O3, last 14 days

O₃ concentrations per day (µg/m³), 06/07/2026 - 19/07/2026

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 06/07 07/07 08/07 09/07 10/07 11/07 12/07 13/07 14/07 15/07 16/07 17/07 18/07 19/07

41B011 Sint-Agatha-Berchem 70 107 91 108.5 111.5 129 120.5 113.5 133 120 155 112 97.5 77.5

41MEU1 Neder-Over-Heembeek 67 105 85 106.5 109.5 127 117 113.5 128 119.5 158 105 99 76.5

41N043 Voorhaven (Haren) 48 93.5 75 99 100 120 109.5 104 116 112.5 142.5 98.5 91 72

41R001 Sint-Jans-Molenbeek 64.5 96.5 81.5 101.5 105 124.5 113.5 108.5 122.5 113.5 145.5 104.5 92 73

41R012 Ukkel 67.5 106 92.5 107.5 113.5 140 119.5 115.5 137.5 121.5 158.5 113 98.5 77

42N016 Dessel 97 97.5 78 113.5 110.5 138.5 115 123 130 122 144.5 118 103.5 82

42N027 Bree 99 111 79 102.5 109.5 151.5 129 123 132 130 161 128 110 86

42N035 Aarschot 86 105.5 91 112 114 153 122 130.5 138.5 124.5 145 124 112 87

42N040 Sint-Pieters-Leeuw 68 103 97 108.5 119.5 134 121.5 114 136 120.5 148.5 111.5 98 75

42N046 Gellik 82.5 110.5 90.5 104 132.5 144 124.5 135.5 143.5 137 162.5 126 119 83.5

42N047 Hasselt 85 107 92.5 105 113 147 130 124 137 139 162 121 114 83

42R801 Borgerhout 79 92.5 73.5 106 110.5 116 115.5 114 127.5 124.5 136.5 96.5 100.5 79

42R811 Schoten 81 95 73 107 110 116.5 115 111 129 125 132 102 101.5 79

42R842 Mechelen (Hendrik Speecqvest) 66 97.5 80.5 101.5 107.5 118 111.5 107.5 119.5 118.5 133 97 98 78.5

44M705 Roeselare (Haven) 62 123 97 130.5 132 137.5 139 104 143 124.5 120.5 119.5 107 84

44N012 Moerkerke 66.5 110.5 80.5 117.5 117 110.5 110.5 91 137.5 116.5 138 103 99.5 82

44N029 Houtem (Veurne) 59 107.5 100 114 101.5 110 107.5 97 136.5 125 104.5 120.5 101.5 78

44R701 Gent (Baudelopark) 57.5 105.5 82.5 139.5 126 126 126.5 117 151 127 113 100.5 94 78

44R710 Destelbergen 68 104.5 82.5 136 126.5 129.5 133 117.5 153 60 124.5 102.5 100.5 56

43N060 Havinnes 61.5 108 106 93.5 117.5 73 NA 145.5 155.5 120 135.5 113.5 100 80

43N064 Rixensart 75 111.5 97.5 114.5 120.5 72.5 NA NA NA 128.5 165.5 116.5 106 83

43N066 Eupen NA NA 94 98 119 127.5 108.5 147 143.5 132 143.5 132 115.5 79

43N070 Mons 51 104.5 96.5 125.5 116.5 138 124 120.5 135 124 133.5 98 96 76

43N073 Vezin 70.5 101 110 110.5 137 135.5 119 131 153.5 133.5 137.5 131.5 111.5 87.5

43N085 Vielsalm 68.5 96.5 96 98 118.5 112.5 95 114.5 142 119 125 110.5 116.5 80.5

43N093 Sinsin 69 105 122.5 126.5 121.5 129 107.5 146.5 152 135 144.5 130 119 93

43N100 Dourbes 65.5 105.5 114.5 115.5 139 142.5 122 146 159 148 149 136 119 91.5

43N113 Saint-Ode 67 105 106 102.5 118.5 120.5 97 107.5 135.5 118 128 133 126 86.5

43N121 Offagne 58.5 92.5 101.5 102 125.5 120 96.5 139.5 146.5 126 126.5 130.5 117.5 88

43N132 Habay-La-Neuve 59.5 87.5 104 101.5 113 117 101.5 102.5 121 117 138.5 129 114.5 83

43R221 Herstal 73.5 103.5 99.5 110 133.5 131.5 116 143 148 130.5 150 131.5 118 87.5

43R222 Liège (ISSeP) NA NA 99 118.5 131.5 133 115 143.5 149.5 135 149 135.5 116.5 85

43R240 Engis 65.5 102.5 94 103 129.5 129.5 112.5 136.5 140 128.5 138 131.5 111 81

43R401 Namur 71.5 103 99 104.5 132.5 131 113.5 120 145 131 134 127.5 110 83.5

Interpolated spatial average in :

Brussels 66 101 88 106 109 128 116 112 128 119 147 106 97 77

Flanders 74 103 86 111 114 126 118 113 134 123 131 111 102 81

Wallonia 65 99 101 107 119 125 108 120 139 124 133 119 110 83

Belgium 69 101 94 109 117 126 112 117 137 124 132 115 107 82

% 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	06/07	07/07	08/07	09/07	10/07	11/07	12/07	13/07	14/07	15/07	16/07	17/07	18/07	19/07
41B011	Sint-Agatha-Berchem	70	107	91	108.5	111.5	129	120.5	113.5	133	120	155	112	97.5	77.5
41MEU1	Neder-Over-Heembeek	67	105	85	106.5	109.5	127	117	113.5	128	119.5	158	105	99	76.5
41N043	Voorhaven (Haren)	48	93.5	75	99	100	120	109.5	104	116	112.5	142.5	98.5	91	72
41R001	Sint-Jans-Molenbeek	64.5	96.5	81.5	101.5	105	124.5	113.5	108.5	122.5	113.5	145.5	104.5	92	73
41R012	Ukkel	67.5	106	92.5	107.5	113.5	140	119.5	115.5	137.5	121.5	158.5	113	98.5	77
42N016	Dessel	97	97.5	78	113.5	110.5	138.5	115	123	130	122	144.5	118	103.5	82
42N027	Bree	99	111	79	102.5	109.5	151.5	129	123	132	130	161	128	110	86
42N035	Aarschot	86	105.5	91	112	114	153	122	130.5	138.5	124.5	145	124	112	87
42N040	Sint-Pieters-Leeuw	68	103	97	108.5	119.5	134	121.5	114	136	120.5	148.5	111.5	98	75
42N046	Gellik	82.5	110.5	90.5	104	132.5	144	124.5	135.5	143.5	137	162.5	126	119	83.5
42N047	Hasselt	85	107	92.5	105	113	147	130	124	137	139	162	121	114	83
42R801	Borgerhout	79	92.5	73.5	106	110.5	116	115.5	114	127.5	124.5	136.5	96.5	100.5	79
42R811	Schoten	81	95	73	107	110	116.5	115	111	129	125	132	102	101.5	79
42R842	Mechelen (Hendrik Speecqvest)	66	97.5	80.5	101.5	107.5	118	111.5	107.5	119.5	118.5	133	97	98	78.5
44M705	Roeselare (Haven)	62	123	97	130.5	132	137.5	139	104	143	124.5	120.5	119.5	107	84
44N012	Moerkerke	66.5	110.5	80.5	117.5	117	110.5	110.5	91	137.5	116.5	138	103	99.5	82
44N029	Houtem (Veurne)	59	107.5	100	114	101.5	110	107.5	97	136.5	125	104.5	120.5	101.5	78
44R701	Gent (Baudelopark)	57.5	105.5	82.5	139.5	126	126	126.5	117	151	127	113	100.5	94	78
44R710	Destelbergen	68	104.5	82.5	136	126.5	129.5	133	117.5	153	60	124.5	102.5	100.5	56
43N060	Havinnes	61.5	108	106	93.5	117.5	73	NA	145.5	155.5	120	135.5	113.5	100	80
43N064	Rixensart	75	111.5	97.5	114.5	120.5	72.5	NA	NA	NA	128.5	165.5	116.5	106	83
43N066	Eupen	NA	NA	94	98	119	127.5	108.5	147	143.5	132	143.5	132	115.5	79
43N070	Mons	51	104.5	96.5	125.5	116.5	138	124	120.5	135	124	133.5	98	96	76
43N073	Vezin	70.5	101	110	110.5	137	135.5	119	131	153.5	133.5	137.5	131.5	111.5	87.5
43N085	Vielsalm	68.5	96.5	96	98	118.5	112.5	95	114.5	142	119	125	110.5	116.5	80.5
43N093	Sinsin	69	105	122.5	126.5	121.5	129	107.5	146.5	152	135	144.5	130	119	93
43N100	Dourbes	65.5	105.5	114.5	115.5	139	142.5	122	146	159	148	149	136	119	91.5
43N113	Saint-Ode	67	105	106	102.5	118.5	120.5	97	107.5	135.5	118	128	133	126	86.5
43N121	Offagne	58.5	92.5	101.5	102	125.5	120	96.5	139.5	146.5	126	126.5	130.5	117.5	88
43N132	Habay-La-Neuve	59.5	87.5	104	101.5	113	117	101.5	102.5	121	117	138.5	129	114.5	83
43R221	Herstal	73.5	103.5	99.5	110	133.5	131.5	116	143	148	130.5	150	131.5	118	87.5
43R222	Liège (ISSeP)	NA	NA	99	118.5	131.5	133	115	143.5	149.5	135	149	135.5	116.5	85
43R240	Engis	65.5	102.5	94	103	129.5	129.5	112.5	136.5	140	128.5	138	131.5	111	81
43R401	Namur	71.5	103	99	104.5	132.5	131	113.5	120	145	131	134	127.5	110	83.5

Interpolated spatial average in :
Brussels	66	101	88	106	109	128	116	112	128	119	147	106	97	77
Flanders	74	103	86	111	114	126	118	113	134	123	131	111	102	81
Wallonia	65	99	101	107	119	125	108	120	139	124	133	119	110	83
Belgium	69	101	94	109	117	126	112	117	137	124	132	115	107	82

% 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