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*
41B004	Brussel (Sint-Katelijne)	Bru			8	8	6	7	5	5	7	8	12	8	8	5
			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
			16	11	8	14	7	12	9	11	32	21	19	6	21	16	5
41MEU1	Neder-Over-Heembeek	Bru									27	27	23	13	15	13
											27	NA	19	6	19	15	6
41N043	Voorhaven (Haren)	Bru			5	5	3	4	3	4	7	10	14	8	9	8
			4	5	6	3	0	8	1	3	18	9	14	1	11	11	6
41R001	Sint-Jans-Molenbeek	Bru			7	4	2	2	1	3	7	11	14	10	8	7
			10	6	5	2	0	4	0	4	17	13	13	3	NA	11	5
41R012	Ukkel	Bru			13	11	9	11	9	9	14	17	20	15	18	17
			17	13	9	12	7	14	5	9	27	14	19	12	24	15	9
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
			17	16	9	14	14	19	18	15	47	21	26	8	23	23	16
42N027	Bree	Fla			17	13	11	15	17	20	27	28	29	17	18	17
			21	20	10	10	12	22	18	21	41	22	24	6	24	20	11
42N035	Aarschot	Fla			15	14	11	14	14	18	25	27	30	18	18	17
			18	16	11	14	8	20	14	19	42	21	27	6	22	22	15
42N040	Sint-Pieters-Leeuw	Fla			12	11	8	9	9	14	22	23	24	14	15	14
			15	13	8	12	4	12	12	17	36	15	20	6	20	17	7
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
			19	13	7	9	9	20	15	15	39	21	22	4	23	19	13
42N047	Hasselt	Fla											25	15	17	16
												NA	25	4	22	22	15
42N054	Walshoutem	Fla			12	11	10	12	10	13	20	23	26	14	14	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	6	7	4	1	4	0	3	13	6	NA	0	11	17	5
42R811	Schoten	Fla			14	12	9	11	13	15	22	23	24	14	13	14
			15	18	8	10	8	15	15	15	35	19	18	5	17	20	7
42R831	Berendrecht	Fla			8	6	6	8	9	11	15	18	20	15	15	14
			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
			8	3	6	3	1	6	6	10	20	13	13	0	14	14	9
44N012	Moerkerke	Fla			5	4	4	5	9	9	12	13	13	10	11	12
			5	4	NA	4	NA	6	11	10	15	13	12	6	14	16	7
44N029	Houtem (Veurne)	Fla			5	5	3	3	4	5	8	9	11	8	8	8
			4	7	5	3	1	5	5	4	14	9	11	4	9	11	3
44N051	Idegem	Fla			12	11	7	9	7	10	20	22	24	17	21	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
			12	13	8	4	3	8	8	11	22	18	19	4	NA	17	9
44R710	Destelbergen	Fla			11	9	7	8	7	9	13	18	19	13	13	13
			12	11	9	8	3	12	5	11	24	19	15	5	18	16	10
44R740	Sint-Kruiswinkel	Fla			8	9	6	8	7	10	14	16	17	11	13	12
			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
				7	5	7	2	7	5	5	22	10	15	2	7	18	4
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
			18	17	6	15	8	11	8	12	42	15	NA	4	20	18	8
43N070	Mons	Wal			6	7	6	6	3	5	12	15	21	13	15	10
			6	6	7	9	1	7	2	7	27	12	25	3	16	11	5
43N073	Vezin	Wal			11	11	10	15	13	14	21	25	27	16	15	14
			13	13	7	13	NA	16	10	16	38	21	21	5	19	17	10
43N085	Vielsalm	Wal			13	15	11	13	10	10	16	17	20	10	10	9
			13	18	9	19	6	15	9	7	31	13	16	2	12	13	2
43N093	Sinsin	Wal			16	13	9	11	8	10	15	22	26	17	14	12
			23	15	9	15	2	16	5	9	31	25	22	3	17	16	4
43N100	Dourbes	Wal			18	18	13	16	12	14	20	24	31	21	20	15
			22	20	12	23	4	20	11	12	37	23	32	9	18	17	6
43N113	Saint-Ode	Wal			16	15	9	12	9	11	21	19	22	13	13	12
			21	22	6	17	4	14	NA	8	33	17	17	4	18	14	3
43N121	Offagne	Wal			14	12	7	12	10	12	16	17	22	13	14	11
			22	14	6	15	1	20	10	6	33	13	21	5	17	11	2
43N132	Habay-La-Neuve	Wal			17	14	11	14	12	13	18	21	25	15	13	11
			23	16	11	16	7	19	11	8	36	18	20	8	12	14	4
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	4	11	3	13	36	18	15	3	14	18	8
43R222	Liège (ISSeP)	Wal			11	9	7	9	7	10	18	22	24	13	12	12
			17	9	6	12	4	12	5	12	37	16	19	3	15	17	8
43R240	Engis	Wal			13	13	10	13	11	15	25	21	23	12	14	13
			16	15	8	17	6	16	NA	14	35	15	19	3	20	16	6
43R401	Namur	Wal														9
												NA	NA	NA	NA	9	5
45R502	Lodelinsart	Wal			8	8	4	7	5	7	16	19	22	11	11	8
			10	12	3	8	2	10	4	8	35	14	18	2	14	9	4

* 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.