O3, last 14 days

O₃ concentrations per day (µg/m³), 02/02/2026 - 15/02/2026

Highest hourly meanHighest 8-hourly mean

- Click on the figures in the table cells to get an evolution graph of daily concentrations
- Click on the date to get an interpolation map
- "NA" means no or not enough data were available

Code city 02/02 03/02 04/02 05/02 06/02 07/02 08/02 09/02 10/02 11/02 12/02 13/02 14/02 15/02

41B011 Sint-Agatha-Berchem 43 58.5 58.5 39 69 69 70.5 46.5 56 79 67.5 64.5 64.5 62.5

41MEU1 Neder-Over-Heembeek 46.5 54 66 36 57.5 71.5 70 44 59 74 65 49 70.5 63.5

41N043 Voorhaven (Haren) 40.5 47.5 56.5 35 56.5 59 63 37.5 46 70 59.5 42 65 56.5

41R001 Sint-Jans-Molenbeek 36 52 51.5 31.5 44.5 59.5 58 40.5 47 64.5 52.5 51 52 56.5

41R012 Ukkel 41 63.5 60.5 41 66 70.5 66.5 51 65.5 79.5 72.5 68.5 69 65

42N016 Dessel 51 58 59 35 54 70 41.5 40.5 51.5 65.5 64 50 71 59

42N027 Bree 56.5 58.5 63 35 67.5 78 47 36.5 57 78 62 48 64 63.5

42N035 Aarschot 46.5 63 64 41 69 71 54 50 61.5 75.5 65.5 47.5 69.5 61.5

42N040 Sint-Pieters-Leeuw 61.5 63.5 61 44.5 76 71 74.5 52 66 85 75 72 67.5 65

42N046 Gellik 45.5 66.5 60 40 65 75.5 50 50.5 60.5 85 68 40 60 62

42N047 Hasselt 45.5 67 65.5 42.5 64.5 77.5 44.5 47.5 63.5 82 66 47.5 64 60

42R801 Borgerhout 38.5 48.5 47.5 24 46 56 47.5 39 42 75.5 57 51 69 58.5

42R811 Schoten 43.5 50.5 60 29.5 50.5 66.5 58.5 37.5 54 46.5 60 51 72.5 62

42R842 Mechelen (Hendrik Speecqvest) 44 52 58.5 41.5 52.5 65.5 57.5 47 56 67 62.5 48.5 70.5 62

44M705 Roeselare (Haven) 42.5 54 49 42 69 76.5 69.5 50 75.5 76 73 52 82 64.5

44N012 Moerkerke 38.5 48.5 55 45 62 71.5 68 50 70 80 67.5 53 80.5 66

44N029 Houtem (Veurne) 54.5 54.5 59 41 73.5 66.5 56 49.5 65.5 80.5 68.5 68.5 82.5 68.5

44R701 Gent (Baudelopark) 47.5 55 59.5 42.5 58 NA 19.5 47 58.5 68.5 64 49.5 76 65.5

44R710 Destelbergen 47.5 56 55 43.5 61 71.5 71.5 52.5 64 76.5 68.5 51 77 69

43N060 Havinnes 47.5 NA NA NA 63 73.5 68 49 69.5 88 77.5 59 78.5 64

43N064 Rixensart 51 NA NA NA 67.5 78 78 55 65.5 85.5 74.5 73.5 76.5 67

43N066 Eupen 56.5 60.5 72.5 60.5 58 70 77 53 63.5 69 64.5 61 54 55

43N070 Mons NA NA NA NA 52.5 60 66.5 42.5 53.5 67.5 65.5 54.5 71 62

43N073 Vezin 52.5 73 71 50 59.5 78.5 78 59.5 NA NA NA 65.5 69 61.5

43N085 Vielsalm 55 58.5 62 48.5 44 60 66 53 51 75.5 69.5 63 53 56.5

43N093 Sinsin 60.5 77 75 51 68 80.5 77.5 61 NA NA NA NA NA NA

43N100 Dourbes 65 NA NA NA 78.5 78.5 57.5 NA 81 91.5 89.5 78.5 73 71

43N113 Saint-Ode 59 79 74 46.5 74 77 81 63.5 NA NA NA 77 57.5 61.5

43N121 Offagne 53 54 54.5 33 37 60 67 51.5 NA NA NA 41 45 54

43N132 Habay-La-Neuve 68 73 48.5 34 65 72 62 57.5 NA NA NA 79.5 54.5 NA

43R221 Herstal 47 61.5 67.5 43 36 70.5 43.5 44.5 58 64 66.5 54.5 54 58.5

43R222 Liège (ISSeP) 51 71 74.5 47.5 55.5 79.5 62 57 70 75 75 56 59.5 62.5

43R240 Engis 42 66.5 70.5 45 44 72.5 70 56 66.5 58.5 57.5 54 59.5 58

43R401 Namur 50.5 70.5 61 45 52.5 75.5 67 58 NA NA NA NA NA NA

45R502 Lodelinsart 40.5 NA NA NA 42.5 68 72 54.5 59.5 71 60 58.5 62.5 60.5

Interpolated spatial average in :

Brussels 42 57 57 38 61 66 64 45 56 74 63 52 63 62

Flanders 46 57 59 40 61 72 60 50 62 78 67 51 74 65

Wallonia 52 65 63 43 60 71 68 58 65 78 74 62 61 61

Belgium 49 61 61 42 60 71 65 54 64 78 71 57 67 63

% 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%

Code	city	02/02	03/02	04/02	05/02	06/02	07/02	08/02	09/02	10/02	11/02	12/02	13/02	14/02	15/02
41B011	Sint-Agatha-Berchem	43	58.5	58.5	39	69	69	70.5	46.5	56	79	67.5	64.5	64.5	62.5
41MEU1	Neder-Over-Heembeek	46.5	54	66	36	57.5	71.5	70	44	59	74	65	49	70.5	63.5
41N043	Voorhaven (Haren)	40.5	47.5	56.5	35	56.5	59	63	37.5	46	70	59.5	42	65	56.5
41R001	Sint-Jans-Molenbeek	36	52	51.5	31.5	44.5	59.5	58	40.5	47	64.5	52.5	51	52	56.5
41R012	Ukkel	41	63.5	60.5	41	66	70.5	66.5	51	65.5	79.5	72.5	68.5	69	65
42N016	Dessel	51	58	59	35	54	70	41.5	40.5	51.5	65.5	64	50	71	59
42N027	Bree	56.5	58.5	63	35	67.5	78	47	36.5	57	78	62	48	64	63.5
42N035	Aarschot	46.5	63	64	41	69	71	54	50	61.5	75.5	65.5	47.5	69.5	61.5
42N040	Sint-Pieters-Leeuw	61.5	63.5	61	44.5	76	71	74.5	52	66	85	75	72	67.5	65
42N046	Gellik	45.5	66.5	60	40	65	75.5	50	50.5	60.5	85	68	40	60	62
42N047	Hasselt	45.5	67	65.5	42.5	64.5	77.5	44.5	47.5	63.5	82	66	47.5	64	60
42R801	Borgerhout	38.5	48.5	47.5	24	46	56	47.5	39	42	75.5	57	51	69	58.5
42R811	Schoten	43.5	50.5	60	29.5	50.5	66.5	58.5	37.5	54	46.5	60	51	72.5	62
42R842	Mechelen (Hendrik Speecqvest)	44	52	58.5	41.5	52.5	65.5	57.5	47	56	67	62.5	48.5	70.5	62
44M705	Roeselare (Haven)	42.5	54	49	42	69	76.5	69.5	50	75.5	76	73	52	82	64.5
44N012	Moerkerke	38.5	48.5	55	45	62	71.5	68	50	70	80	67.5	53	80.5	66
44N029	Houtem (Veurne)	54.5	54.5	59	41	73.5	66.5	56	49.5	65.5	80.5	68.5	68.5	82.5	68.5
44R701	Gent (Baudelopark)	47.5	55	59.5	42.5	58	NA	19.5	47	58.5	68.5	64	49.5	76	65.5
44R710	Destelbergen	47.5	56	55	43.5	61	71.5	71.5	52.5	64	76.5	68.5	51	77	69
43N060	Havinnes	47.5	NA	NA	NA	63	73.5	68	49	69.5	88	77.5	59	78.5	64
43N064	Rixensart	51	NA	NA	NA	67.5	78	78	55	65.5	85.5	74.5	73.5	76.5	67
43N066	Eupen	56.5	60.5	72.5	60.5	58	70	77	53	63.5	69	64.5	61	54	55
43N070	Mons	NA	NA	NA	NA	52.5	60	66.5	42.5	53.5	67.5	65.5	54.5	71	62
43N073	Vezin	52.5	73	71	50	59.5	78.5	78	59.5	NA	NA	NA	65.5	69	61.5
43N085	Vielsalm	55	58.5	62	48.5	44	60	66	53	51	75.5	69.5	63	53	56.5
43N093	Sinsin	60.5	77	75	51	68	80.5	77.5	61	NA	NA	NA	NA	NA	NA
43N100	Dourbes	65	NA	NA	NA	78.5	78.5	57.5	NA	81	91.5	89.5	78.5	73	71
43N113	Saint-Ode	59	79	74	46.5	74	77	81	63.5	NA	NA	NA	77	57.5	61.5
43N121	Offagne	53	54	54.5	33	37	60	67	51.5	NA	NA	NA	41	45	54
43N132	Habay-La-Neuve	68	73	48.5	34	65	72	62	57.5	NA	NA	NA	79.5	54.5	NA
43R221	Herstal	47	61.5	67.5	43	36	70.5	43.5	44.5	58	64	66.5	54.5	54	58.5
43R222	Liège (ISSeP)	51	71	74.5	47.5	55.5	79.5	62	57	70	75	75	56	59.5	62.5
43R240	Engis	42	66.5	70.5	45	44	72.5	70	56	66.5	58.5	57.5	54	59.5	58
43R401	Namur	50.5	70.5	61	45	52.5	75.5	67	58	NA	NA	NA	NA	NA	NA
45R502	Lodelinsart	40.5	NA	NA	NA	42.5	68	72	54.5	59.5	71	60	58.5	62.5	60.5

Interpolated spatial average in :
Brussels	42	57	57	38	61	66	64	45	56	74	63	52	63	62
Flanders	46	57	59	40	61	72	60	50	62	78	67	51	74	65
Wallonia	52	65	63	43	60	71	68	58	65	78	74	62	61	61
Belgium	49	61	61	42	60	71	65	54	64	78	71	57	67	63

% 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%

Color legend: Kleurlegende

These data are not validated : they should not be used for any study whatsoever
The use or publication of the data is allowed only when the source (www.irceline.be) is acknowledged