Max O3, last 14 days

O₃ concentrations per day (µg/m³), 24/05/2026 - 06/06/2026

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- 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
[O₃]"ozone day" : day with at least one exeedance in Belgium of the EU threshold for information of the public (180 μg/m3)

Code city 24/05 25/05[O₃]
26/05[O₃]
27/05 28/05 29/05 30/05 31/05 01/06 02/06 03/06 04/06 05/06 06/06

41B011 Sint-Agatha-Berchem 126 124.5 177 127 129.5 130 102 94 82 73 66 71.5 60.5 75.5

41MEU1 Neder-Over-Heembeek 123.5 125.5 162.5 122.5 136.5 126.5 94.5 91 80.5 67 59 67 59 74.5

41N043 Voorhaven (Haren) 119 122 145.5 111.5 120 118.5 88 91 75.5 64.5 57.5 64.5 58 68.5

41R001 Sint-Jans-Molenbeek 124 126.5 166 128 130.5 132 103.5 94.5 80.5 69.5 65.5 65 61.5 71.5

41R012 Ukkel 123 131.5 171.5 121 117.5 129 93.5 84.5 78 71 61.5 70 60.5 72.5

42N016 Dessel 121 147 156.5 118.5 141 149 133 119 100.5 75 67 70.5 67 83

42N027 Bree 124.5 148.5 142.5 115 131 147.5 132.5 119 101.5 89 74.5 77.5 71 85.5

42N035 Aarschot 132.5 140.5 140 122 145.5 150 121 106.5 95.5 85.5 74 74.5 71.5 81.5

42N040 Sint-Pieters-Leeuw 121.5 124 166 126.5 126 129.5 110 84.5 81.5 74.5 66.5 70 69.5 78

42N046 Gellik 129 148 147 128.5 129 142 117 111 100 87.5 72.5 80 69 81.5

42N047 Hasselt 128 144.5 143 118.5 138 142.5 115 111.5 96 86 71.5 71 64.5 79.5

42R801 Borgerhout 124 125 188 120.5 68.5 NA 122.5 107 92 74.5 72 72 67.5 77.5

42R811 Schoten 123.5 127.5 180 120 144.5 141.5 133.5 106 95 75.5 76 74.5 65.5 83.5

42R842 Mechelen (Hendrik Speecqvest) 116 121 172 114 133.5 124 101 95.5 80 69.5 64.5 65.5 62.5 77.5

44M705 Roeselare (Haven) 148 186 184.5 153 145 129.5 141 90.5 82 83 72 75.5 91.5 80.5

44N012 Moerkerke 146 159.5 185.5 122 144.5 133 151 90 77.5 80.5 71.5 78.5 90 80

44N029 Houtem (Veurne) 140.5 158.5 194.5 122 147.5 119.5 136.5 80.5 84 81.5 68 73 92 77

44R701 Gent (Baudelopark) 148.5 175 202.5 149.5 149 142.5 141 97.5 89.5 77.5 72.5 74.5 82 81

44R710 Destelbergen 143 172 197.5 147.5 150.5 144 134 96.5 91 80 76 76.5 81.5 80

43N060 Havinnes 117 120 135 135 130 111 168.5 79 76 66 59 59.5 73 70

43N064 Rixensart 114.5 133 145.5 120 127.5 132.5 97 87.5 88 80 70.5 76 68 79.5

43N066 Eupen 117.5 140.5 131 120.5 118 121 101 95.5 88.5 69.5 62.5 69 59 77

43N070 Mons 34.5 NA 147 127 122.5 104.5 94 60 64 58 49 54 49 62.5

43N073 Vezin 124 130 129 135.5 121.5 126 108.5 88 84 74 64.5 69.5 61 76.5

43N085 Vielsalm 109 118 114.5 123 114.5 124.5 70 75.5 79 67 58 58.5 52.5 75

43N093 Sinsin 126 140.5 137 130.5 126 123.5 115.5 93 86.5 78 65.5 66.5 58.5 76

43N100 Dourbes 127 130.5 123 155 126 130.5 131 92.5 88 81.5 72.5 72.5 68 83

43N113 Saint-Ode 109 129 132.5 127.5 117 117.5 112.5 95 84 70.5 66 75.5 58.5 82.5

43N121 Offagne 74.5 NA NA 118.5 117.5 107 112 82.5 NA 64.5 59.5 58 54 76.5

43N132 Habay-La-Neuve 110.5 120.5 136.5 135.5 105.5 120.5 117.5 83.5 83.5 65 61 67.5 57.5 77.5

43R221 Herstal 134.5 148 141 127 119 126.5 110.5 95 95.5 87.5 66 65 61.5 78.5

43R222 Liège (ISSeP) 136.5 147.5 145 134 124 144 107 101.5 96 93 71.5 71 66.5 76

43R240 Engis 130.5 135.5 138.5 127.5 119.5 117 83.5 86.5 83.5 76 60.5 58.5 57.5 68.5

43R401 Namur 118.5 127.5 124 132.5 120.5 125 112.5 92.5 84.5 79 69 72.5 64.5 76

45R502 Lodelinsart 123 131 132 128 133 116 104 NA 75 61 58 57.5 52.5 70.5

Interpolated spatial average in :
Brussels 119 126 157 121 125 128 95 90 80 71 64 69 62 72
Flanders 128 141 160 124 137 132 124 97 88 78 71 73 73 78
Wallonia 110 124 129 129 118 119 112 83 81 70 63 65 60 74
Belgium 118 131 143 126 126 125 117 89 84 73 67 69 66 76

% 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% 13% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Wallonia 0% <1% <1% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0%
Belgium 0% <1% 7% 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	24/05	25/05[O₃]	26/05[O₃]	27/05	28/05	29/05	30/05	31/05	01/06	02/06	03/06	04/06	05/06	06/06
41B011	Sint-Agatha-Berchem	126	124.5	177	127	129.5	130	102	94	82	73	66	71.5	60.5	75.5
41MEU1	Neder-Over-Heembeek	123.5	125.5	162.5	122.5	136.5	126.5	94.5	91	80.5	67	59	67	59	74.5
41N043	Voorhaven (Haren)	119	122	145.5	111.5	120	118.5	88	91	75.5	64.5	57.5	64.5	58	68.5
41R001	Sint-Jans-Molenbeek	124	126.5	166	128	130.5	132	103.5	94.5	80.5	69.5	65.5	65	61.5	71.5
41R012	Ukkel	123	131.5	171.5	121	117.5	129	93.5	84.5	78	71	61.5	70	60.5	72.5
42N016	Dessel	121	147	156.5	118.5	141	149	133	119	100.5	75	67	70.5	67	83
42N027	Bree	124.5	148.5	142.5	115	131	147.5	132.5	119	101.5	89	74.5	77.5	71	85.5
42N035	Aarschot	132.5	140.5	140	122	145.5	150	121	106.5	95.5	85.5	74	74.5	71.5	81.5
42N040	Sint-Pieters-Leeuw	121.5	124	166	126.5	126	129.5	110	84.5	81.5	74.5	66.5	70	69.5	78
42N046	Gellik	129	148	147	128.5	129	142	117	111	100	87.5	72.5	80	69	81.5
42N047	Hasselt	128	144.5	143	118.5	138	142.5	115	111.5	96	86	71.5	71	64.5	79.5
42R801	Borgerhout	124	125	188	120.5	68.5	NA	122.5	107	92	74.5	72	72	67.5	77.5
42R811	Schoten	123.5	127.5	180	120	144.5	141.5	133.5	106	95	75.5	76	74.5	65.5	83.5
42R842	Mechelen (Hendrik Speecqvest)	116	121	172	114	133.5	124	101	95.5	80	69.5	64.5	65.5	62.5	77.5
44M705	Roeselare (Haven)	148	186	184.5	153	145	129.5	141	90.5	82	83	72	75.5	91.5	80.5
44N012	Moerkerke	146	159.5	185.5	122	144.5	133	151	90	77.5	80.5	71.5	78.5	90	80
44N029	Houtem (Veurne)	140.5	158.5	194.5	122	147.5	119.5	136.5	80.5	84	81.5	68	73	92	77
44R701	Gent (Baudelopark)	148.5	175	202.5	149.5	149	142.5	141	97.5	89.5	77.5	72.5	74.5	82	81
44R710	Destelbergen	143	172	197.5	147.5	150.5	144	134	96.5	91	80	76	76.5	81.5	80
43N060	Havinnes	117	120	135	135	130	111	168.5	79	76	66	59	59.5	73	70
43N064	Rixensart	114.5	133	145.5	120	127.5	132.5	97	87.5	88	80	70.5	76	68	79.5
43N066	Eupen	117.5	140.5	131	120.5	118	121	101	95.5	88.5	69.5	62.5	69	59	77
43N070	Mons	34.5	NA	147	127	122.5	104.5	94	60	64	58	49	54	49	62.5
43N073	Vezin	124	130	129	135.5	121.5	126	108.5	88	84	74	64.5	69.5	61	76.5
43N085	Vielsalm	109	118	114.5	123	114.5	124.5	70	75.5	79	67	58	58.5	52.5	75
43N093	Sinsin	126	140.5	137	130.5	126	123.5	115.5	93	86.5	78	65.5	66.5	58.5	76
43N100	Dourbes	127	130.5	123	155	126	130.5	131	92.5	88	81.5	72.5	72.5	68	83
43N113	Saint-Ode	109	129	132.5	127.5	117	117.5	112.5	95	84	70.5	66	75.5	58.5	82.5
43N121	Offagne	74.5	NA	NA	118.5	117.5	107	112	82.5	NA	64.5	59.5	58	54	76.5
43N132	Habay-La-Neuve	110.5	120.5	136.5	135.5	105.5	120.5	117.5	83.5	83.5	65	61	67.5	57.5	77.5
43R221	Herstal	134.5	148	141	127	119	126.5	110.5	95	95.5	87.5	66	65	61.5	78.5
43R222	Liège (ISSeP)	136.5	147.5	145	134	124	144	107	101.5	96	93	71.5	71	66.5	76
43R240	Engis	130.5	135.5	138.5	127.5	119.5	117	83.5	86.5	83.5	76	60.5	58.5	57.5	68.5
43R401	Namur	118.5	127.5	124	132.5	120.5	125	112.5	92.5	84.5	79	69	72.5	64.5	76
45R502	Lodelinsart	123	131	132	128	133	116	104	NA	75	61	58	57.5	52.5	70.5

Interpolated spatial average in :
Brussels	119	126	157	121	125	128	95	90	80	71	64	69	62	72
Flanders	128	141	160	124	137	132	124	97	88	78	71	73	73	78
Wallonia	110	124	129	129	118	119	112	83	81	70	63	65	60	74
Belgium	118	131	143	126	126	125	117	89	84	73	67	69	66	76

% 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%	13%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Wallonia	0%	<1%	<1%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Belgium	0%	<1%	7%	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