O3, last 14 days

O₃ concentrations per day (µg/m³), 03/08/2026 - 16/08/2026

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

Code city 03/08[O₃]
04/08 05/08 06/08 07/08 08/08 09/08 10/08 11/08 12/08 13/08[O₃]
14/08[O₃]
15/08[O₃]
16/08

41B011 Sint-Agatha-Berchem 167.5 119.5 88 92.5 109 141 136.5 124.5 108 144 147.5 174 152 92

41MEU1 Neder-Over-Heembeek 181 115.5 83.5 92.5 108 141.5 133 124 103 138.5 138 168 136.5 92.5

41N043 Voorhaven (Haren) 173.5 104.5 80.5 84.5 100 133 123.5 110.5 96.5 132 133 153.5 124.5 82

41R001 Sint-Jans-Molenbeek 169.5 111 81 85 98 133.5 129 103.5 96.5 137.5 130.5 156.5 135 87

41R012 Ukkel 176 113 85 93.5 106.5 131 133 124 111.5 144.5 144.5 172 146 94

42N016 Dessel 169 125 90 95.5 94.5 131.5 143 128.5 96.5 154 155 206 125 95.5

42N027 Bree 163 131 94 108 97 144 154 138 97.5 160 156 214.5 138 92.5

42N035 Aarschot 184 134 94 101.5 106 145 150.5 137 109 152 161 199.5 151 93.5

42N040 Sint-Pieters-Leeuw 165.5 104 49 93.5 107.5 130.5 132 123.5 112 143.5 145.5 174.5 156.5 95

42N046 Gellik 168.5 116.5 91.5 109 98.5 142.5 146 152.5 117.5 139.5 152.5 210 154.5 92.5

42N047 Hasselt 156 119.5 92 103.5 99.5 135.5 144 136.5 114.5 151 157.5 207 149 88

42R801 Borgerhout 184.5 133.5 89.5 94.5 100.5 134 139.5 126 97 141.5 168 187 123.5 92

42R811 Schoten 192 132.5 91.5 92.5 96.5 133 143.5 130.5 97.5 150 169.5 203 120 86

42R842 Mechelen (Hendrik Speecqvest) 186 111.5 79 90.5 97.5 130 127 114 93.5 141.5 130 169 122 82

44M705 Roeselare (Haven) 164.5 145 94 103 116.5 129.5 149.5 117.5 102 146 169.5 199.5 132.5 96

44N012 Moerkerke 134 142.5 93 91 112 150.5 143.5 122 102 157 182 210.5 99.5 90.5

44N029 Houtem (Veurne) 134.5 143 87 94.5 116 148.5 148.5 122.5 115.5 158.5 179.5 207 97.5 92.5

44R701 Gent (Baudelopark) 168 132.5 90.5 95 118 143.5 147 125.5 103.5 147 155.5 192 143.5 85.5

44R710 Destelbergen 179 140 95.5 99.5 122.5 148 156 131 109 155 158.5 203 149 90

43N060 Havinnes 161 123 81.5 90 110.5 128 117.5 122 110.5 131 141.5 186.5 163 94

43N064 Rixensart 168.5 120 91 102.5 115 130 140.5 121.5 121 148 149 174 167.5 100.5

43N066 Eupen 135 113 91.5 101 104.5 131 127 146.5 108 119.5 129 188.5 170 102.5

43N070 Mons 149.5 74.5 63.5 88 105 126 92 115 105 133.5 154 166 191.5 88

43N073 Vezin 138 107 85 103 105 129 131 130.5 104.5 130.5 163 173 174 101.5

43N085 Vielsalm 133 97 83 97 98 120 118 131 100.5 104 131 166.5 157 125.5

43N093 Sinsin 144.5 107.5 85 104 106 125 139 133 113.5 120.5 133.5 166 167.5 122

43N100 Dourbes 159.5 116.5 91.5 102.5 117 130 132.5 142 126 137 149.5 176 184 137

43N113 Saint-Ode 147.5 112 93.5 96 112 130 137 136 99 104.5 136 165.5 158 133

43N121 Offagne 153 107.5 92.5 92.5 110 130.5 136 136.5 104 105.5 147 154 158 130

43N132 Habay-La-Neuve 147.5 113 84 89.5 103.5 137.5 135.5 125.5 103.5 106.5 157 153.5 153 136.5

43R221 Herstal 143.5 103 86.5 102.5 100 134.5 143 135.5 104 127 147 190.5 177 98.5

43R222 Liège (ISSeP) 140 102 87.5 104.5 106 135.5 138.5 131.5 110.5 129 148.5 174.5 184 105.5

43R240 Engis 135 91.5 83 97 100 124 125.5 121 103 125 149.5 174 176.5 92.5

43R401 Namur 134 103 89 104.5 99.5 125 132 129.5 100 123 151.5 158.5 173.5 107

45R502 Lodelinsart 154.5 104 79.5 95.5 114 130.5 124.5 127.5 106.5 136 142.5 165 185.5 103

Interpolated spatial average in :

Brussels 166 113 84 91 105 133 130 120 105 140 138 166 142 90

Flanders 158 126 90 97 106 136 141 121 104 145 155 188 128 89

Wallonia 144 107 83 96 105 127 125 123 105 119 141 163 162 111

Belgium 150 116 86 96 105 131 132 122 105 130 147 174 147 101

% 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 7% 0% 0% 0% 0% 0% 0% 0% 0% 0% 2% 69% <1% 0%

Wallonia <1% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 4% 4% 0%

Belgium 4% 0% 0% 0% 0% 0% 0% 0% 0% 0% <1% 41% 1% 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	03/08[O₃]	04/08	05/08	06/08	07/08	08/08	09/08	10/08	11/08	12/08	13/08[O₃]	14/08[O₃]	15/08[O₃]	16/08
41B011	Sint-Agatha-Berchem	167.5	119.5	88	92.5	109	141	136.5	124.5	108	144	147.5	174	152	92
41MEU1	Neder-Over-Heembeek	181	115.5	83.5	92.5	108	141.5	133	124	103	138.5	138	168	136.5	92.5
41N043	Voorhaven (Haren)	173.5	104.5	80.5	84.5	100	133	123.5	110.5	96.5	132	133	153.5	124.5	82
41R001	Sint-Jans-Molenbeek	169.5	111	81	85	98	133.5	129	103.5	96.5	137.5	130.5	156.5	135	87
41R012	Ukkel	176	113	85	93.5	106.5	131	133	124	111.5	144.5	144.5	172	146	94
42N016	Dessel	169	125	90	95.5	94.5	131.5	143	128.5	96.5	154	155	206	125	95.5
42N027	Bree	163	131	94	108	97	144	154	138	97.5	160	156	214.5	138	92.5
42N035	Aarschot	184	134	94	101.5	106	145	150.5	137	109	152	161	199.5	151	93.5
42N040	Sint-Pieters-Leeuw	165.5	104	49	93.5	107.5	130.5	132	123.5	112	143.5	145.5	174.5	156.5	95
42N046	Gellik	168.5	116.5	91.5	109	98.5	142.5	146	152.5	117.5	139.5	152.5	210	154.5	92.5
42N047	Hasselt	156	119.5	92	103.5	99.5	135.5	144	136.5	114.5	151	157.5	207	149	88
42R801	Borgerhout	184.5	133.5	89.5	94.5	100.5	134	139.5	126	97	141.5	168	187	123.5	92
42R811	Schoten	192	132.5	91.5	92.5	96.5	133	143.5	130.5	97.5	150	169.5	203	120	86
42R842	Mechelen (Hendrik Speecqvest)	186	111.5	79	90.5	97.5	130	127	114	93.5	141.5	130	169	122	82
44M705	Roeselare (Haven)	164.5	145	94	103	116.5	129.5	149.5	117.5	102	146	169.5	199.5	132.5	96
44N012	Moerkerke	134	142.5	93	91	112	150.5	143.5	122	102	157	182	210.5	99.5	90.5
44N029	Houtem (Veurne)	134.5	143	87	94.5	116	148.5	148.5	122.5	115.5	158.5	179.5	207	97.5	92.5
44R701	Gent (Baudelopark)	168	132.5	90.5	95	118	143.5	147	125.5	103.5	147	155.5	192	143.5	85.5
44R710	Destelbergen	179	140	95.5	99.5	122.5	148	156	131	109	155	158.5	203	149	90
43N060	Havinnes	161	123	81.5	90	110.5	128	117.5	122	110.5	131	141.5	186.5	163	94
43N064	Rixensart	168.5	120	91	102.5	115	130	140.5	121.5	121	148	149	174	167.5	100.5
43N066	Eupen	135	113	91.5	101	104.5	131	127	146.5	108	119.5	129	188.5	170	102.5
43N070	Mons	149.5	74.5	63.5	88	105	126	92	115	105	133.5	154	166	191.5	88
43N073	Vezin	138	107	85	103	105	129	131	130.5	104.5	130.5	163	173	174	101.5
43N085	Vielsalm	133	97	83	97	98	120	118	131	100.5	104	131	166.5	157	125.5
43N093	Sinsin	144.5	107.5	85	104	106	125	139	133	113.5	120.5	133.5	166	167.5	122
43N100	Dourbes	159.5	116.5	91.5	102.5	117	130	132.5	142	126	137	149.5	176	184	137
43N113	Saint-Ode	147.5	112	93.5	96	112	130	137	136	99	104.5	136	165.5	158	133
43N121	Offagne	153	107.5	92.5	92.5	110	130.5	136	136.5	104	105.5	147	154	158	130
43N132	Habay-La-Neuve	147.5	113	84	89.5	103.5	137.5	135.5	125.5	103.5	106.5	157	153.5	153	136.5
43R221	Herstal	143.5	103	86.5	102.5	100	134.5	143	135.5	104	127	147	190.5	177	98.5
43R222	Liège (ISSeP)	140	102	87.5	104.5	106	135.5	138.5	131.5	110.5	129	148.5	174.5	184	105.5
43R240	Engis	135	91.5	83	97	100	124	125.5	121	103	125	149.5	174	176.5	92.5
43R401	Namur	134	103	89	104.5	99.5	125	132	129.5	100	123	151.5	158.5	173.5	107
45R502	Lodelinsart	154.5	104	79.5	95.5	114	130.5	124.5	127.5	106.5	136	142.5	165	185.5	103

Interpolated spatial average in :
Brussels	166	113	84	91	105	133	130	120	105	140	138	166	142	90
Flanders	158	126	90	97	106	136	141	121	104	145	155	188	128	89
Wallonia	144	107	83	96	105	127	125	123	105	119	141	163	162	111
Belgium	150	116	86	96	105	131	132	122	105	130	147	174	147	101

% 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	7%	0%	0%	0%	0%	0%	0%	0%	0%	0%	2%	69%	<1%	0%
Wallonia	<1%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	4%	4%	0%
Belgium	4%	0%	0%	0%	0%	0%	0%	0%	0%	0%	<1%	41%	1%	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