Number of days with highest 8h-mean concentration > 120 µg/m³ (EU target value)Number of days with highest hourly concentration > 180 µg/m³ (EU information threshold)Number of days with highest hourly concentration > 240 µg/m³ (EU alert threshold)

Change start year:

The number of days with daily highest 8-hour mean ozone concentrations higher than 120 µg/m³ are published in the table below.

According to EC directive 2008/50/EC the target value for the protection of human health, is the daily highest 8-hour mean ozone concentration of 120 µg/m³ that cannot be exceeded more then 25 times, averaged over three calender years. The averages over three years are published in the yellow table cells. The orange table cells indicate an exceedance. The row below the averages over three years give the number of days with highest 8-hour mean concentration above 120 µg/m³ per calender year. The long-term objective for the protection of human health, is no more exceedances of the daily highest 8-hour mean of 120 µg/m³.

This table will be updated every day at around 07:00 AM.

Code City Region 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024* 2025*
41B004 Brussel (Sint-Katelijne) Bru 8 8 6 7 5 5 7 8 12 8 8 5 7
11 8 6 9 2 9 3 3 16 6 15 3 7
41B006 Brussel (EU Parlement) Bru 9 6 6 8 11 11
13 7 6 5 NA 11 NA
41B011 Sint-Agatha-Berchem Bru 12 11 10 11 9 11 17 21 24 15 15 14 14
16 11 8 14 7 12 9 11 32 21 19 6 21 16 5 14
41MEU1 Neder-Over-Heembeek Bru 27 27 23 13 15 13 13
27 NA 19 6 19 15 6 12
41N043 Voorhaven (Haren) Bru 5 5 3 4 3 4 7 10 14 8 9 8 9
4 5 6 3 0 8 1 3 18 9 14 1 11 11 6 8
41R001 Sint-Jans-Molenbeek Bru 7 4 2 2 1 3 7 11 14 10 8 7 8
10 6 5 2 0 4 0 4 17 13 13 3 NA 11 5 7
41R012 Ukkel Bru 13 11 9 11 9 9 14 17 20 15 18 17 16
17 13 9 12 7 14 5 9 27 14 19 12 24 15 9 15
41WOL1 Sint-Lambrechts-Woluwe Bru 7 4 3 1 1 3 4 6 6 9
9 5 6 2 0 NA 0 2 6 3 9
42N016 Dessel Fla 14 13 12 16 17 17 27 28 31 18 19 18 21
17 16 9 14 14 19 18 15 47 21 26 8 23 23 16 11
42N027 Bree Fla 17 13 11 15 17 20 27 28 29 17 18 17 18
21 20 10 10 12 22 18 21 41 22 24 6 24 20 11 20
42N035 Aarschot Fla 15 14 11 14 14 18 25 27 30 18 18 17 20
18 16 11 14 8 20 14 19 42 21 27 6 22 22 15 16
42N040 Sint-Pieters-Leeuw Fla 12 11 8 9 9 14 22 23 24 14 15 14 15
15 13 8 12 4 12 12 17 36 15 20 6 20 17 7 10
42N045 Hasselt Fla 14 14 12 15 17 19 19
17 18 8 15 12 19 19
42N046 Gellik Fla 13 10 8 13 15 17 23 25 27 16 16 15 18
19 13 7 9 9 20 15 15 39 21 22 4 23 19 13 16
42N047 Hasselt Fla 25 15 17 16 20
NA 25 4 22 22 15 21
42N054 Walshoutem Fla 12 11 10 12 10 13 20 23 26 14 14 11 11
16 12 7 14 8 14 9 17 35 18 24 0 19 14 0
42R801 Borgerhout Fla 8 6 4 3 2 2 5 7 10 3 6 9 11
11 6 7 4 1 4 0 3 13 6 NA 0 11 17 5 11
42R811 Schoten Fla 14 12 9 11 13 15 22 23 24 14 13 14 15
15 18 8 10 8 15 15 15 35 19 18 5 17 20 7 15
42R831 Berendrecht Fla 8 6 6 8 9 11 15 18 20 15 15 14 11
8 NA 7 5 5 13 8 12 25 16 20 8 16 18 0
42R841 Mechelen (Technologielaan) Fla 9 8 8 8 9 9 9
11 NA 7 8 NA NA 9
44M705 Roeselare (Haven) Fla 6 4 3 3 4 7 12 14 15 9 9 9 12
8 3 6 3 1 6 6 10 20 13 13 0 14 14 9 7
44N012 Moerkerke Fla 5 4 4 5 9 9 12 13 13 10 11 12 12
5 4 NA 4 NA 6 11 10 15 13 12 6 14 16 7 7
44N029 Houtem (Veurne) Fla 5 5 3 3 4 5 8 9 11 8 8 8 8
4 7 5 3 1 5 5 4 14 9 11 4 9 11 3 6
44N051 Idegem Fla 12 11 7 9 7 10 20 22 24 17 21 18 18
15 16 6 12 4 10 7 14 39 12 22 NA 19 16
44N052 Zwevegem Fla 7 5 4 4 3 7 13 17 19 12 11 5
10 4 8 3 2 6 2 12 25 14 17 5
44R701 Gent (Baudelopark) Fla 11 8 5 5 6 9 14 17 20 14 12 11 13
12 13 8 4 3 8 8 11 22 18 19 4 NA 17 9 12
44R710 Destelbergen Fla 11 9 7 8 7 9 13 18 19 13 13 13 15
12 11 9 8 3 12 5 11 24 19 15 5 18 16 10 11
44R740 Sint-Kruiswinkel Fla 8 9 6 8 7 10 14 16 17 11 13 12 11
5 11 8 8 3 12 7 12 22 14 15 5 18 14 0
43N060 Havinnes Wal 6 6 5 5 5 6 11 12 16 9 8 9 10
7 5 7 2 7 5 5 22 10 15 2 7 18 4 8
43N063 Corroy-Le-Grand Wal 10 9 7 9 6 9 16 20 24 14 14 3
15 8 7 12 3 12 4 10 34 15 24 3
43N066 Eupen Wal 14 13 10 11 9 10 21 23 29 10 12 14 15
18 17 6 15 8 11 8 12 42 15 NA 4 20 18 8 9
43N070 Mons Wal 6 7 6 6 3 5 12 15 21 13 15 10 11
6 6 7 9 1 7 2 7 27 12 25 3 16 11 5 11
43N073 Vezin Wal 11 11 10 15 13 14 21 25 27 16 15 14 15
13 13 7 13 NA 16 10 16 38 21 21 5 19 17 10 15
43N085 Vielsalm Wal 13 15 11 13 10 10 16 17 20 10 10 9 9
13 18 9 19 6 15 9 7 31 13 16 2 12 13 2 9
43N093 Sinsin Wal 16 13 9 11 8 10 15 22 26 17 14 12 12
23 15 9 15 2 16 5 9 31 25 22 3 17 16 4 11
43N100 Dourbes Wal 18 18 13 16 12 14 20 24 31 21 20 15 14
22 20 12 23 4 20 11 12 37 23 32 9 18 17 6 7
43N113 Saint-Ode Wal 16 15 9 12 9 11 21 19 22 13 13 12 12
21 22 6 17 4 14 NA 8 33 17 17 4 18 14 3 10
43N121 Offagne Wal 14 12 7 12 10 12 16 17 22 13 14 11 10
22 14 6 15 1 20 10 6 33 13 21 5 17 11 2 6
43N132 Habay-La-Neuve Wal 17 14 11 14 12 13 18 21 25 15 13 11 10
23 16 11 16 7 19 11 8 36 18 20 8 12 14 4 7
43R201 Liège Wal 11 9 4
15 13 4 NA
43R221 Herstal Wal 13 9 9 6 9 17 22 23 12 11 12 13
13 4 11 3 13 36 18 15 3 14 18 8 14
43R222 Liège (ISSeP) Wal 11 9 7 9 7 10 18 22 24 13 12 12 13
17 9 6 12 4 12 5 12 37 16 19 3 15 17 8 15
43R240 Engis Wal 13 13 10 13 11 15 25 21 23 12 14 13 14
16 15 8 17 6 16 NA 14 35 15 19 3 20 16 6 9
43R401 Namur Wal 9 7
NA NA NA NA 9 5 9
45R502 Lodelinsart Wal 8 8 4 7 5 7 16 19 22 11 11 8 9
10 12 3 8 2 10 4 8 35 14 18 2 14 9 4 8

Code	City	Region	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023	2024*
41B004	Brussel (Sint-Katelijne)	Bru			8	8	6	7	5	5	7	8	12	8	8	5	7
	11	8	6	9	2	9	3	3	16	6	15	3	7
41B006	Brussel (EU Parlement)	Bru			9	6	6	8	11	11
	13	7	6	5	NA	11	NA
41B011	Sint-Agatha-Berchem	Bru			12	11	10	11	9	11	17	21	24	15	15	14	14
	16	11	8	14	7	12	9	11	32	21	19	6	21	16	5	14
41MEU1	Neder-Over-Heembeek	Bru									27	27	23	13	15	13	13
									27	NA	19	6	19	15	6	12
41N043	Voorhaven (Haren)	Bru			5	5	3	4	3	4	7	10	14	8	9	8	9
	4	5	6	3	0	8	1	3	18	9	14	1	11	11	6	8
41R001	Sint-Jans-Molenbeek	Bru			7	4	2	2	1	3	7	11	14	10	8	7	8
	10	6	5	2	0	4	0	4	17	13	13	3	NA	11	5	7
41R012	Ukkel	Bru			13	11	9	11	9	9	14	17	20	15	18	17	16
	17	13	9	12	7	14	5	9	27	14	19	12	24	15	9	15
41WOL1	Sint-Lambrechts-Woluwe	Bru			7	4	3	1		1	3	4	6	6	9
	9	5	6	2	0	NA	0	2	6	3	9
42N016	Dessel	Fla			14	13	12	16	17	17	27	28	31	18	19	18	21
	17	16	9	14	14	19	18	15	47	21	26	8	23	23	16	11
42N027	Bree	Fla			17	13	11	15	17	20	27	28	29	17	18	17	18
	21	20	10	10	12	22	18	21	41	22	24	6	24	20	11	20
42N035	Aarschot	Fla			15	14	11	14	14	18	25	27	30	18	18	17	20
	18	16	11	14	8	20	14	19	42	21	27	6	22	22	15	16
42N040	Sint-Pieters-Leeuw	Fla			12	11	8	9	9	14	22	23	24	14	15	14	15
	15	13	8	12	4	12	12	17	36	15	20	6	20	17	7	10
42N045	Hasselt	Fla			14	14	12	15	17	19	19
	17	18	8	15	12	19	19
42N046	Gellik	Fla			13	10	8	13	15	17	23	25	27	16	16	15	18
	19	13	7	9	9	20	15	15	39	21	22	4	23	19	13	16
42N047	Hasselt	Fla											25	15	17	16	20
										NA	25	4	22	22	15	21
42N054	Walshoutem	Fla			12	11	10	12	10	13	20	23	26	14	14	11	11
	16	12	7	14	8	14	9	17	35	18	24	0	19	14	0
42R801	Borgerhout	Fla			8	6	4	3	2	2	5	7	10	3	6	9	11
	11	6	7	4	1	4	0	3	13	6	NA	0	11	17	5	11
42R811	Schoten	Fla			14	12	9	11	13	15	22	23	24	14	13	14	15
	15	18	8	10	8	15	15	15	35	19	18	5	17	20	7	15
42R831	Berendrecht	Fla			8	6	6	8	9	11	15	18	20	15	15	14	11
	8	NA	7	5	5	13	8	12	25	16	20	8	16	18	0
42R841	Mechelen (Technologielaan)	Fla			9	8	8	8	9	9	9
	11	NA	7	8	NA	NA	9
44M705	Roeselare (Haven)	Fla			6	4	3	3	4	7	12	14	15	9	9	9	12
	8	3	6	3	1	6	6	10	20	13	13	0	14	14	9	7
44N012	Moerkerke	Fla			5	4	4	5	9	9	12	13	13	10	11	12	12
	5	4	NA	4	NA	6	11	10	15	13	12	6	14	16	7	7
44N029	Houtem (Veurne)	Fla			5	5	3	3	4	5	8	9	11	8	8	8	8
	4	7	5	3	1	5	5	4	14	9	11	4	9	11	3	6
44N051	Idegem	Fla			12	11	7	9	7	10	20	22	24	17	21	18	18
	15	16	6	12	4	10	7	14	39	12	22	NA	19	16
44N052	Zwevegem	Fla			7	5	4	4	3	7	13	17	19	12	11	5
	10	4	8	3	2	6	2	12	25	14	17	5
44R701	Gent (Baudelopark)	Fla			11	8	5	5	6	9	14	17	20	14	12	11	13
	12	13	8	4	3	8	8	11	22	18	19	4	NA	17	9	12
44R710	Destelbergen	Fla			11	9	7	8	7	9	13	18	19	13	13	13	15
	12	11	9	8	3	12	5	11	24	19	15	5	18	16	10	11
44R740	Sint-Kruiswinkel	Fla			8	9	6	8	7	10	14	16	17	11	13	12	11
	5	11	8	8	3	12	7	12	22	14	15	5	18	14	0
43N060	Havinnes	Wal			6	6	5	5	5	6	11	12	16	9	8	9	10
		7	5	7	2	7	5	5	22	10	15	2	7	18	4	8
43N063	Corroy-Le-Grand	Wal			10	9	7	9	6	9	16	20	24	14	14	3
	15	8	7	12	3	12	4	10	34	15	24	3
43N066	Eupen	Wal			14	13	10	11	9	10	21	23	29	10	12	14	15
	18	17	6	15	8	11	8	12	42	15	NA	4	20	18	8	9
43N070	Mons	Wal			6	7	6	6	3	5	12	15	21	13	15	10	11
	6	6	7	9	1	7	2	7	27	12	25	3	16	11	5	11
43N073	Vezin	Wal			11	11	10	15	13	14	21	25	27	16	15	14	15
	13	13	7	13	NA	16	10	16	38	21	21	5	19	17	10	15
43N085	Vielsalm	Wal			13	15	11	13	10	10	16	17	20	10	10	9	9
	13	18	9	19	6	15	9	7	31	13	16	2	12	13	2	9
43N093	Sinsin	Wal			16	13	9	11	8	10	15	22	26	17	14	12	12
	23	15	9	15	2	16	5	9	31	25	22	3	17	16	4	11
43N100	Dourbes	Wal			18	18	13	16	12	14	20	24	31	21	20	15	14
	22	20	12	23	4	20	11	12	37	23	32	9	18	17	6	7
43N113	Saint-Ode	Wal			16	15	9	12	9	11	21	19	22	13	13	12	12
	21	22	6	17	4	14	NA	8	33	17	17	4	18	14	3	10
43N121	Offagne	Wal			14	12	7	12	10	12	16	17	22	13	14	11	10
	22	14	6	15	1	20	10	6	33	13	21	5	17	11	2	6
43N132	Habay-La-Neuve	Wal			17	14	11	14	12	13	18	21	25	15	13	11	10
	23	16	11	16	7	19	11	8	36	18	20	8	12	14	4	7
43R201	Liège	Wal			11	9	4
	15	13	4	NA
43R221	Herstal	Wal				13	9	9	6	9	17	22	23	12	11	12	13
				13	4	11	3	13	36	18	15	3	14	18	8	14
43R222	Liège (ISSeP)	Wal			11	9	7	9	7	10	18	22	24	13	12	12	13
	17	9	6	12	4	12	5	12	37	16	19	3	15	17	8	15
43R240	Engis	Wal			13	13	10	13	11	15	25	21	23	12	14	13	14
	16	15	8	17	6	16	NA	14	35	15	19	3	20	16	6	9
43R401	Namur	Wal														9	7
										NA	NA	NA	NA	9	5	9
45R502	Lodelinsart	Wal			8	8	4	7	5	7	16	19	22	11	11	8	9
	10	12	3	8	2	10	4	8	35	14	18	2	14	9	4	8

* Not validated data.
"NA" means that there were less then 75% available days in the summer season (april-september) with sufficient measuring data to calculate the daily highest 8-hour mean ozone concentration.