O3, last 14 days

O₃ concentrations per day (µg/m³), 16/02/2026 - 01/03/2026

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 16/02 17/02 18/02 19/02 20/02 21/02 22/02 23/02 24/02 25/02 26/02 27/02 28/02 01/03

41B011 Sint-Agatha-Berchem 63 NA NA NA 72 77 72 80 60 62.5 74 70.5 79 79.5

41MEU1 Neder-Over-Heembeek 73 74 70 57 71.5 67 67.5 76.5 48 63 70 68 74.5 77.5

41N043 Voorhaven (Haren) 67 69.5 62.5 NA 66 66 65 72 49 48 64.5 62 69.5 73.5

41R001 Sint-Jans-Molenbeek 58 58 58 48 60.5 60.5 58 65 48 50.5 60 61.5 70.5 73.5

41R012 Ukkel 74.5 73 69 54 70 74.5 70.5 77 56 63.5 76.5 74 79 82

42N016 Dessel 67.5 74.5 68 58.5 61.5 65 62.5 75 54 58.5 68 75 72.5 75.5

42N027 Bree 71.5 81.5 67.5 63 70 76 74 85 71 66 80.5 88.5 84.5 85

42N035 Aarschot 73 76 62 53.5 71 76 67.5 77 64 62 78.5 78.5 79 81

42N040 Sint-Pieters-Leeuw 73.5 75.5 72 58 72.5 78.5 72 77 63 65.5 72.5 70.5 76 79

42N046 Gellik 73 72.5 62 54 67 77.5 70 81 66 64.5 78 88 81 80.5

42N047 Hasselt 71.5 76.5 65 53.5 69.5 76.5 72 80 64.5 63 78.5 83.5 81.5 81

42R801 Borgerhout 67.5 70.5 60 52 66.5 72.5 64 72.5 58 45.5 56.5 62.5 72 77

42R811 Schoten 65 77.5 71 58 73 81 69 80.5 61 57.5 74.5 68 77 82

42R842 Mechelen (Hendrik Speecqvest) 71 75 64 55 72 76 70 73 53.5 57.5 74.5 68 78.5 79.5

44M705 Roeselare (Haven) 71.5 79 66 52 78.5 80 73.5 75.5 61 56.5 78 60 77 74

44N012 Moerkerke 72.5 74 63.5 47.5 76.5 78.5 70.5 78.5 54.5 58.5 75.5 61 73 69

44N029 Houtem (Veurne) 71.5 78 67.5 53 77 75.5 72.5 74 60 54.5 74.5 61.5 74.5 69

44R701 Gent (Baudelopark) 71.5 72.5 40.5 52 72 75.5 68.5 75 55.5 59.5 76.5 65.5 76 73.5

44R710 Destelbergen 74.5 75 68.5 58.5 74.5 77 70.5 78.5 55.5 65.5 82 66 78 76

43N060 Havinnes 77 75 71 51 80 80 71 79.5 61 53 79 58.5 76 77.5

43N064 Rixensart 77.5 80 77.5 56.5 74.5 79.5 72.5 83.5 59.5 66 82.5 81 82.5 85

43N066 Eupen 63 64.5 66.5 53 59 65 58 72.5 59 52.5 71.5 79 79.5 77

43N070 Mons 61 66.5 72 50.5 64.5 68.5 60 64 51 50.5 64.5 62 73 75

43N073 Vezin 74 75.5 75.5 58.5 70.5 76.5 65 78 60 62 75 87.5 81.5 79

43N085 Vielsalm 67 64.5 64.5 53.5 57.5 74 54.5 70 46.5 44 58.5 72 73 73.5

43N093 Sinsin NA 75.5 76 59.5 67.5 78 NA 79.5 59 61.5 72 86.5 84 82.5

43N100 Dourbes 83.5 82.5 79.5 97 75 85.5 72 85.5 66.5 68 78 93.5 87 89

43N113 Saint-Ode 81.5 78 79 61.5 71.5 84 69.5 82.5 65 54.5 71.5 83 82 84

43N121 Offagne 59.5 52.5 67.5 45 48 61.5 38.5 76 40.5 42 56 74 69.5 73

43N132 Habay-La-Neuve NA NA 76 55.5 64.5 69 59.5 74 58.5 42 64.5 76 74 78

43R221 Herstal 65 68.5 71.5 57.5 63.5 72.5 65 75 49.5 58.5 72.5 83 79.5 80

43R222 Liège (ISSeP) 69 70 76.5 62 70.5 71 63 76.5 56.5 68 77 87.5 83 84

43R240 Engis 57.5 66 72.5 52.5 47 56 57 69.5 49 54.5 70.5 79 77.5 77

43R401 Namur NA 76.5 70 56 73.5 77 64.5 78 59 58.5 72.5 86.5 82.5 81

45R502 Lodelinsart 65 64.5 67.5 48 55 67.5 56 64.5 50.5 59 65.5 77 74.5 77

Interpolated spatial average in :

Brussels 68 69 65 53 67 70 66 75 55 58 70 68 75 78

Flanders 73 78 69 56 73 75 70 80 61 62 77 71 80 78

Wallonia 74 72 74 57 65 72 62 78 55 56 71 80 79 79

Belgium 73 75 72 56 68 73 65 79 58 58 74 76 79 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%

Code	city	16/02	17/02	18/02	19/02	20/02	21/02	22/02	23/02	24/02	25/02	26/02	27/02	28/02	01/03
41B011	Sint-Agatha-Berchem	63	NA	NA	NA	72	77	72	80	60	62.5	74	70.5	79	79.5
41MEU1	Neder-Over-Heembeek	73	74	70	57	71.5	67	67.5	76.5	48	63	70	68	74.5	77.5
41N043	Voorhaven (Haren)	67	69.5	62.5	NA	66	66	65	72	49	48	64.5	62	69.5	73.5
41R001	Sint-Jans-Molenbeek	58	58	58	48	60.5	60.5	58	65	48	50.5	60	61.5	70.5	73.5
41R012	Ukkel	74.5	73	69	54	70	74.5	70.5	77	56	63.5	76.5	74	79	82
42N016	Dessel	67.5	74.5	68	58.5	61.5	65	62.5	75	54	58.5	68	75	72.5	75.5
42N027	Bree	71.5	81.5	67.5	63	70	76	74	85	71	66	80.5	88.5	84.5	85
42N035	Aarschot	73	76	62	53.5	71	76	67.5	77	64	62	78.5	78.5	79	81
42N040	Sint-Pieters-Leeuw	73.5	75.5	72	58	72.5	78.5	72	77	63	65.5	72.5	70.5	76	79
42N046	Gellik	73	72.5	62	54	67	77.5	70	81	66	64.5	78	88	81	80.5
42N047	Hasselt	71.5	76.5	65	53.5	69.5	76.5	72	80	64.5	63	78.5	83.5	81.5	81
42R801	Borgerhout	67.5	70.5	60	52	66.5	72.5	64	72.5	58	45.5	56.5	62.5	72	77
42R811	Schoten	65	77.5	71	58	73	81	69	80.5	61	57.5	74.5	68	77	82
42R842	Mechelen (Hendrik Speecqvest)	71	75	64	55	72	76	70	73	53.5	57.5	74.5	68	78.5	79.5
44M705	Roeselare (Haven)	71.5	79	66	52	78.5	80	73.5	75.5	61	56.5	78	60	77	74
44N012	Moerkerke	72.5	74	63.5	47.5	76.5	78.5	70.5	78.5	54.5	58.5	75.5	61	73	69
44N029	Houtem (Veurne)	71.5	78	67.5	53	77	75.5	72.5	74	60	54.5	74.5	61.5	74.5	69
44R701	Gent (Baudelopark)	71.5	72.5	40.5	52	72	75.5	68.5	75	55.5	59.5	76.5	65.5	76	73.5
44R710	Destelbergen	74.5	75	68.5	58.5	74.5	77	70.5	78.5	55.5	65.5	82	66	78	76
43N060	Havinnes	77	75	71	51	80	80	71	79.5	61	53	79	58.5	76	77.5
43N064	Rixensart	77.5	80	77.5	56.5	74.5	79.5	72.5	83.5	59.5	66	82.5	81	82.5	85
43N066	Eupen	63	64.5	66.5	53	59	65	58	72.5	59	52.5	71.5	79	79.5	77
43N070	Mons	61	66.5	72	50.5	64.5	68.5	60	64	51	50.5	64.5	62	73	75
43N073	Vezin	74	75.5	75.5	58.5	70.5	76.5	65	78	60	62	75	87.5	81.5	79
43N085	Vielsalm	67	64.5	64.5	53.5	57.5	74	54.5	70	46.5	44	58.5	72	73	73.5
43N093	Sinsin	NA	75.5	76	59.5	67.5	78	NA	79.5	59	61.5	72	86.5	84	82.5
43N100	Dourbes	83.5	82.5	79.5	97	75	85.5	72	85.5	66.5	68	78	93.5	87	89
43N113	Saint-Ode	81.5	78	79	61.5	71.5	84	69.5	82.5	65	54.5	71.5	83	82	84
43N121	Offagne	59.5	52.5	67.5	45	48	61.5	38.5	76	40.5	42	56	74	69.5	73
43N132	Habay-La-Neuve	NA	NA	76	55.5	64.5	69	59.5	74	58.5	42	64.5	76	74	78
43R221	Herstal	65	68.5	71.5	57.5	63.5	72.5	65	75	49.5	58.5	72.5	83	79.5	80
43R222	Liège (ISSeP)	69	70	76.5	62	70.5	71	63	76.5	56.5	68	77	87.5	83	84
43R240	Engis	57.5	66	72.5	52.5	47	56	57	69.5	49	54.5	70.5	79	77.5	77
43R401	Namur	NA	76.5	70	56	73.5	77	64.5	78	59	58.5	72.5	86.5	82.5	81
45R502	Lodelinsart	65	64.5	67.5	48	55	67.5	56	64.5	50.5	59	65.5	77	74.5	77

Interpolated spatial average in :
Brussels	68	69	65	53	67	70	66	75	55	58	70	68	75	78
Flanders	73	78	69	56	73	75	70	80	61	62	77	71	80	78
Wallonia	74	72	74	57	65	72	62	78	55	56	71	80	79	79
Belgium	73	75	72	56	68	73	65	79	58	58	74	76	79	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%

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