O3, last 14 days

O₃ concentrations per day (µg/m³), 12/05/2025 - 25/05/2025

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 12/05 13/05 14/05 15/05 16/05 17/05 18/05 19/05 20/05 21/05 22/05 23/05 24/05 25/05

41B011 Sint-Agatha-Berchem 108 137 144 104 105 100 94 124 122 93 93 86 76 85

41MEU1 Neder-Over-Heembeek 105 132 140 102 105 97 92 118 114 93 90 86 69 77

41N043 Voorhaven (Haren) 96 130 132 101 106 99 90 119 112 93 91 85 72 84

41R001 Sint-Jans-Molenbeek 100 126 136 97 99 93 90 117 113 90 82 80 74 81

41R012 Ukkel 104 139 152 106 109 103 91 125 127 94 92 88 77 80

42N016 Dessel 115 136 123 106 104 97 93 111 105 NA 86 84 75 NA

42N027 Bree 117 148 140 112 113 103 102 123 131 105 97 93 91 81

42N035 Aarschot 113 143 141 109 108 102 101 123 122 105 92 86 84 84

42N040 Sint-Pieters-Leeuw NA NA NA NA 101 96 97 122 124 87 88 87 73 80

42N046 Gellik 113 142 141 111 111 99 99 124 125 99 95 89 89 82

42N047 Hasselt 116 148 142 111 113 102 102 126 127 82 93 90 89 83

42R801 Borgerhout 113 147 132 107 101 95 97 118 113 93 87 85 77 79

42R811 Schoten 118 146 126 107 106 98 101 116 121 98 86 88 76 77

42R842 Mechelen (Hendrik Speecqvest) 107 132 130 102 100 93 98 117 110 93 86 82 74 74

44M705 Roeselare (Haven) 104 140 49 93 98 91 96 109 92 88 81 92 77 87

44N012 Moerkerke 128 136 102 103 102 97 98 102 98 92 84 91 76 86

44N029 Houtem (Veurne) 96 119 99 100 98 93 96 96 93 87 82 91 75 82

44R701 Gent (Baudelopark) 117 139 125 94 97 89 95 109 105 91 82 84 77 84

44R710 Destelbergen 117 138 131 96 99 89 91 110 104 92 83 82 75 83

43N060 Havinnes 87 125 141 92 95 91 93 116 113 87 77 84 62 71

43N064 Rixensart 110 140 156 109 112 106 102 128 132 102 99 93 86 88

43N066 Eupen 100 127 147 107 110 99 94 117 127 104 97 89 87 72

43N070 Mons 81 129 157 96 103 103 94 122 136 91 80 88 70 72

43N073 Vezin 103 133 154 103 112 101 94 117 129 103 98 90 86 81

43N085 Vielsalm 105 115 150 109 113 105 91 113 121 107 92 92 90 54

43N093 Sinsin 111 133 153 109 115 105 93 115 134 106 95 96 86 82

43N100 Dourbes 93 117 150 96 108 100 95 119 126 98 82 89 84 82

43N113 Saint-Ode 108 126 152 103 112 102 88 105 131 105 90 90 89 72

43N121 Offagne 93 106 141 105 110 99 97 109 130 102 82 89 82 68

43N132 Habay-La-Neuve 87 111 142 100 104 97 88 105 124 107 81 81 88 61

43R221 Herstal 100 136 147 108 115 101 96 126 131 111 95 91 90 79

43R222 Liège (ISSeP) 100 138 149 109 114 101 94 121 127 107 96 92 90 81

43R240 Engis 96 129 147 107 112 99 88 124 125 102 92 89 86 77

43R401 Namur 98 119 148 101 108 97 94 117 125 100 90 93 82 82

45R502 Lodelinsart 93 124 150 94 101 98 93 110 126 90 79 82 78 71

Interpolated spatial average in :

Brussels 102 135 142 103 105 98 92 121 119 92 88 86 76 81

Flanders 111 138 126 106 106 97 97 116 115 97 91 91 79 82

Wallonia 98 124 147 103 109 99 92 114 126 100 87 90 83 72

Belgium 104 130 138 104 108 98 94 115 121 99 89 90 81 77

% 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	12/05	13/05	14/05	15/05	16/05	17/05	18/05	19/05	20/05	21/05	22/05	23/05	24/05	25/05
41B011	Sint-Agatha-Berchem	108	137	144	104	105	100	94	124	122	93	93	86	76	85
41MEU1	Neder-Over-Heembeek	105	132	140	102	105	97	92	118	114	93	90	86	69	77
41N043	Voorhaven (Haren)	96	130	132	101	106	99	90	119	112	93	91	85	72	84
41R001	Sint-Jans-Molenbeek	100	126	136	97	99	93	90	117	113	90	82	80	74	81
41R012	Ukkel	104	139	152	106	109	103	91	125	127	94	92	88	77	80
42N016	Dessel	115	136	123	106	104	97	93	111	105	NA	86	84	75	NA
42N027	Bree	117	148	140	112	113	103	102	123	131	105	97	93	91	81
42N035	Aarschot	113	143	141	109	108	102	101	123	122	105	92	86	84	84
42N040	Sint-Pieters-Leeuw	NA	NA	NA	NA	101	96	97	122	124	87	88	87	73	80
42N046	Gellik	113	142	141	111	111	99	99	124	125	99	95	89	89	82
42N047	Hasselt	116	148	142	111	113	102	102	126	127	82	93	90	89	83
42R801	Borgerhout	113	147	132	107	101	95	97	118	113	93	87	85	77	79
42R811	Schoten	118	146	126	107	106	98	101	116	121	98	86	88	76	77
42R842	Mechelen (Hendrik Speecqvest)	107	132	130	102	100	93	98	117	110	93	86	82	74	74
44M705	Roeselare (Haven)	104	140	49	93	98	91	96	109	92	88	81	92	77	87
44N012	Moerkerke	128	136	102	103	102	97	98	102	98	92	84	91	76	86
44N029	Houtem (Veurne)	96	119	99	100	98	93	96	96	93	87	82	91	75	82
44R701	Gent (Baudelopark)	117	139	125	94	97	89	95	109	105	91	82	84	77	84
44R710	Destelbergen	117	138	131	96	99	89	91	110	104	92	83	82	75	83
43N060	Havinnes	87	125	141	92	95	91	93	116	113	87	77	84	62	71
43N064	Rixensart	110	140	156	109	112	106	102	128	132	102	99	93	86	88
43N066	Eupen	100	127	147	107	110	99	94	117	127	104	97	89	87	72
43N070	Mons	81	129	157	96	103	103	94	122	136	91	80	88	70	72
43N073	Vezin	103	133	154	103	112	101	94	117	129	103	98	90	86	81
43N085	Vielsalm	105	115	150	109	113	105	91	113	121	107	92	92	90	54
43N093	Sinsin	111	133	153	109	115	105	93	115	134	106	95	96	86	82
43N100	Dourbes	93	117	150	96	108	100	95	119	126	98	82	89	84	82
43N113	Saint-Ode	108	126	152	103	112	102	88	105	131	105	90	90	89	72
43N121	Offagne	93	106	141	105	110	99	97	109	130	102	82	89	82	68
43N132	Habay-La-Neuve	87	111	142	100	104	97	88	105	124	107	81	81	88	61
43R221	Herstal	100	136	147	108	115	101	96	126	131	111	95	91	90	79
43R222	Liège (ISSeP)	100	138	149	109	114	101	94	121	127	107	96	92	90	81
43R240	Engis	96	129	147	107	112	99	88	124	125	102	92	89	86	77
43R401	Namur	98	119	148	101	108	97	94	117	125	100	90	93	82	82
45R502	Lodelinsart	93	124	150	94	101	98	93	110	126	90	79	82	78	71

Interpolated spatial average in :
Brussels	102	135	142	103	105	98	92	121	119	92	88	86	76	81
Flanders	111	138	126	106	106	97	97	116	115	97	91	91	79	82
Wallonia	98	124	147	103	109	99	92	114	126	100	87	90	83	72
Belgium	104	130	138	104	108	98	94	115	121	99	89	90	81	77

% 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