| Code | city | 12/01 | 13/01 | 14/01 | 15/01 | 16/01 | 17/01 | 18/01 | 19/01 | 20/01 | 21/01 | 22/01 | 23/01 | 24/01 | 25/01 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 41B011 | Sint-Agatha-Berchem | 9 | 62 | 34 | 12 | 24 | 16 | 23 | 27 | 18 | 24 | 32 | 61 | 68 | 66 | |
| 41MEU1 | Neder-Over-Heembeek | 13 | 60 | 30 | 3 | 32 | 11 | 19 | 17 | 10 | 15 | 22 | 55 | 62 | 60 | |
| 41N043 | Voorhaven (Haren) | 11 | 49 | 28 | 7 | 29 | 15 | 21 | 19 | 14 | 17 | 26 | 56 | 61 | 60 | |
| 41R001 | Sint-Jans-Molenbeek | 9 | 46 | 25 | 10 | 22 | 17 | 20 | 23 | 18 | 18 | 29 | 57 | 67 | 58 | |
| 41R012 | Ukkel | 8 | 54 | 33 | 10 | 27 | 16 | 22 | 21 | 19 | 21 | 37 | 63 | 72 | 62 | |
| 42N016 | Dessel | 57 | 63 | 26 | 8 | 27 | 20 | 22 | 28 | 12 | 25 | 32 | 60 | 74 | 76 | |
| 42N027 | Bree | 64 | 51 | 36 | 16 | 27 | 15 | 20 | 28 | 21 | 18 | 37 | 65 | 76 | 71 | |
| 42N035 | Aarschot | 28 | 73 | 38 | 12 | 37 | 23 | 26 | 31 | 13 | 29 | 40 | 69 | 84 | 73 | |
| 42N040 | Sint-Pieters-Leeuw | 18 | 66 | 38 | 15 | 38 | 18 | 29 | 30 | 21 | 27 | 43 | 63 | 80 | 70 | |
| 42N046 | Gellik | 39 | 55 | 45 | 23 | 28 | 17 | 23 | 29 | 27 | 13 | 37 | 65 | 82 | 77 | |
| 42N047 | Hasselt | 16 | 54 | 36 | 20 | 22 | 12 | 19 | 31 | 24 | 18 | 34 | 65 | 76 | 66 | |
| 42R801 | Borgerhout | 66 | 47 | 26 | 10 | 23 | 23 | 14 | 20 | 11 | 17 | 9 | 63 | 63 | 66 | |
| 42R811 | Schoten | 62 | 58 | 26 | 10 | 25 | 25 | 16 | 21 | 8 | 17 | 10 | 62 | 64 | 65 | |
| 42R842 | Mechelen (Hendrik Speecqvest) | 9 | 60 | 28 | 13 | 28 | 21 | 18 | 21 | 16 | 18 | 13 | 63 | 66 | 76 | |
| 44M705 | Roeselare (Haven) | 70 | 58 | 37 | 11 | 40 | 42 | 34 | 39 | 34 | 21 | 20 | 70 | 70 | 72 | |
| 44N012 | Moerkerke | 76 | 66 | 39 | 16 | 28 | 40 | 29 | 38 | 23 | 22 | 19 | 71 | 72 | 66 | |
| 44N029 | Houtem (Veurne) | 76 | 68 | 48 | 18 | 44 | 47 | 39 | 46 | 36 | 30 | 32 | 75 | 75 | 78 | |
| 44R701 | Gent (Baudelopark) | 64 | 63 | 27 | 5 | 27 | 37 | 22 | 34 | 20 | 25 | 17 | 67 | 71 | 73 | |
| 44R710 | Destelbergen | 65 | 68 | 29 | 2 | 34 | 37 | 26 | 34 | 20 | 26 | 21 | 66 | 74 | 70 | |
| 43N060 | Havinnes | 28 | 50 | 31 | 2 | 30 | 30 | 29 | 21 | 22 | 20 | 26 | 58 | 63 | 64 | |
| 43N064 | Rixensart | 18 | 66 | 40 | 13 | 34 | 15 | 22 | 23 | 21 | 24 | 30 | 63 | 73 | 67 | |
| 43N066 | Eupen | 44 | 64 | 64 | 31 | 37 | 22 | 11 | 16 | 4 | 58 | 70 | 61 | 68 | 75 | |
| 43N070 | Mons | 14 | 61 | 22 | 3 | 30 | 26 | 23 | 21 | 21 | 23 | 23 | 56 | 60 | 66 | |
| 43N073 | Vezin | 45 | 61 | 34 | 13 | 39 | 7 | 27 | 25 | 15 | 33 | 48 | 65 | 68 | 71 | |
| 43N085 | Vielsalm | 62 | 61 | 69 | 44 | 50 | 30 | 42 | 28 | 57 | 54 | 69 | 61 | 67 | 69 | |
| 43N093 | Sinsin | 54 | 59 | 52 | 28 | 44 | 26 | 30 | 32 | 20 | 31 | 42 | 64 | 69 | 83 | |
| 43N100 | Dourbes | 60 | 63 | 44 | 23 | 49 | 22 | 30 | 18 | 26 | 43 | 50 | 65 | 68 | 76 | |
| 43N113 | Saint-Ode | 71 | 66 | 71 | 61 | 65 | 33 | 37 | 29 | 29 | 63 | 54 | 72 | 69 | 79 | |
| 43N121 | Offagne | 69 | 67 | 58 | 55 | 62 | 29 | 31 | 24 | 21 | 51 | 42 | 63 | 64 | 73 | |
| 43N132 | Habay-La-Neuve | 74 | 71 | 49 | 61 | 58 | 32 | 31 | 24 | 12 | 18 | 44 | 61 | 63 | 61 | |
| 43R221 | Herstal | 30 | 38 | 31 | 16 | 27 | 2 | 10 | 11 | 5 | 33 | 45 | 57 | 63 | 69 | |
| 43R222 | Liège (ISSeP) | 39 | 42 | 36 | 18 | 37 | 13 | 19 | 18 | 15 | 42 | 60 | 66 | 72 | 72 | |
| 43R240 | Engis | 39 | 44 | 43 | 16 | 38 | 4 | 26 | 23 | 12 | 42 | 47 | 61 | 64 | 70 | |
| 43R401 | Namur | 23 | 40 | 28 | 15 | 34 | 3 | 26 | 23 | 17 | 12 | 41 | 64 | 66 | 67 | |
| 45R502 | Lodelinsart | 7 | 45 | 26 | 1 | 20 | 0 | 14 | 11 | 14 | 15 | 32 | 50 | 59 | 55 | |
| Interpolated spatial average in : | ||||||||||||||||
| Brussels | 12 | 53 | 30 | 10 | 27 | 15 | 22 | 22 | 17 | 20 | 30 | 61 | 70 | 60 | ||
| Flanders | 50 | 63 | 36 | 13 | 32 | 28 | 26 | 29 | 22 | 23 | 27 | 67 | 75 | 69 | ||
| Wallonia | 41 | 61 | 45 | 24 | 37 | 22 | 27 | 22 | 20 | 31 | 40 | 63 | 70 | 68 | ||
| Belgium | 45 | 62 | 41 | 19 | 35 | 25 | 27 | 25 | 21 | 28 | 34 | 65 | 72 | 68 | ||
| % 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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