sint-Pieters-Leeuw | 69 | 56 | 67 | 61 | 80 | 77 | 77 | 65 | 76 | 63 | 57 | 53 | 74 | 81 | |
| 42N046 | Gellik | 37 | 56 | 63 | NA | 82 | 82 | 80 | 64 | 77 | 70 | 50 | 51 | 72 | 74 | |
| 42N047 | Hasselt | 37 | 58 | 61 | NA | 82 | 81 | 77 | 58 | 77 | 66 | 54 | 53 | 74 | 77 | |
| 42R801 | Borgerhout | 48 | 43 | 52 | 59 | 65 | 53 | 70 | 44 | 68 | 46 | 33 | 30 | 65 | 66 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 40 | 47 | 55 | 61 | 67 | 58 | 70 | 56 | 70 | 52 | 48 | 34 | 56 | 68 | |
| 44M705 | Roeselare (Haven) | 64 | 53 | 55 | 62 | 75 | NA | 75 | 53 | 78 | 63 | 46 | 36 | 68 | 79 | |
| 44N012 | Moerkerke | 71 | 66 | 56 | 64 | 77 | NA | 77 | 57 | 81 | 61 | 47 | 40 | 70 | 81 | |
| 44N029 | Houtem (Veurne) | 75 | 64 | 60 | 64 | 79 | NA | 77 | 54 | 76 | 63 | 42 | 32 | 71 | 77 | |
| 44R701 | Gent (Baudelopark) | 60 | 48 | 57 | 63 | 74 | NA | 75 | 49 | 77 | NA | 45 | 47 | 68 | 76 | |
| 44R710 | Destelbergen | 61 | 49 | 60 | 61 | 69 | NA | 75 | 46 | 76 | 64 | 49 | 48 | 70 | 77 | |
| 43N060 | Havinnes | 60 | 42 | 56 | 56 | 81 | 78 | 78 | 55 | 75 | 62 | 48 | 41 | 74 | 75 | |
| 43N064 | Rixensart | 59 | 54 | 68 | 63 | 81 | 77 | 77 | 59 | 76 | 66 | 57 | 50 | 75 | 80 | |
| 43N066 | Eupen | 40 | 57 | 81 | 77 | 74 | 76 | 72 | 68 | 73 | 62 | 77 | 62 | 66 | 72 | |
| 43N070 | Mons | 58 | 48 | 58 | 59 | 75 | 72 | 72 | 44 | 72 | 55 | 47 | 42 | 66 | 70 | |
| 43N073 | Vezin | 48 | 64 | 71 | 64 | 78 | 77 | 76 | 67 | 76 | 67 | 65 | 59 | 71 | 82 | |
| 43N085 | Vielsalm | 68 | 66 | 69 | 67 | 72 | 75 | 76 | 65 | 71 | 57 | 59 | 52 | 67 | 74 | |
| 43N093 | Sinsin | 52 | 65 | 55 | 64 | 82 | 80 | 82 | 74 | 78 | 65 | 67 | 60 | 76 | 81 | |
| 43N100 | Dourbes | 64 | 67 | 76 | 62 | 81 | 79 | 83 | 71 | 78 | 72 | 65 | 64 | 77 | 85 | |
| 43N113 | Saint-Ode | 65 | 68 | 75 | 69 | 81 | 81 | 81 | 78 | 78 | 69 | 63 | 62 | 78 | 83 | |
| 43N121 | Offagne | 61 | 57 | 58 | 64 | 76 | 77 | 78 | 63 | 73 | 63 | 58 | 60 | 66 | 80 | |
| 43N132 | Habay-La-Neuve | 77 | 57 | 52 | 61 | 77 | 72 | 78 | 60 | 78 | 61 | 43 | 57 | 57 | 81 | |
| 43R221 | Herstal | 33 | 50 | 60 | 63 | 75 | 77 | 71 | 61 | 73 | 60 | 64 | 48 | 59 | 68 | |
| 43R222 | Liège (ISSeP) | 37 | 55 | 69 | 68 | 77 | 76 | 71 | 57 | 73 | 69 | 60 | 56 | 62 | 76 | |
| 43R240 | Engis | 42 | 57 | 69 | 65 | 73 | 77 | 77 | 65 | 73 | 63 | 67 | 53 | 70 | 75 | |
| 43R401 | Namur | 43 | 61 | 63 | 61 | 79 | 78 | 72 | 66 | 74 | 57 | 59 | 48 | 65 | 80 | |
| 45R502 | Lodelinsart | 47 | 53 | 58 | 55 | 67 | 70 | 67 | 50 | 68 | 55 | 53 | 49 | 59 | 71 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 48 | 54 | 59 | 61 | 76 | 73 | 73 | 54 | 71 | 58 | 49 | 46 | 66 | 74 | ||
| Flanders | 55 | 53 | 61 | 65 | 82 | 79 | 85 | 56 | 79 | 63 | 54 | 45 | 74 | 79 | ||
| Wallonia | 53 | 58 | 62 | 64 | 78 | 77 | 80 | 63 | 76 | 64 | 58 | 56 | 68 | 79 | ||
| Belgium | 54 | 56 | 62 | 64 | 79 | 78 | 82 | 60 | 78 | 63 | 56 | 51 | 71 | 79 | ||
| % 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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