SmogRank / Episodes / Belgium

Western Europe, January 2025

For 3 days, from 10 to 12 January 2025, 50 cities in Belgium, Germany, the United Kingdom and 3 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Le Havre, Normandy, France: 52.8 µg/m³ on 12 January, about 5.8× its usual 9.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached50in 6 countries
Days310 to 12 January 2025
Worst day11 January37 cities counted
Furthest above usual6.2×Dagenham

Day by day

11 January 37 cities at twice their usual or more
DieppeCalaisRouenCaenLouviersDunkirkCherbourgÉvreuxKoksijdeAmiensDreuxSaint HelierCreilDomontParisTournaiMaldegemSaint-QuentinCoulommiers's-GravenzandeMaassluisSpijkenisseThe HagueSchiedamReimsCharleroiRotterdamRidderkerkHillegomNamurIJsselsteinMolMaarssenAndenneUtrechtMedemblikMarche-en-FamenneFlémalle-HauteLiègeBarneveldNijmegenVenrayEupenAachenVenloEsch-sur-AlzetteLuxembourgThionvilleMönchengladbachJüchenMetzWeselBergheimDún LaoghaireTrierPulheimDublinGroningenBorkenKölnDillingenEnschedeBonnVölklingenSaarbrückenDattelnLingenWaterfordDortmundHagenNeuwiedEmdenSchwerteBendorfKoblenzLüdenscheidMünsterUnnaKaiserslauternBad KreuznachFriesoytheLimburg an der LahnNetphenSoestOsnabrückWiesbadenMainzWilhelmshavenOldenburgBaden-BadenEindhovenTilburgGelsenkirchenBottropLeverkusenBredaValenciennesKrefeldDenainDuisburgDüsseldorfEssenJülichHasseltOberhausenRatingenWuppertalAarschotHouthalenGrimbergenMechelenWillebroekHeerlenDouaiHattingenZaventemZwijndrechtBoulogne-sur-MerAntwerpBeverenEvergemKapellenRoeselareStabroekCarlowBrusselsIzegemMonsKortrijkLochristiGentBirminghamMenenRixensartDartfordGraysBexleyLe HavreLondonDagenham
7 Jan89101112131415
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

CarlowCarlow, 7 January: 4.0 µg/m³, 0.6× usualCarlow, 8 January: 15.5 µg/m³, 2.3× usualCarlow, 9 January: 35.6 µg/m³, 5.3× usualCarlow, 10 January: 25.5 µg/m³, 3.8× usualCarlow, 11 January: 13.0 µg/m³, 1.9× usualCarlow, 12 January: 10.2 µg/m³, 1.5× usualCarlow, 13 January: no readingCarlow, 14 January: 21.2 µg/m³, 3.2× usualCarlow, 15 January: 8.4 µg/m³, 1.3× usualBirminghamBirmingham, 7 January: no readingBirmingham, 8 January: 22.0 µg/m³, 3.1× usualBirmingham, 9 January: 21.2 µg/m³, 3.0× usualBirmingham, 10 January: 31.1 µg/m³, 4.4× usualBirmingham, 11 January: no readingBirmingham, 12 January: no readingBirmingham, 13 January: no readingBirmingham, 14 January: no readingBirmingham, 15 January: no readingGraysGrays, 7 January: 6.8 µg/m³, 0.9× usualGrays, 8 January: 8.7 µg/m³, 1.1× usualGrays, 9 January: 14.8 µg/m³, 1.9× usualGrays, 10 January: 29.4 µg/m³, 3.7× usualGrays, 11 January: 40.5 µg/m³, 5.1× usualGrays, 12 January: 29.6 µg/m³, 3.7× usualGrays, 13 January: 14.1 µg/m³, 1.8× usualGrays, 14 January: 14.7 µg/m³, 1.9× usualGrays, 15 January: 15.1 µg/m³, 1.9× usualDagenhamDagenham, 7 January: 4.9 µg/m³, 0.8× usualDagenham, 8 January: 8.8 µg/m³, 1.5× usualDagenham, 9 January: 11.4 µg/m³, 1.9× usualDagenham, 10 January: 28.1 µg/m³, 4.8× usualDagenham, 11 January: 36.3 µg/m³, 6.2× usualDagenham, 12 January: 27.6 µg/m³, 4.7× usualDagenham, 13 January: 8.3 µg/m³, 1.4× usualDagenham, 14 January: 9.9 µg/m³, 1.7× usualDagenham, 15 January: 8.9 µg/m³, 1.5× usualBexleyBexley, 7 January: 3.9 µg/m³, 0.5× usualBexley, 8 January: 6.6 µg/m³, 0.9× usualBexley, 9 January: 12.6 µg/m³, 1.6× usualBexley, 10 January: 27.9 µg/m³, 3.6× usualBexley, 11 January: 44.1 µg/m³, 5.7× usualBexley, 12 January: 24.8 µg/m³, 3.2× usualBexley, 13 January: 9.8 µg/m³, 1.3× usualBexley, 14 January: 12.8 µg/m³, 1.7× usualBexley, 15 January: 12.0 µg/m³, 1.6× usualLondonLondon, 7 January: 6.0 µg/m³, 0.8× usualLondon, 8 January: 10.1 µg/m³, 1.3× usualLondon, 9 January: 13.6 µg/m³, 1.7× usualLondon, 10 January: 25.3 µg/m³, 3.2× usualLondon, 11 January: 46.0 µg/m³, 5.8× usualLondon, 12 January: 36.2 µg/m³, 4.5× usualLondon, 13 January: 10.0 µg/m³, 1.3× usualLondon, 14 January: 12.7 µg/m³, 1.6× usualLondon, 15 January: 12.7 µg/m³, 1.6× usualIzegemIzegem, 7 January: 6.2 µg/m³, 0.5× usualIzegem, 8 January: 12.6 µg/m³, 1.1× usualIzegem, 9 January: 8.9 µg/m³, 0.7× usualIzegem, 10 January: 22.0 µg/m³, 1.8× usualIzegem, 11 January: 46.9 µg/m³, 3.9× usualIzegem, 12 January: 27.6 µg/m³, 2.3× usualIzegem, 13 January: no readingIzegem, 14 January: 40.9 µg/m³, 3.4× usualIzegem, 15 January: 33.6 µg/m³, 2.8× usualMenenMenen, 7 January: 3.3 µg/m³, 0.3× usualMenen, 8 January: 10.2 µg/m³, 1.0× usualMenen, 9 January: 10.4 µg/m³, 1.0× usualMenen, 10 January: 22.0 µg/m³, 2.2× usualMenen, 11 January: 46.5 µg/m³, 4.6× usualMenen, 12 January: 30.7 µg/m³, 3.0× usualMenen, 13 January: no readingMenen, 14 January: 39.7 µg/m³, 3.9× usualMenen, 15 January: 36.9 µg/m³, 3.6× usualKortrijkKortrijk, 7 January: 3.3 µg/m³, 0.3× usualKortrijk, 8 January: 8.7 µg/m³, 0.9× usualKortrijk, 9 January: 10.0 µg/m³, 1.0× usualKortrijk, 10 January: 22.1 µg/m³, 2.2× usualKortrijk, 11 January: 40.4 µg/m³, 4.1× usualKortrijk, 12 January: 29.5 µg/m³, 3.0× usualKortrijk, 13 January: no readingKortrijk, 14 January: 34.8 µg/m³, 3.5× usualKortrijk, 15 January: 30.7 µg/m³, 3.1× usualLochristiLochristi, 7 January: 3.8 µg/m³, 0.4× usualLochristi, 8 January: 9.2 µg/m³, 1.0× usualLochristi, 9 January: 8.0 µg/m³, 0.9× usualLochristi, 10 January: 16.9 µg/m³, 1.8× usualLochristi, 11 January: 38.8 µg/m³, 4.2× usualLochristi, 12 January: 18.2 µg/m³, 2.0× usualLochristi, 13 January: no readingLochristi, 14 January: 32.0 µg/m³, 3.5× usualLochristi, 15 January: 31.8 µg/m³, 3.5× usualGentGent, 7 January: 3.3 µg/m³, 0.4× usualGent, 8 January: 7.9 µg/m³, 0.9× usualGent, 9 January: 8.7 µg/m³, 1.0× usualGent, 10 January: 17.5 µg/m³, 2.0× usualGent, 11 January: 38.0 µg/m³, 4.3× usualGent, 12 January: 21.1 µg/m³, 2.4× usualGent, 13 January: no readingGent, 14 January: 30.6 µg/m³, 3.4× usualGent, 15 January: 34.4 µg/m³, 3.9× usualRoeselareRoeselare, 7 January: 3.3 µg/m³, 0.3× usualRoeselare, 8 January: 9.3 µg/m³, 0.9× usualRoeselare, 9 January: 7.9 µg/m³, 0.8× usualRoeselare, 10 January: 18.1 µg/m³, 1.8× usualRoeselare, 11 January: 37.3 µg/m³, 3.8× usualRoeselare, 12 January: 17.8 µg/m³, 1.8× usualRoeselare, 13 January: no readingRoeselare, 14 January: 36.3 µg/m³, 3.7× usualRoeselare, 15 January: 28.1 µg/m³, 2.8× usualEvergemEvergem, 7 January: 3.3 µg/m³, 0.3× usualEvergem, 8 January: 8.2 µg/m³, 0.8× usualEvergem, 9 January: 6.0 µg/m³, 0.6× usualEvergem, 10 January: 14.9 µg/m³, 1.5× usualEvergem, 11 January: 37.3 µg/m³, 3.8× usualEvergem, 12 January: 16.4 µg/m³, 1.7× usualEvergem, 13 January: no readingEvergem, 14 January: 29.2 µg/m³, 3.0× usualEvergem, 15 January: 27.3 µg/m³, 2.8× usualLe HavreLe Havre, 7 January: 4.5 µg/m³, 0.5× usualLe Havre, 8 January: 9.3 µg/m³, 1.0× usualLe Havre, 9 January: 4.9 µg/m³, 0.5× usualLe Havre, 10 January: 10.0 µg/m³, 1.1× usualLe Havre, 11 January: 36.7 µg/m³, 4.0× usualLe Havre, 12 January: 52.8 µg/m³, 5.8× usualLe Havre, 13 January: no readingLe Havre, 14 January: 41.4 µg/m³, 4.5× usualLe Havre, 15 January: no readingBoulogne-sur-MerBoulogne-sur-Mer, 7 January: 5.3 µg/m³, 0.6× usualBoulogne-sur-Mer, 8 January: 6.8 µg/m³, 0.7× usualBoulogne-sur-Mer, 9 January: 5.7 µg/m³, 0.6× usualBoulogne-sur-Mer, 10 January: 14.2 µg/m³, 1.5× usualBoulogne-sur-Mer, 11 January: 36.7 µg/m³, 3.8× usualBoulogne-sur-Mer, 12 January: 23.3 µg/m³, 2.4× usualBoulogne-sur-Mer, 13 January: no readingBoulogne-sur-Mer, 14 January: no readingBoulogne-sur-Mer, 15 January: no readingDartfordDartford, 7 January: 5.7 µg/m³, 0.8× usualDartford, 8 January: 9.5 µg/m³, 1.3× usualDartford, 9 January: 12.8 µg/m³, 1.8× usualDartford, 10 January: 21.3 µg/m³, 3.0× usualDartford, 11 January: 35.7 µg/m³, 5.0× usualDartford, 12 January: 10.4 µg/m³, 1.5× usualDartford, 13 January: 10.2 µg/m³, 1.4× usualDartford, 14 January: 12.5 µg/m³, 1.8× usualDartford, 15 January: 11.5 µg/m³, 1.6× usualBeverenBeveren, 7 January: 3.1 µg/m³, 0.3× usualBeveren, 8 January: 7.2 µg/m³, 0.8× usualBeveren, 9 January: 6.7 µg/m³, 0.7× usualBeveren, 10 January: 16.3 µg/m³, 1.8× usualBeveren, 11 January: 35.7 µg/m³, 3.8× usualBeveren, 12 January: 21.7 µg/m³, 2.3× usualBeveren, 13 January: no readingBeveren, 14 January: 30.0 µg/m³, 3.2× usualBeveren, 15 January: 33.1 µg/m³, 3.6× usualKapellenKapellen, 7 January: 3.0 µg/m³, 0.3× usualKapellen, 8 January: 7.4 µg/m³, 0.8× usualKapellen, 9 January: 5.6 µg/m³, 0.6× usualKapellen, 10 January: no readingKapellen, 11 January: 35.0 µg/m³, 3.8× usualKapellen, 12 January: 19.1 µg/m³, 2.1× usualKapellen, 13 January: no readingKapellen, 14 January: 27.7 µg/m³, 3.0× usualKapellen, 15 January: 29.7 µg/m³, 3.2× usualAntwerpAntwerp, 7 January: 3.4 µg/m³, 0.4× usualAntwerp, 8 January: 7.2 µg/m³, 0.8× usualAntwerp, 9 January: 7.3 µg/m³, 0.8× usualAntwerp, 10 January: 16.0 µg/m³, 1.8× usualAntwerp, 11 January: 34.4 µg/m³, 3.8× usualAntwerp, 12 January: 18.4 µg/m³, 2.0× usualAntwerp, 13 January: no readingAntwerp, 14 January: 27.4 µg/m³, 3.0× usualAntwerp, 15 January: 36.4 µg/m³, 4.0× usualStabroekStabroek, 7 January: 2.8 µg/m³, 0.3× usualStabroek, 8 January: 7.4 µg/m³, 0.9× usualStabroek, 9 January: 5.1 µg/m³, 0.6× usualStabroek, 10 January: 14.3 µg/m³, 1.7× usualStabroek, 11 January: 32.6 µg/m³, 3.8× usualStabroek, 12 January: 13.8 µg/m³, 1.6× usualStabroek, 13 January: no readingStabroek, 14 January: 26.5 µg/m³, 3.1× usualStabroek, 15 January: 27.7 µg/m³, 3.2× usualZwijndrechtZwijndrecht, 7 January: 2.7 µg/m³, 0.3× usualZwijndrecht, 8 January: 7.0 µg/m³, 0.8× usualZwijndrecht, 9 January: 6.3 µg/m³, 0.7× usualZwijndrecht, 10 January: 14.2 µg/m³, 1.6× usualZwijndrecht, 11 January: 31.4 µg/m³, 3.6× usualZwijndrecht, 12 January: 13.7 µg/m³, 1.6× usualZwijndrecht, 13 January: no readingZwijndrecht, 14 January: 27.2 µg/m³, 3.1× usualZwijndrecht, 15 January: 28.5 µg/m³, 3.2× usualDouaiDouai, 7 January: 1.9 µg/m³, 0.2× usualDouai, 8 January: 6.1 µg/m³, 0.6× usualDouai, 9 January: 8.7 µg/m³, 0.9× usualDouai, 10 January: 21.0 µg/m³, 2.1× usualDouai, 11 January: 29.9 µg/m³, 3.1× usualDouai, 12 January: 32.3 µg/m³, 3.3× usualDouai, 13 January: no readingDouai, 14 January: 29.9 µg/m³, 3.1× usualDouai, 15 January: no readingZaventemZaventem, 7 January: 2.6 µg/m³, 0.3× usualZaventem, 8 January: 6.2 µg/m³, 0.7× usualZaventem, 9 January: 9.0 µg/m³, 1.0× usualZaventem, 10 January: 17.2 µg/m³, 2.0× usualZaventem, 11 January: 29.3 µg/m³, 3.4× usualZaventem, 12 January: 29.4 µg/m³, 3.4× usualZaventem, 13 January: no readingZaventem, 14 January: 22.6 µg/m³, 2.6× usualZaventem, 15 January: 38.7 µg/m³, 4.4× usualBredaBreda, 7 January: 3.0 µg/m³, 0.3× usualBreda, 8 January: 7.3 µg/m³, 0.7× usualBreda, 9 January: 5.9 µg/m³, 0.5× usualBreda, 10 January: 8.9 µg/m³, 0.8× usualBreda, 11 January: 28.7 µg/m³, 2.6× usualBreda, 12 January: 10.9 µg/m³, 1.0× usualBreda, 13 January: 20.5 µg/m³, 1.9× usualBreda, 14 January: 28.1 µg/m³, 2.6× usualBreda, 15 January: 14.4 µg/m³, 1.3× usualGrimbergenGrimbergen, 7 January: 3.0 µg/m³, 0.3× usualGrimbergen, 8 January: 7.2 µg/m³, 0.7× usualGrimbergen, 9 January: 8.8 µg/m³, 0.9× usualGrimbergen, 10 January: 16.8 µg/m³, 1.6× usualGrimbergen, 11 January: 28.4 µg/m³, 2.8× usualGrimbergen, 12 January: 30.7 µg/m³, 3.0× usualGrimbergen, 13 January: no readingGrimbergen, 14 January: 26.3 µg/m³, 2.6× usualGrimbergen, 15 January: 40.3 µg/m³, 3.9× usualBottropBottrop, 7 January: 3.2 µg/m³, 0.3× usualBottrop, 8 January: 6.4 µg/m³, 0.6× usualBottrop, 9 January: 6.8 µg/m³, 0.6× usualBottrop, 10 January: 15.7 µg/m³, 1.5× usualBottrop, 11 January: 28.3 µg/m³, 2.6× usualBottrop, 12 January: 18.3 µg/m³, 1.7× usualBottrop, 13 January: no readingBottrop, 14 January: 17.1 µg/m³, 1.6× usualBottrop, 15 January: 29.2 µg/m³, 2.7× usualWuppertalWuppertal, 7 January: 3.1 µg/m³, 0.3× usualWuppertal, 8 January: 5.0 µg/m³, 0.5× usualWuppertal, 9 January: 6.5 µg/m³, 0.7× usualWuppertal, 10 January: 14.7 µg/m³, 1.5× usualWuppertal, 11 January: 28.2 µg/m³, 2.9× usualWuppertal, 12 January: 21.0 µg/m³, 2.2× usualWuppertal, 13 January: no readingWuppertal, 14 January: 14.7 µg/m³, 1.5× usualWuppertal, 15 January: 19.8 µg/m³, 2.0× usualHattingenHattingen, 7 January: 1.9 µg/m³, 0.2× usualHattingen, 8 January: 4.1 µg/m³, 0.5× usualHattingen, 9 January: 7.1 µg/m³, 0.8× usualHattingen, 10 January: 14.0 µg/m³, 1.6× usualHattingen, 11 January: 28.1 µg/m³, 3.3× usualHattingen, 12 January: 18.0 µg/m³, 2.1× usualHattingen, 13 January: no readingHattingen, 14 January: 11.6 µg/m³, 1.4× usualHattingen, 15 January: 17.5 µg/m³, 2.1× usualTilburgTilburg, 7 January: 4.6 µg/m³, 0.4× usualTilburg, 8 January: 8.8 µg/m³, 0.7× usualTilburg, 9 January: 7.1 µg/m³, 0.6× usualTilburg, 10 January: 11.3 µg/m³, 0.9× usualTilburg, 11 January: 28.0 µg/m³, 2.3× usualTilburg, 12 January: 12.4 µg/m³, 1.0× usualTilburg, 13 January: 22.4 µg/m³, 1.9× usualTilburg, 14 January: 30.8 µg/m³, 2.6× usualTilburg, 15 January: 14.7 µg/m³, 1.2× usualKrefeldKrefeld, 7 January: 2.5 µg/m³, 0.2× usualKrefeld, 8 January: 5.9 µg/m³, 0.6× usualKrefeld, 9 January: 7.9 µg/m³, 0.8× usualKrefeld, 10 January: 15.2 µg/m³, 1.5× usualKrefeld, 11 January: 27.9 µg/m³, 2.7× usualKrefeld, 12 January: 13.2 µg/m³, 1.3× usualKrefeld, 13 January: no readingKrefeld, 14 January: 17.8 µg/m³, 1.7× usualKrefeld, 15 January: 26.6 µg/m³, 2.6× usualOberhausenOberhausen, 7 January: 3.1 µg/m³, 0.3× usualOberhausen, 8 January: 5.8 µg/m³, 0.6× usualOberhausen, 9 January: 7.5 µg/m³, 0.8× usualOberhausen, 10 January: 14.5 µg/m³, 1.5× usualOberhausen, 11 January: 27.7 µg/m³, 2.9× usualOberhausen, 12 January: 17.5 µg/m³, 1.8× usualOberhausen, 13 January: no readingOberhausen, 14 January: 15.9 µg/m³, 1.6× usualOberhausen, 15 January: 29.8 µg/m³, 3.1× usualDüsseldorfDüsseldorf, 7 January: 2.1 µg/m³, 0.2× usualDüsseldorf, 8 January: 4.8 µg/m³, 0.5× usualDüsseldorf, 9 January: 7.1 µg/m³, 0.7× usualDüsseldorf, 10 January: 14.1 µg/m³, 1.4× usualDüsseldorf, 11 January: 27.7 µg/m³, 2.8× usualDüsseldorf, 12 January: 19.3 µg/m³, 1.9× usualDüsseldorf, 13 January: no readingDüsseldorf, 14 January: 18.7 µg/m³, 1.9× usualDüsseldorf, 15 January: 25.0 µg/m³, 2.5× usualDuisburgDuisburg, 7 January: 2.5 µg/m³, 0.3× usualDuisburg, 8 January: 5.7 µg/m³, 0.6× usualDuisburg, 9 January: 7.3 µg/m³, 0.7× usualDuisburg, 10 January: 14.7 µg/m³, 1.5× usualDuisburg, 11 January: 27.5 µg/m³, 2.8× usualDuisburg, 12 January: 15.8 µg/m³, 1.6× usualDuisburg, 13 January: no readingDuisburg, 14 January: 16.8 µg/m³, 1.7× usualDuisburg, 15 January: 28.3 µg/m³, 2.9× usualWillebroekWillebroek, 7 January: 2.7 µg/m³, 0.3× usualWillebroek, 8 January: 5.9 µg/m³, 0.7× usualWillebroek, 9 January: 7.0 µg/m³, 0.8× usualWillebroek, 10 January: 14.6 µg/m³, 1.8× usualWillebroek, 11 January: 26.8 µg/m³, 3.2× usualWillebroek, 12 January: 25.3 µg/m³, 3.0× usualWillebroek, 13 January: no readingWillebroek, 14 January: 23.1 µg/m³, 2.8× usualWillebroek, 15 January: 36.2 µg/m³, 4.4× usualEssenEssen, 7 January: 2.6 µg/m³, 0.3× usualEssen, 8 January: 5.5 µg/m³, 0.6× usualEssen, 9 January: 7.1 µg/m³, 0.7× usualEssen, 10 January: 15.2 µg/m³, 1.6× usualEssen, 11 January: 26.6 µg/m³, 2.8× usualEssen, 12 January: 15.5 µg/m³, 1.6× usualEssen, 13 January: no readingEssen, 14 January: 14.8 µg/m³, 1.6× usualEssen, 15 January: 25.3 µg/m³, 2.7× usualEindhovenEindhoven, 7 January: 3.5 µg/m³, 0.3× usualEindhoven, 8 January: 5.6 µg/m³, 0.5× usualEindhoven, 9 January: 7.3 µg/m³, 0.6× usualEindhoven, 10 January: 16.4 µg/m³, 1.3× usualEindhoven, 11 January: 26.5 µg/m³, 2.1× usualEindhoven, 12 January: 15.9 µg/m³, 1.3× usualEindhoven, 13 January: 18.7 µg/m³, 1.5× usualEindhoven, 14 January: 26.8 µg/m³, 2.2× usualEindhoven, 15 January: 20.2 µg/m³, 1.6× usualGelsenkirchenGelsenkirchen, 7 January: 5.0 µg/m³, 0.5× usualGelsenkirchen, 8 January: 6.9 µg/m³, 0.7× usualGelsenkirchen, 9 January: 9.3 µg/m³, 0.9× usualGelsenkirchen, 10 January: 15.8 µg/m³, 1.5× usualGelsenkirchen, 11 January: 26.4 µg/m³, 2.5× usualGelsenkirchen, 12 January: 16.5 µg/m³, 1.6× usualGelsenkirchen, 13 January: no readingGelsenkirchen, 14 January: 16.6 µg/m³, 1.6× usualGelsenkirchen, 15 January: 25.3 µg/m³, 2.4× usualRatingenRatingen, 7 January: 1.9 µg/m³, 0.2× usualRatingen, 8 January: 4.3 µg/m³, 0.5× usualRatingen, 9 January: 6.9 µg/m³, 0.8× usualRatingen, 10 January: 13.5 µg/m³, 1.5× usualRatingen, 11 January: 26.1 µg/m³, 2.9× usualRatingen, 12 January: 15.4 µg/m³, 1.7× usualRatingen, 13 January: no readingRatingen, 14 January: 15.4 µg/m³, 1.7× usualRatingen, 15 January: 23.7 µg/m³, 2.6× usualLeverkusenLeverkusen, 7 January: 2.6 µg/m³, 0.3× usualLeverkusen, 8 January: 4.5 µg/m³, 0.5× usualLeverkusen, 9 January: 7.8 µg/m³, 0.8× usualLeverkusen, 10 January: 12.0 µg/m³, 1.3× usualLeverkusen, 11 January: 25.0 µg/m³, 2.6× usualLeverkusen, 12 January: 23.8 µg/m³, 2.5× usualLeverkusen, 13 January: no readingLeverkusen, 14 January: 16.5 µg/m³, 1.7× usualLeverkusen, 15 January: 23.6 µg/m³, 2.5× usualRixensartRixensart, 7 January: 2.4 µg/m³, 0.3× usualRixensart, 8 January: 6.6 µg/m³, 0.7× usualRixensart, 9 January: 9.2 µg/m³, 1.0× usualRixensart, 10 January: 17.9 µg/m³, 2.0× usualRixensart, 11 January: 23.6 µg/m³, 2.7× usualRixensart, 12 January: 42.3 µg/m³, 4.8× usualRixensart, 13 January: no readingRixensart, 14 January: 31.1 µg/m³, 3.5× usualRixensart, 15 January: 30.0 µg/m³, 3.4× usualBrusselsBrussels, 7 January: 2.2 µg/m³, 0.3× usualBrussels, 8 January: 5.6 µg/m³, 0.7× usualBrussels, 9 January: 8.1 µg/m³, 1.0× usualBrussels, 10 January: 14.4 µg/m³, 1.8× usualBrussels, 11 January: 23.0 µg/m³, 2.9× usualBrussels, 12 January: 30.5 µg/m³, 3.9× usualBrussels, 13 January: no readingBrussels, 14 January: 22.1 µg/m³, 2.8× usualBrussels, 15 January: 33.5 µg/m³, 4.2× usualDenainDenain, 7 January: 1.8 µg/m³, 0.2× usualDenain, 8 January: 5.8 µg/m³, 0.6× usualDenain, 9 January: 7.3 µg/m³, 0.7× usualDenain, 10 January: 15.7 µg/m³, 1.5× usualDenain, 11 January: 20.2 µg/m³, 1.9× usualDenain, 12 January: 29.6 µg/m³, 2.8× usualDenain, 13 January: no readingDenain, 14 January: 26.7 µg/m³, 2.6× usualDenain, 15 January: 39.5 µg/m³, 3.8× usualMonsMons, 7 January: no readingMons, 8 January: 4.6 µg/m³, 0.6× usualMons, 9 January: 5.4 µg/m³, 0.8× usualMons, 10 January: 16.0 µg/m³, 2.3× usualMons, 11 January: 18.9 µg/m³, 2.7× usualMons, 12 January: 29.1 µg/m³, 4.1× usualMons, 13 January: no readingMons, 14 January: 28.1 µg/m³, 4.0× usualMons, 15 January: 39.8 µg/m³, 5.6× usualMechelenMechelen, 7 January: 2.7 µg/m³, 0.3× usualMechelen, 8 January: 6.0 µg/m³, 0.6× usualMechelen, 9 January: 8.0 µg/m³, 0.9× usualMechelen, 10 January: 15.1 µg/m³, 1.6× usualMechelen, 11 January: 24.6 µg/m³, 2.6× usualMechelen, 12 January: 28.8 µg/m³, 3.1× usualMechelen, 13 January: no readingMechelen, 14 January: 23.9 µg/m³, 2.5× usualMechelen, 15 January: 38.2 µg/m³, 4.1× usualHasseltHasselt, 7 January: 1.9 µg/m³, 0.2× usualHasselt, 8 January: 4.7 µg/m³, 0.5× usualHasselt, 9 January: 7.9 µg/m³, 0.8× usualHasselt, 10 January: 14.1 µg/m³, 1.4× usualHasselt, 11 January: 20.8 µg/m³, 2.1× usualHasselt, 12 January: 28.8 µg/m³, 2.9× usualHasselt, 13 January: no readingHasselt, 14 January: 20.3 µg/m³, 2.1× usualHasselt, 15 January: 30.8 µg/m³, 3.1× usualHouthalenHouthalen, 7 January: 2.2 µg/m³, 0.2× usualHouthalen, 8 January: 5.8 µg/m³, 0.6× usualHouthalen, 9 January: 7.9 µg/m³, 0.8× usualHouthalen, 10 January: 14.5 µg/m³, 1.5× usualHouthalen, 11 January: 20.0 µg/m³, 2.1× usualHouthalen, 12 January: 28.5 µg/m³, 3.0× usualHouthalen, 13 January: no readingHouthalen, 14 January: 21.3 µg/m³, 2.2× usualHouthalen, 15 January: 30.4 µg/m³, 3.2× usualValenciennesValenciennes, 7 January: 2.0 µg/m³, 0.2× usualValenciennes, 8 January: 4.7 µg/m³, 0.5× usualValenciennes, 9 January: 8.0 µg/m³, 0.8× usualValenciennes, 10 January: 14.3 µg/m³, 1.5× usualValenciennes, 11 January: 21.3 µg/m³, 2.2× usualValenciennes, 12 January: 26.3 µg/m³, 2.7× usualValenciennes, 13 January: no readingValenciennes, 14 January: 24.1 µg/m³, 2.5× usualValenciennes, 15 January: no readingHeerlenHeerlen, 7 January: 2.2 µg/m³, 0.3× usualHeerlen, 8 January: 4.7 µg/m³, 0.6× usualHeerlen, 9 January: 6.3 µg/m³, 0.8× usualHeerlen, 10 January: 12.8 µg/m³, 1.6× usualHeerlen, 11 January: 19.8 µg/m³, 2.5× usualHeerlen, 12 January: 26.0 µg/m³, 3.3× usualHeerlen, 13 January: 15.0 µg/m³, 1.9× usualHeerlen, 14 January: 16.6 µg/m³, 2.1× usualHeerlen, 15 January: 17.0 µg/m³, 2.2× usualJülichJülich, 7 January: 2.1 µg/m³, 0.2× usualJülich, 8 January: 3.9 µg/m³, 0.4× usualJülich, 9 January: 5.9 µg/m³, 0.7× usualJülich, 10 January: 12.6 µg/m³, 1.4× usualJülich, 11 January: 21.0 µg/m³, 2.4× usualJülich, 12 January: 25.7 µg/m³, 2.9× usualJülich, 13 January: no readingJülich, 14 January: 21.0 µg/m³, 2.4× usualJülich, 15 January: 16.0 µg/m³, 1.8× usualAarschotAarschot, 7 January: 2.1 µg/m³, 0.2× usualAarschot, 8 January: 5.6 µg/m³, 0.7× usualAarschot, 9 January: 7.3 µg/m³, 0.8× usualAarschot, 10 January: 13.7 µg/m³, 1.6× usualAarschot, 11 January: 21.9 µg/m³, 2.5× usualAarschot, 12 January: 25.5 µg/m³, 3.0× usualAarschot, 13 January: no readingAarschot, 14 January: 21.5 µg/m³, 2.5× usualAarschot, 15 January: 25.5 µg/m³, 3.0× usual7 Jan89101112131415
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
DagenhamEngland, United Kingdom3 36.311 January5.96.2×
Le HavreNormandy, France2 52.812 January9.15.8×
LondonEngland, United Kingdom3 46.011 January8.05.8×
BexleyEngland, United Kingdom2 44.111 January7.75.7×
MonsWallonia, Belgium1 39.815 January7.15.6×
CarlowLeinster, Ireland1 35.69 January6.75.3×
GraysEngland, United Kingdom3 40.511 January7.95.1×
DartfordEngland, United Kingdom1 35.711 January7.15.0×
RixensartWallonia, Belgium1 42.312 January8.94.8×
MenenFlanders, Belgium2 46.511 January10.24.6×
ZaventemFlanders, Belgium2 38.715 January8.74.4×
BirminghamEngland, United Kingdom1 31.110 January7.04.4×
WillebroekFlanders, Belgium2 36.215 January8.34.4×
GentFlanders, Belgium1 38.011 January8.94.3×
BrusselsBrussels Capital, Belgium1 33.515 January7.94.2×
LochristiFlanders, Belgium1 38.811 January9.24.2×
KortrijkFlanders, Belgium2 40.411 January9.94.1×
MechelenFlanders, Belgium1 38.215 January9.44.1×
AntwerpFlanders, Belgium1 36.415 January9.14.0×
GrimbergenFlanders, Belgium2 40.315 January10.33.9×
IzegemFlanders, Belgium2 46.911 January12.03.9×
EvergemFlanders, Belgium1 37.311 January9.73.8×
BeverenFlanders, Belgium1 35.711 January9.33.8×
Boulogne-sur-MerHauts-de-France, France1 36.711 January9.63.8×
KapellenFlanders, Belgium1 35.011 January9.23.8×
DenainHauts-de-France, France1 39.515 January10.43.8×
StabroekFlanders, Belgium1 32.611 January8.63.8×
RoeselareFlanders, Belgium1 37.311 January9.93.8×
ZwijndrechtFlanders, Belgium1 31.411 January8.83.6×
HattingenNorth Rhine-Westphalia, Germany1 28.111 January8.53.3×
DouaiHauts-de-France, France2 32.312 January9.83.3×
HeerlenLimburg, The Netherlands1 26.012 January7.93.3×
HouthalenFlanders, Belgium1 30.415 January9.63.2×
HasseltFlanders, Belgium1 30.815 January9.93.1×
OberhausenNorth Rhine-Westphalia, Germany1 29.815 January9.73.1×
AarschotFlanders, Belgium1 25.512 January8.63.0×
WuppertalNorth Rhine-Westphalia, Germany1 28.211 January9.72.9×
DuisburgNorth Rhine-Westphalia, Germany1 28.315 January9.82.9×
JülichNorth Rhine-Westphalia, Germany1 25.712 January8.92.9×
RatingenNorth Rhine-Westphalia, Germany1 26.111 January9.12.9×
EssenNorth Rhine-Westphalia, Germany1 26.611 January9.52.8×
DüsseldorfNorth Rhine-Westphalia, Germany1 27.711 January10.02.8×
BottropNorth Rhine-Westphalia, Germany1 29.215 January10.82.7×
ValenciennesHauts-de-France, France1 26.312 January9.82.7×
KrefeldNorth Rhine-Westphalia, Germany1 27.911 January10.42.7×
BredaNorth Brabant, The Netherlands1 28.711 January10.92.6×
LeverkusenNorth Rhine-Westphalia, Germany1 25.011 January9.62.6×
TilburgNorth Brabant, The Netherlands1 30.814 January12.02.6×
GelsenkirchenNorth Rhine-Westphalia, Germany1 26.411 January10.52.5×
EindhovenNorth Brabant, The Netherlands1 26.814 January12.42.2×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in Belgium and Germany

Number 19 of 35 episodes in Belgium and Germany since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 35.

Use this page

SmogRank, Western Europe, January 2025: 50 cities with PM2.5 at twice their usual or more, 10 to 12 January 2025, smogrank.com/episodes/2025-01-western-europe (accessed 3 October 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.