info:
The annual mean NO₂ concentrations are published in the table below. The annual mean is the average of all hourly mean concentrations in a calendar year (1/1 till 31/12).
According to EC directive 1999/30/EC the annual limit value of 40 μg/m³ may not be exceeded from 01/01/2010.
The measuring stations are put in decreasing order by the running annual mean^(info) during the present year. The data from the previous years are posted as additional information.

nr	stacode	city	region	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021 (*)
1	42R806	Antwerpen (Maerlant)	Fla																					NA	41
2	42R804	Borgerhout (Ring)	Fla																	NA	54	48	43	34	36
3	41REG1	Brussel (Regentlaan)	Bru																						NA
4	41B001	Brussel (Kunst-Wet)	Bru																	NA	56	56	52	36	36
5	41B008	Brussel (Belliardstraat)	Bru													NA	63	61	62	54	NA	NA	49	36	31
6	42R893	Antwerpen (haven)	Fla	50	48	44	46	46	41	43	42	41	40	38	39	40	36	36	36	35	36	32	30	28	NA
7	42R822	Antwerpen (haven)	Fla	42	44	44	47	44	44	44	44	41	40	40	41	39	39	39	37	38	38	38	35	29	30
8	40AT44	Ordamstraat	Fla																			36	36	33	30
9	41R002	Elsene	Bru	53	NA	54	61	56	58	54	54	54	52	54	50	48	49	47	45	48	49	42(**)	33	27	29
10	42R891	Antwerpen (haven)	Fla	41	45	43	46	43	43	43	40	43	39	40	40	38	37	36	36	36	35	32	32	29	28
11	42R802	Borgerhout (straatkant)	Fla												48	50	49	47	45	45	42	40	36	27	28
12	42R805	Antwerpen (Belgiëlei)	Fla																NA	43	40	40	35	26	27
13	42R892	Kallo (sluis Kallo)	Fla	30	35	34	38	33	35	35	36	40	38	39	37	33	38	34	34	34	32	34	31	27	27
14	42R842	Mechelen (Hendrik Speecqvest)	Fla																					NA	27
15	40R833	Stabroek	Fla													NA	31	30	30	29	30	26	25	23	NA
16	42R897	Antwerpen (haven)	Fla	37	42	40	41	37	40	37	38	39	36	35	36	35	37	35	34	34	32	33	30	25	26
17	42R801	Borgerhout	Fla	48	48	48	50	47	47	46	45	45	45	44	46	45	43	41	38	39	36	34	32	24	25
18	41N043	Voorhaven (Haren)	Bru	47	50	48	47	45	46	45	45	46	47	44	44	43	42	42	42	42	39	37	34	26	25
19	41R001	Sint-Jans-Molenbeek	Bru	38	41	43	49	44	47	47	46	44	43	43	41	41	42	39	35	38	33	35	31	24	25
20	42R818	Antwerpen (Burchtse Weel)	Fla																			NA	31	23	25
21	41B004	Brussel (Sint-Katelijne)	Bru	NA	45	46	47	42	43	NA		41	43	43	40	38	36	34	31	33	35	34	28	23	24
22	42M802	Antwerpen (Luchtbal)	Fla						46	44	44	45	43	44	43	41	40	38	36	35	35	32	30	24	24
23	42R803	Antwerpen (Park Spoor Noord)	Fla																NA	32	31	32	28	22	23
24	41B006	Brussel (EU Parlement)	Bru		NA	36	41	37	38	38	40	38	38	37	33	34	37	32	31	NA		NA	25	19	23
25	44R702	Gent (Gustaaf Callierlaan)	Fla														39	39	38	39	36	34	30	22	23
26	42R830	Doel (Scheldemolenstraat)	Fla	28	30	29	33	30	30	30	27	27	28	28	27	26	27	27	25	26	24	27	24	21	22
27	42R831	Berendrecht	Fla							33	34	34	34	34	32	32	31	31	30	28	28	26	24	20	21
28	44R750	Zelzate	Fla	33	32	32	35	32	32	32	31	31	30	31	30	29	29	27	27	26	26	26	25	21	21
29	45R501	Charleroi	Wal	38	39	38	44	44	42	42	41	37	38	37	36	35	36	32	31	31	28	28	25	20	21
30	42R817	Antwerpen (Groenenborgerlaan)	Fla																NA	32	30	28	26	20	21
31	40HB23	Hoboken	Fla					32	34	34	34	32	32	33	30	29	28	27	27	27	26	26	24	19	NA
32	40AL01	Antwerpen-Linkeroever	Fla														NA	26	26	27	26	26	24	19	21
33	45R503	Charleroi - Parc	Wal																						NA
34	44R701	Gent (Baudelopark)	Fla	38	38	36	41	37	36	36	34	34	34	35	33	31	32	29	28	29	27	26	24	20	20
35	41MEU1	Neder-Over-Heembeek	Bru	36	39	35	40	37	32	31	32	35	34	35	NA	31	32	28	26	27	27	28	28	18	20
36	RMCH19		Fla																						NA
37	42R010	Sint-Stevens-Woluwe	Fla	34	35	34	37	34	34	32	33	31	31	31	30	29	29	27	25	26	25	24	21	17	NA
38	48R235	Bierset	Wal																						19
39	45R502	Lodelinsart	Wal	33	35	34	37	35	33	34	34	31	30	29	28	27	27	25	25	27	25	23	22	17	19
40	41WOL1	Sint-Lambrechts-Woluwe	Bru	43	NA	44	49	42	44	46	46	42	39	40	37	40	40	39	35	33	35	31	27	21	NA
41	43R401	Namur	Wal																				24	17	19
42	43R221	Herstal	Wal														29	26	25	27	25	26	22	18	19
43	42R020	Vilvoorde	Fla	36	37	37	40	36	37	37	35	35	35	34	32	31	30	30	28	28	27	25	23	19	19
44	40SA08	Stabroek	Fla																					NA	19
45	43R223	Jemeppe-sur-Meuse	Wal	NA	38	36	39	37	35	36	34	32	33	32	30	29	28	25	25	26	25	24	22	19	18
46	44R731	Evergem	Fla	29	29	29	32	30	29	30	28	28	28	30	28	27	27	26	25	25	24	24	22	17	18
47	44R740	Sint-Kruiswinkel	Fla	31	32	30	33	31	30	30	30	28	28	29	27	26	26	23	23	24	23	22	21	17	18
48	41F013		Fla																						18
49	44R721	Wondelgem	Fla	29	32	31	35	32	31	32	30	29	29	31	29	26	27	25	23	24	22	23	21	17	18
50	42R811	Schoten	Fla				36	36	35	34	35	33	33	34	31	31	29	28	26	26	27	24	21	17	18
51	43R202	Liège (Av M Destenay)	Wal																						NA
52	40SZ02	Steenokkerzeel	Fla	33	34	30	35	33	31	31	32	29	29	28	30	28	28	24	24	25	26	22	21	16	NA
53	42R834	Boom	Fla													NA	26	23	22	23	23	22	20	15	NA
54	45R512	Marchienne-Au-Pont	Wal	31	33	31	34	31	31	31	30	27	27	27	26	24	24	23	23	23	23	22	22	17	17
55	43N070	Mons	Wal		NA	31	31	30	32	27	33	29	31	31	31	30	29	28	27	27	30	26	23	16	17
56	44M705	Roeselare (Haven)	Fla						26	27	26	26	28	28	27	25	26	24	23	24	23	24	21	17	17
57	40SZ01	Steenokkerzeel	Fla	39	35	32	36	31	32	32	35	33	31	31	30	30	28	25	26	26	26	24	22	17	16
58	42R823	Beveren-Waas	Fla																	23	22	22	20	16	NA
59	43R222	Liège (ISSeP)	Wal						34	33	32	31	29	31	30	28	28	24	24	25	23	25	21	15	16
60	44M702	Ertvelde	Fla	23	25	26	28	26	26	26	25	25	25	27	24	23	24	22	21	21	21	21	19	15	NA
61	48R215	Hermalle	Wal																						15
62	42N047	Hasselt	Fla																				NA	15	15
63	41B011	Sint-Agatha-Berchem	Bru	31	33	31	36	31	32	29	31	28	28	30	28	27	27	23	22	22	23	21	18	12	14
64	44N052	Zwevegem	Fla						26	27	27	25	25	26	26	30	28	25	23	26	20	19	17	13	14
65	40LD02	Geel	Fla				29	26	26	27	25	24	23	25	24	24	23	21	20	21	21	19	18	14	14
66	44R710	Destelbergen	Fla						25	25	28	NA	27	28	26	24	24	22	22	22	21	20	18	14	14
67	43R240	Engis	Wal	29	31	30	32	30	27	29	28	26	24	24	23	22	21	18	18	19	20	20	18	15	14
68	42R820	Kapellen	Fla													NA	23	22	22	21	22	17	18	14	13
69	42N046	Gellik	Fla						23	23	23	21	22	23	21	22	21	18	17	19	18	18	16	13	13
70	42N016	Dessel	Fla	24	26	25	27	25	24	24	23	22	22	23	21	20	20	18	17	18	19	17	16	13	13
71	40SZ05	Steenokkerzeel	Fla																						13
72	43N063	Corroy-Le-Grand	Wal						NA	24	26	24	22	23	20	19	21	17	17	19	17	16	14	11	12
73	41R012	Ukkel	Bru	27	30	26	29	28	27	30	29	27	28	28	26	25	26	21	22	21	20	18	16	10	12
74	42N035	Aarschot	Fla						22	NA	24	22	22	22	21	23	22	19	19	20	19	17	16	12	12
75	42N027	Bree	Fla									NA	21	22	20	19	18	16	15	16	16	16	14	11	11
76	44N012	Moerkerke	Fla	20	22	22	24	20	19	20	18	18	19	19	18	15	16	14	13	15	15	14	14	11	11
77	42N054	Walshoutem	Fla						22	NA	22	20	20	22	20	20	20	18	17	17	16	15	13	10	11
78	42N040	Sint-Pieters-Leeuw	Fla						18	18	NA	18	19	22	20	18	19	16	15	15	15	15	13	9	10
79	43N060	Havinnes	Wal												14	16	16	14	15	14	14	13	12	10	10
80	44N051	Idegem	Fla												13	14	16	13	13	13	13	13	11	9	9
81	44N029	Houtem (Veurne)	Fla	16	18	18	20	17	16	17	17	16	16	16	15	13	14	12	10	11	12	11	10	9	9
82	43N132	Habay-La-Neuve	Wal	15	15	16	15	15	14	15	13	12	12	13	12	10	11	10	9	9	9	9	8	7	8
83	43N073	Vezin	Wal	19	21	20	23	NA	NA	18	18	16	15	16	14	14	15	11	12	12	12	11	9	7	7
84	43N093	Sinsin	Wal						NA	14	14	12	14	16	12	12	12	10	10	10	9	9	7	7	7
85	43N066	Eupen	Wal	14	19	16	19	14	16	16	17	13	14	16	12	12	13	10	11	10	10	10	8	6	7
86	43N085	Vielsalm	Wal		NA	8	8	10	10	11	8	7	7	8	8	6	7	6	6	6	6	7	5	5	5
87	43N121	Offagne	Wal	12	14	15	16	14	13	NA	9	8	9	11	9	8	8	7	7	7	6	7	5	5	5
88	43N100	Dourbes	Wal	10	11	11	13	13	12	12	10	8	8	9	7	7	8	6	7	7	5	6	5	4	5
89	43N113	Saint-Ode	Wal									NA	9	10	8	7	8	7	7	8	7	7	4	4	5
90	43R201	Liège	Wal	36	35	NA	39	35	34	35	35	31	29	30	28	27	NA
91	42R894	Antwerpen (haven)	Fla	46	48	46	48	43	44	42	39	41	38	39	39	41	40	42	40	40	41
92	40ML01	Mechelen (Hombeeksestwg)	Fla	36	38	39	39	36	36	36	36	34	33	34	31	29
93	40LD01	Laakdal	Fla	NA	31	29	32	30	29	29	30	27	26	28	27	24	24	21	21	21	19	17	NA
94	42R815	Zwijndrecht	Fla						36	NA	37	34	34	36	35	33	33	32	29	29	28
95	40OB01	Oostrozebeke	Fla	33	36	32	33	29	30	31	31	30	27	28	28	25	24
96	40SA04	Hoevenen	Fla														NA	27	27	27	NA
97	40WZ01	Lommel	Fla	24	25	25
98	42N015	Schilde	Fla	29	29	28	31	30	30	30	30	NA
99	42N045	Hasselt	Fla						30	30	29	30	27	29	27	26	25	23	23	24
100	40HR01		Fla	20	21	20	NA
101	40GK09	Genk (Sluis Langerlo)	Fla									26	27	28	25	24	24	22	20	22	NA
102	41B005	Brussel (Belliard)	Bru		NA	41	42	41	40	39	43	37	39	41	39	36
103	41B003	Brussel (Kunst-Wet)	Bru	69	73	NA	86	87	93	98	97	101
104	44N050	Sint-Denijs	Fla	22	25	24	26	NA
105	42R841	Mechelen (Technologielaan)	Fla				NA	33	33	NA	34	33	32	35	32	33	33	30	27	27
106	42R832	Ruisbroek	Fla	33	36	34	40	36	37	37	36	34	34	34	32
107	42R821	Beveren Waas	Fla	30	32	31	35	31	31	30	30	29	29	30	28	25	27	24	NA
108	40EG05	Evergem (Rieme)	Fla																					NA
109	41AND3	Anderlecht	Bru		42			NA

(info) : Running average : average of the daily mean concentrations from 23/09/2020 till 23/09/2021. This period shifts daily with one day. A compliancy check with the EU limit value will only be possible on 31/12.

"NA" means that there were less then 75% available days with sufficient measuring data to calculate the annual mean PM10 concentration..

(*) Calculated with not validated data

(**) Between 1 August and 21 November 2018, a technical problem occurred at the Ixelles monitoring station (41R002) resulting in an underestimation of nitrogen dioxide concentrations. Data measured during this period have been invalidated. As a result, the minimum data acquisition rate required by Directive 2008/50/EC (90%) is not respected at this station and the annual average of 42 μg/m³ is not representative. However, this station would probably exceed the European annual limit value of 40 μg/m³ if the 90% data acquisition rate was respected.
More info (report in FR): ici