SmogRank / Episodes / Poland

Europe, 17 to 22 March 2023

For 6 days, from 17 to 22 March 2023, 64 cities in Poland, Czechia, Italy and 5 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Kościan, Greater Poland, Poland: 71.8 µg/m³ on 19 March, about 3.0× its usual 24.0. Readings stopped after 22 March, so this episode may have run longer.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached64in 8 countries
Days617 to 22 March 2023
Worst day19 March36 cities counted
Furthest above usual5.0×Alessandria

Day by day

19 March 36 cities at twice their usual or more
Hradec KrálovéPardubiceLwówek ŚląskiKłodzkoLiberecŽďár nad SázavouBogatyniaMoravská TřebováJihlavaWrocławŻaryNysaBrnoZielona GóraŽideniceSlatinaMikulovPřerovKroměřížMiędzyrzeczCottbusOpoleHodonínHraniceEisenhüttenstadtOpavaČeské BudějoviceTullnZlínKlosterneuburgFrankfurt (Oder)Sankt PöltenValašské MeziříčíStudénkaGorzów WielkopolskiKędzierzyn-KoźleViennaSenicaMalackyRacibórzLubnjowGroß-EnzersdorfPerchtoldsdorfMödlingOstravaBadenKaliszDevínska Nová VesBad VöslauAmstettenPezinokHavířovBratislavaTrenčínSankt ValentinTrnavaLinzKarvináEisenstadtSenecJastrzębie ZdrójPúchovAnsfeldenTraunČeský TěšínCieszynSteyrSereďStrausbergTřinecKönigs WusterhausenSchöneicheWelsNeuenhagenSchwedt (Oder)ČadcaBlankenfelde-MahlowNitraMahlowPartizánskeŽilinaEberswaldePassauKatowiceNakło nad NoteciąLuckenwaldeBernau bei BerlinBerlinBielsko-BialaSzczecinPrievidzaTeltowSokolovKleinmachnowWeizGyőrAttnang-PuchheimKolárovoMartinHandlováBydgoszczPotsdamŁaskFalkenseeAltenburgDallgow-DöberitzŽiar nad HronomWittenbergKomárnoVoitsbergRadomskoNauenRužomberokBanská BystricaGreizLeibnitzBitterfeld-WolfenZgierzZvolenŚwinoujścieŁódźWolfsbergWeidenMarktredwitzBurghausenBrandenburg an der HavelEsztergomNeuruppinMariborVeszprémSchwandorf in BayernLiptovský MikulášWeißenfelsNeubrandenburgHalle (Saale)PtujWłoszczowaKöthenTrostberg an der AlzTraunreutKlagenfurt am WörtherseeUstkaKelheimCeljeSaalfelden am Steinernen MeerJenaLučenecBurg bei MagdeburgTrbovljeKoprivnicaNeustadt an der DonauSaalfeldMagdeburgMalchowWeimarRevúcaPopradLjubljanaDunaújvárosVeľká LomnicaKiefersfeldenStralsundNovo MestoSopotIngolstadtŻyrardówWittenbergeSmižanyErfurtSpišská Nová VesMunichNurembergCoburgGüstrowPécsBambergHalberstadtTarnówBützowStarnbergPruszkówRostockNordhausenStarachowiceSuhlLudwigslustKazincbarcikaHansestadt SalzwedelRadomRijekaKoperAugsburgAnsbachKonstancin-JeziornaSchwerinMeiningenMühlhausenBardejovOettingen in BayernMielecDębicaInnsbruckPrešovBad WindsheimLiberpolisWismarOtwockEisenachGoslarKošiceBraunschweigBihaćSalzgitterBanja LukaMalmöWürzburgVranov nad TopľouSzegedAalenGöttingenBolzanoWitzenhausenLaivesTrebišovRzeszówHildesheimKalmarLübeckHumennéFuldaKempten (Allgäu)NiskoNeu-UlmLauda-KönigshofenUlmBorgo ValsuganaSninaHannoverKasselBiberach an der RißHamburgTrappenkampAschaffenburgJarosławHeilbronnGroßostheimLindauLudwigsburgPrzemyślKielFilderstadtStuttgartReutlingenHanau am MainFriedrichshafenRintelnMarsbergTübingenMarburg an der LahnGießenFrankfurt am MainPesaroItzehoeDarmstadtHerrenbergHeidelbergKonstanzWieslochKreuzlingenBelgradeBensheimEschbornOytenZamośćPforzheimSulzbachKlaipėdaMostarHattersheimKönigstein im TaunusJesiPorto Potenza PicenaLampertheimRüsselsheim am MainMannheimCivitanova MarcheLudwigshafen am RheinBielefeldVisbyBremenSpeyerWormsWarsteinEggenstein-LeopoldshafenMainzKarlsruheWiesbadenDelmenhorstBiałystokLemwerderFlensburgVillingen-SchwenningenNetphenAugustówLimburg an der LahnBaden-BadenSoestLinköpingBremerhavenZürichOsnabrückBad KreuznachOldenburgTrebinjeKaiserslauternGothenburgHöhr-GrenzhausenUnnaHaguenauLüdenscheidKehlBendorfKoblenzBöselWilhelmshavenStrasbourgSchwerteMünsterFriesoytheFreiburgNeuwiedHagenDortmundCluj-NapocaDattelnMüllheimLörrachHattingenNeuenburg am RheinWuppertalBonnLingenLa SpeziaBaselSolingenGelsenkirchenLeverkusenEssenKölnSaarbrückenPejëMulhouseRatingenOberhausenMitrovicëForbachBorkenKaunasDüsseldorfEnschedeBernDuisburgDillingenGenoaBergheimTrierGlogovacWeselNišKrefeldKosovo PoljeJüchenPristinaNiederzierMönchengladbachTitzGrevenmacherJülichMontbéliardLunévilleSavonaPayerneGroningenÉpinalCairo MontenotteAostaCraiovaBaume-les-DamesBastiaPassySallanchesAlbertvilleMentonSofiaMonacoContesBotevgradNiceKristiansandCannesFréjusSevlievoGabrovoPoznańSiedlceCzechowice-DziedziceOlomoucGrajewoKrakówRoveretoGrazKętrzynChiaravalleKadaňWarsawLegionowoČaňaWłocławekFalconara MarittimaSuwałkiPilsenOlsztynPłockLęborkKościerzynaKielceKutnoTepliceJelenia GóraKrapkowiceJasłoKrosnoÚstí nad LabemEłkLitvínovBerounDěčínWschowaToruńKranjFrýdek-MístekPragueKladnoWawerŁukówLublinGdańskMostGdyniaPułtuskMladá BoleslavŚwiecieWodzisław ŚląskiBohumínKościanRigaVentspilsLiepājaBellinzonaGiubiascoTrentoCrescentinoZnojmoAnconaLuganoTurinAlessandria
14 Mar1516171819202122232425
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

LublinLublin, 14 March: 15.9 µg/m³Lublin, 15 March: 16.2 µg/m³Lublin, 16 March: 27.1 µg/m³Lublin, 17 March: 47.8 µg/m³, 2.3× its usual 20.5Lublin, 18 March: 20.1 µg/m³Lublin, 19 March: 41.8 µg/m³, 2.0× its usual 20.6Lublin, 20 March: 52.8 µg/m³, 2.6× its usual 20.6Lublin, 21 March: 30.8 µg/m³Lublin, 22 March: 32.6 µg/m³Lublin, 23 March: 20.6 µg/m³Lublin, 24 March: 26.7 µg/m³Lublin, 25 March: 17.1 µg/m³Czechowice-DziedziceCzechowice-Dziedzice, 14 March: 6.4 µg/m³Czechowice-Dziedzice, 15 March: 18.8 µg/m³Czechowice-Dziedzice, 16 March: 29.3 µg/m³Czechowice-Dziedzice, 17 March: 49.5 µg/m³, 2.0× its usual 24.3Czechowice-Dziedzice, 18 March: 48.9 µg/m³, 2.1× its usual 23.1Czechowice-Dziedzice, 19 March: 31.7 µg/m³Czechowice-Dziedzice, 20 March: 32.9 µg/m³Czechowice-Dziedzice, 21 March: 28.2 µg/m³Czechowice-Dziedzice, 22 March: no readingCzechowice-Dziedzice, 23 March: 10.6 µg/m³Czechowice-Dziedzice, 24 March: 11.3 µg/m³Czechowice-Dziedzice, 25 March: 7.6 µg/m³BohumínBohumín, 14 March: 5.2 µg/m³Bohumín, 15 March: 10.0 µg/m³Bohumín, 16 March: 21.1 µg/m³Bohumín, 17 March: 45.6 µg/m³, 2.9× its usual 16.0Bohumín, 18 March: 48.4 µg/m³, 3.0× its usual 16.0Bohumín, 19 March: 38.9 µg/m³, 2.4× its usual 16.0Bohumín, 20 March: 25.8 µg/m³Bohumín, 21 March: 17.2 µg/m³Bohumín, 22 March: 30.7 µg/m³Bohumín, 23 March: 20.4 µg/m³Bohumín, 24 March: 13.8 µg/m³Bohumín, 25 March: 5.3 µg/m³Wodzisław ŚląskiWodzisław Śląski, 14 March: 5.2 µg/m³Wodzisław Śląski, 15 March: 10.0 µg/m³Wodzisław Śląski, 16 March: 21.1 µg/m³Wodzisław Śląski, 17 March: 45.6 µg/m³, 2.9× its usual 16.0Wodzisław Śląski, 18 March: 48.4 µg/m³, 3.0× its usual 16.0Wodzisław Śląski, 19 March: 38.9 µg/m³, 2.4× its usual 16.0Wodzisław Śląski, 20 March: 25.8 µg/m³Wodzisław Śląski, 21 March: 17.2 µg/m³Wodzisław Śląski, 22 March: 30.7 µg/m³Wodzisław Śląski, 23 March: 20.4 µg/m³Wodzisław Śląski, 24 March: 13.8 µg/m³Wodzisław Śląski, 25 March: 5.3 µg/m³SiedlceSiedlce, 14 March: 12.1 µg/m³Siedlce, 15 March: 12.3 µg/m³Siedlce, 16 March: 34.8 µg/m³Siedlce, 17 March: 41.5 µg/m³, 2.0× its usual 20.7Siedlce, 18 March: 11.6 µg/m³Siedlce, 19 March: 25.2 µg/m³Siedlce, 20 March: 41.1 µg/m³, 2.1× its usual 19.5Siedlce, 21 March: 31.6 µg/m³Siedlce, 22 March: 28.6 µg/m³Siedlce, 23 March: no readingSiedlce, 24 March: no readingSiedlce, 25 March: no readingWawerWawer, 14 March: 13.4 µg/m³Wawer, 15 March: 16.8 µg/m³Wawer, 16 March: 29.2 µg/m³Wawer, 17 March: 38.9 µg/m³, 2.5× its usual 15.5Wawer, 18 March: 15.2 µg/m³Wawer, 19 March: 23.0 µg/m³Wawer, 20 March: 40.6 µg/m³, 2.6× its usual 15.4Wawer, 21 March: 19.3 µg/m³Wawer, 22 March: 29.4 µg/m³Wawer, 23 March: 19.2 µg/m³Wawer, 24 March: 10.9 µg/m³Wawer, 25 March: 8.8 µg/m³GrajewoGrajewo, 14 March: 21.9 µg/m³Grajewo, 15 March: 13.7 µg/m³Grajewo, 16 March: 31.2 µg/m³Grajewo, 17 March: 37.5 µg/m³, 2.1× its usual 17.7Grajewo, 18 March: 6.8 µg/m³Grajewo, 19 March: 28.3 µg/m³Grajewo, 20 March: 33.9 µg/m³Grajewo, 21 March: 17.2 µg/m³Grajewo, 22 March: 19.4 µg/m³Grajewo, 23 March: 22.6 µg/m³Grajewo, 24 March: 14.9 µg/m³Grajewo, 25 March: 10.6 µg/m³KrosnoKrosno, 14 March: 8.3 µg/m³Krosno, 15 March: 11.4 µg/m³Krosno, 16 March: 19.9 µg/m³Krosno, 17 March: 28.1 µg/m³, 2.1× its usual 13.2Krosno, 18 March: 10.1 µg/m³Krosno, 19 March: 11.0 µg/m³Krosno, 20 March: 32.5 µg/m³, 2.5× its usual 13.1Krosno, 21 March: no readingKrosno, 22 March: no readingKrosno, 23 March: 9.2 µg/m³Krosno, 24 March: 11.3 µg/m³Krosno, 25 March: 13.1 µg/m³Frýdek-MístekFrýdek-Místek, 14 March: 7.6 µg/m³Frýdek-Místek, 15 March: 9.1 µg/m³Frýdek-Místek, 16 March: 16.3 µg/m³Frýdek-Místek, 17 March: 15.7 µg/m³Frýdek-Místek, 18 March: 33.3 µg/m³, 2.6× its usual 12.9Frýdek-Místek, 19 March: 19.0 µg/m³Frýdek-Místek, 20 March: 27.6 µg/m³Frýdek-Místek, 21 March: 31.2 µg/m³Frýdek-Místek, 22 March: 18.1 µg/m³Frýdek-Místek, 23 March: 11.6 µg/m³Frýdek-Místek, 24 March: 12.7 µg/m³Frýdek-Místek, 25 March: 5.3 µg/m³KościanKościan, 14 March: 10.2 µg/m³Kościan, 15 March: 33.3 µg/m³Kościan, 16 March: 28.4 µg/m³Kościan, 17 March: 19.9 µg/m³Kościan, 18 March: 29.4 µg/m³Kościan, 19 March: 71.8 µg/m³, 3.0× its usual 24.0Kościan, 20 March: 49.3 µg/m³, 2.1× its usual 24.0Kościan, 21 March: 27.3 µg/m³Kościan, 22 March: 29.6 µg/m³Kościan, 23 March: 13.9 µg/m³Kościan, 24 March: no readingKościan, 25 March: no readingAlessandriaAlessandria, 14 March: no readingAlessandria, 15 March: no readingAlessandria, 16 March: no readingAlessandria, 17 March: no readingAlessandria, 18 March: no readingAlessandria, 19 March: 53.5 µg/m³, 5.0× its usual 10.7Alessandria, 20 March: no readingAlessandria, 21 March: 37.0 µg/m³, 3.4× its usual 10.8Alessandria, 22 March: 26.6 µg/m³, 2.4× its usual 11.1Alessandria, 23 March: no readingAlessandria, 24 March: 10.3 µg/m³Alessandria, 25 March: 10.2 µg/m³ToruńToruń, 14 March: 10.3 µg/m³Toruń, 15 March: 11.8 µg/m³Toruń, 16 March: 25.3 µg/m³Toruń, 17 March: 29.9 µg/m³Toruń, 18 March: 26.1 µg/m³Toruń, 19 March: 48.8 µg/m³, 2.5× its usual 19.4Toruń, 20 March: 45.6 µg/m³, 2.4× its usual 19.2Toruń, 21 March: 14.2 µg/m³Toruń, 22 March: 29.8 µg/m³Toruń, 23 March: 16.0 µg/m³Toruń, 24 March: 14.3 µg/m³Toruń, 25 March: 10.1 µg/m³ŁukówŁuków, 14 March: 11.8 µg/m³Łuków, 15 March: 14.9 µg/m³Łuków, 16 March: 16.8 µg/m³Łuków, 17 March: 29.6 µg/m³Łuków, 18 March: 16.4 µg/m³Łuków, 19 March: 36.1 µg/m³, 2.0× its usual 18.0Łuków, 20 March: 47.5 µg/m³, 2.6× its usual 18.4Łuków, 21 March: 18.1 µg/m³Łuków, 22 March: 24.6 µg/m³Łuków, 23 March: 19.8 µg/m³Łuków, 24 March: 18.5 µg/m³Łuków, 25 March: 14.4 µg/m³WschowaWschowa, 14 March: no readingWschowa, 15 March: no readingWschowa, 16 March: no readingWschowa, 17 March: no readingWschowa, 18 March: no readingWschowa, 19 March: 46.2 µg/m³, 2.5× its usual 18.8Wschowa, 20 March: no readingWschowa, 21 March: 23.0 µg/m³Wschowa, 22 March: 20.5 µg/m³Wschowa, 23 March: no readingWschowa, 24 March: 8.3 µg/m³Wschowa, 25 March: 5.5 µg/m³ZnojmoZnojmo, 14 March: 10.1 µg/m³Znojmo, 15 March: 4.7 µg/m³Znojmo, 16 March: 9.2 µg/m³Znojmo, 17 March: 11.3 µg/m³Znojmo, 18 March: 13.0 µg/m³Znojmo, 19 March: 45.9 µg/m³, 3.5× its usual 13.0Znojmo, 20 March: 20.5 µg/m³Znojmo, 21 March: no readingZnojmo, 22 March: 28.2 µg/m³Znojmo, 23 March: 12.1 µg/m³Znojmo, 24 March: 18.2 µg/m³Znojmo, 25 March: 5.9 µg/m³ŚwiecieŚwiecie, 14 March: 7.1 µg/m³Świecie, 15 March: 10.1 µg/m³Świecie, 16 March: 15.6 µg/m³Świecie, 17 March: 24.4 µg/m³Świecie, 18 March: 24.3 µg/m³Świecie, 19 March: 45.8 µg/m³, 3.0× its usual 15.1Świecie, 20 March: 30.1 µg/m³Świecie, 21 March: 13.8 µg/m³Świecie, 22 March: 25.7 µg/m³Świecie, 23 March: 12.2 µg/m³Świecie, 24 March: 11.1 µg/m³Świecie, 25 March: 9.4 µg/m³ČaňaČaňa, 14 March: no readingČaňa, 15 March: no readingČaňa, 16 March: no readingČaňa, 17 March: no readingČaňa, 18 March: no readingČaňa, 19 March: 45.8 µg/m³, 2.2× its usual 21.0Čaňa, 20 March: no readingČaňa, 21 March: 31.0 µg/m³Čaňa, 22 March: 20.7 µg/m³Čaňa, 23 March: no readingČaňa, 24 March: 24.6 µg/m³Čaňa, 25 March: 19.4 µg/m³PułtuskPułtusk, 14 March: 10.5 µg/m³Pułtusk, 15 March: 9.8 µg/m³Pułtusk, 16 March: 24.1 µg/m³Pułtusk, 17 March: 28.9 µg/m³Pułtusk, 18 March: 12.0 µg/m³Pułtusk, 19 March: 42.3 µg/m³, 2.7× its usual 15.4Pułtusk, 20 March: 45.1 µg/m³, 2.9× its usual 15.3Pułtusk, 21 March: 22.4 µg/m³Pułtusk, 22 March: 28.5 µg/m³Pułtusk, 23 March: 16.3 µg/m³Pułtusk, 24 March: 12.0 µg/m³Pułtusk, 25 March: 11.5 µg/m³MostMost, 14 March: 2.9 µg/m³Most, 15 March: 4.9 µg/m³Most, 16 March: 8.5 µg/m³Most, 17 March: 14.1 µg/m³Most, 18 March: 17.6 µg/m³Most, 19 March: 43.8 µg/m³, 2.8× its usual 15.9Most, 20 March: 26.2 µg/m³Most, 21 March: 10.7 µg/m³Most, 22 March: 11.1 µg/m³Most, 23 March: 7.6 µg/m³Most, 24 March: no readingMost, 25 March: 4.0 µg/m³Jelenia GóraJelenia Góra, 14 March: 5.2 µg/m³Jelenia Góra, 15 March: 9.8 µg/m³Jelenia Góra, 16 March: 21.6 µg/m³Jelenia Góra, 17 March: 14.1 µg/m³Jelenia Góra, 18 March: 20.7 µg/m³Jelenia Góra, 19 March: 43.5 µg/m³, 2.4× its usual 18.0Jelenia Góra, 20 March: 34.4 µg/m³Jelenia Góra, 21 March: 28.5 µg/m³Jelenia Góra, 22 March: 20.7 µg/m³Jelenia Góra, 23 March: 8.7 µg/m³Jelenia Góra, 24 March: 6.7 µg/m³Jelenia Góra, 25 March: 4.6 µg/m³GdyniaGdynia, 14 March: 9.9 µg/m³Gdynia, 15 March: 7.7 µg/m³Gdynia, 16 March: 11.4 µg/m³Gdynia, 17 March: 23.2 µg/m³Gdynia, 18 March: 25.9 µg/m³Gdynia, 19 March: 42.3 µg/m³, 2.9× its usual 14.4Gdynia, 20 March: 23.6 µg/m³Gdynia, 21 March: 14.1 µg/m³Gdynia, 22 March: 20.6 µg/m³Gdynia, 23 March: 11.9 µg/m³Gdynia, 24 March: 10.9 µg/m³Gdynia, 25 March: 11.1 µg/m³KościerzynaKościerzyna, 14 March: 10.0 µg/m³Kościerzyna, 15 March: 12.0 µg/m³Kościerzyna, 16 March: 29.7 µg/m³Kościerzyna, 17 March: 15.2 µg/m³Kościerzyna, 18 March: 27.5 µg/m³Kościerzyna, 19 March: 41.2 µg/m³, 2.3× its usual 17.6Kościerzyna, 20 March: 23.5 µg/m³Kościerzyna, 21 March: 8.0 µg/m³Kościerzyna, 22 March: 19.5 µg/m³Kościerzyna, 23 March: 11.7 µg/m³Kościerzyna, 24 March: 14.0 µg/m³Kościerzyna, 25 March: 12.8 µg/m³DěčínDěčín, 14 March: 9.9 µg/m³Děčín, 15 March: 10.7 µg/m³Děčín, 16 March: 19.3 µg/m³Děčín, 17 March: 10.8 µg/m³Děčín, 18 March: 17.1 µg/m³Děčín, 19 March: 41.1 µg/m³, 2.5× its usual 16.6Děčín, 20 March: 39.5 µg/m³, 2.3× its usual 17.0Děčín, 21 March: no readingDěčín, 22 March: 19.7 µg/m³Děčín, 23 March: 23.3 µg/m³Děčín, 24 March: 13.6 µg/m³Děčín, 25 March: 9.8 µg/m³PoznańPoznań, 14 March: 4.7 µg/m³Poznań, 15 March: 8.0 µg/m³Poznań, 16 March: 9.0 µg/m³Poznań, 17 March: 19.9 µg/m³Poznań, 18 March: 22.3 µg/m³Poznań, 19 March: 39.6 µg/m³, 2.0× its usual 19.5Poznań, 20 March: 37.9 µg/m³Poznań, 21 March: 17.4 µg/m³Poznań, 22 March: 19.9 µg/m³Poznań, 23 March: 13.8 µg/m³Poznań, 24 March: 7.3 µg/m³Poznań, 25 March: 5.2 µg/m³GdańskGdańsk, 14 March: 8.5 µg/m³Gdańsk, 15 March: 8.7 µg/m³Gdańsk, 16 March: 11.7 µg/m³Gdańsk, 17 March: 22.7 µg/m³Gdańsk, 18 March: 25.3 µg/m³Gdańsk, 19 March: 39.5 µg/m³, 2.7× its usual 14.9Gdańsk, 20 March: 25.6 µg/m³Gdańsk, 21 March: 12.0 µg/m³Gdańsk, 22 March: 20.2 µg/m³Gdańsk, 23 March: 10.9 µg/m³Gdańsk, 24 March: 11.1 µg/m³Gdańsk, 25 March: 9.2 µg/m³BerounBeroun, 14 March: 4.8 µg/m³Beroun, 15 March: 8.0 µg/m³Beroun, 16 March: 12.9 µg/m³Beroun, 17 March: 17.2 µg/m³Beroun, 18 March: 21.3 µg/m³Beroun, 19 March: 39.0 µg/m³, 2.5× its usual 15.9Beroun, 20 March: 22.7 µg/m³Beroun, 21 March: 12.4 µg/m³Beroun, 22 March: 13.4 µg/m³Beroun, 23 March: 17.2 µg/m³Beroun, 24 March: 13.4 µg/m³Beroun, 25 March: no readingLęborkLębork, 14 March: 6.2 µg/m³Lębork, 15 March: 16.7 µg/m³Lębork, 16 March: 22.4 µg/m³Lębork, 17 March: 19.3 µg/m³Lębork, 18 March: 29.0 µg/m³Lębork, 19 March: 39.0 µg/m³, 2.3× its usual 17.3Lębork, 20 March: 29.4 µg/m³Lębork, 21 March: 14.7 µg/m³Lębork, 22 March: 17.2 µg/m³Lębork, 23 March: 12.0 µg/m³Lębork, 24 March: 14.9 µg/m³Lębork, 25 March: 12.5 µg/m³KladnoKladno, 14 March: 2.0 µg/m³Kladno, 15 March: 7.4 µg/m³Kladno, 16 March: 9.5 µg/m³Kladno, 17 March: 12.2 µg/m³Kladno, 18 March: 18.2 µg/m³Kladno, 19 March: 38.5 µg/m³, 2.6× its usual 14.7Kladno, 20 March: 15.9 µg/m³Kladno, 21 March: 9.0 µg/m³Kladno, 22 March: 8.2 µg/m³Kladno, 23 March: 6.6 µg/m³Kladno, 24 March: no readingKladno, 25 March: no readingLitvínovLitvínov, 14 March: 2.8 µg/m³Litvínov, 15 March: 5.5 µg/m³Litvínov, 16 March: 12.7 µg/m³Litvínov, 17 March: 14.2 µg/m³Litvínov, 18 March: 17.6 µg/m³Litvínov, 19 March: 38.2 µg/m³, 2.5× its usual 15.2Litvínov, 20 March: 25.2 µg/m³Litvínov, 21 March: no readingLitvínov, 22 March: 11.0 µg/m³Litvínov, 23 March: 6.0 µg/m³Litvínov, 24 March: 7.2 µg/m³Litvínov, 25 March: no readingMladá BoleslavMladá Boleslav, 14 March: 7.9 µg/m³Mladá Boleslav, 15 March: 7.5 µg/m³Mladá Boleslav, 16 March: 12.4 µg/m³Mladá Boleslav, 17 March: 11.2 µg/m³Mladá Boleslav, 18 March: 14.3 µg/m³Mladá Boleslav, 19 March: 27.2 µg/m³, 2.2× its usual 12.5Mladá Boleslav, 20 March: 37.8 µg/m³, 3.0× its usual 12.7Mladá Boleslav, 21 March: 12.7 µg/m³Mladá Boleslav, 22 March: 17.2 µg/m³Mladá Boleslav, 23 March: 13.6 µg/m³Mladá Boleslav, 24 March: 6.9 µg/m³Mladá Boleslav, 25 March: 4.3 µg/m³PraguePrague, 14 March: 3.9 µg/m³Prague, 15 March: 5.5 µg/m³Prague, 16 March: 9.0 µg/m³Prague, 17 March: 12.1 µg/m³Prague, 18 March: 17.2 µg/m³Prague, 19 March: 36.7 µg/m³, 2.6× its usual 14.1Prague, 20 March: 21.0 µg/m³Prague, 21 March: 12.7 µg/m³Prague, 22 March: 9.5 µg/m³Prague, 23 March: 8.9 µg/m³Prague, 24 March: 5.3 µg/m³Prague, 25 March: no readingEłkEłk, 14 March: 13.3 µg/m³Ełk, 15 March: 8.7 µg/m³Ełk, 16 March: 16.0 µg/m³Ełk, 17 March: 29.9 µg/m³Ełk, 18 March: 9.0 µg/m³Ełk, 19 March: 33.1 µg/m³, 2.2× its usual 15.0Ełk, 20 March: 36.3 µg/m³, 2.5× its usual 14.4Ełk, 21 March: 10.6 µg/m³Ełk, 22 March: 20.3 µg/m³Ełk, 23 March: 18.0 µg/m³Ełk, 24 March: 10.7 µg/m³Ełk, 25 March: 8.9 µg/m³Ústí nad LabemÚstí nad Labem, 14 March: 4.3 µg/m³Ústí nad Labem, 15 March: 5.8 µg/m³Ústí nad Labem, 16 March: 13.6 µg/m³Ústí nad Labem, 17 March: 14.7 µg/m³Ústí nad Labem, 18 March: 17.2 µg/m³Ústí nad Labem, 19 March: 34.3 µg/m³, 2.5× its usual 13.6Ústí nad Labem, 20 March: 31.7 µg/m³, 2.3× its usual 13.6Ústí nad Labem, 21 March: 9.2 µg/m³Ústí nad Labem, 22 March: 12.5 µg/m³Ústí nad Labem, 23 March: 8.0 µg/m³Ústí nad Labem, 24 March: 8.6 µg/m³Ústí nad Labem, 25 March: no readingTrentoTrento, 14 March: no readingTrento, 15 March: no readingTrento, 16 March: no readingTrento, 17 March: no readingTrento, 18 March: no readingTrento, 19 March: 29.7 µg/m³, 3.1× its usual 9.6Trento, 20 March: no readingTrento, 21 March: 31.5 µg/m³, 3.2× its usual 10.0Trento, 22 March: 30.2 µg/m³, 2.9× its usual 10.5Trento, 23 March: no readingTrento, 24 March: 22.7 µg/m³Trento, 25 March: 6.4 µg/m³PilsenPilsen, 14 March: 2.9 µg/m³Pilsen, 15 March: 6.3 µg/m³Pilsen, 16 March: 12.6 µg/m³Pilsen, 17 March: 11.1 µg/m³Pilsen, 18 March: 19.0 µg/m³Pilsen, 19 March: 31.4 µg/m³, 2.3× its usual 13.4Pilsen, 20 March: 14.5 µg/m³Pilsen, 21 March: 11.2 µg/m³Pilsen, 22 March: 11.8 µg/m³Pilsen, 23 March: 10.4 µg/m³Pilsen, 24 March: 4.9 µg/m³Pilsen, 25 March: 4.1 µg/m³KadaňKadaň, 14 March: 2.9 µg/m³Kadaň, 15 March: 6.6 µg/m³Kadaň, 16 March: 9.2 µg/m³Kadaň, 17 March: 18.0 µg/m³Kadaň, 18 March: 25.4 µg/m³Kadaň, 19 March: 31.1 µg/m³, 2.2× its usual 14.4Kadaň, 20 March: 10.3 µg/m³Kadaň, 21 March: 9.3 µg/m³Kadaň, 22 March: 7.2 µg/m³Kadaň, 23 March: 9.0 µg/m³Kadaň, 24 March: no readingKadaň, 25 March: 3.6 µg/m³SuwałkiSuwałki, 14 March: 13.7 µg/m³Suwałki, 15 March: 8.3 µg/m³Suwałki, 16 March: 16.4 µg/m³Suwałki, 17 March: 14.7 µg/m³Suwałki, 18 March: 8.5 µg/m³Suwałki, 19 March: 30.2 µg/m³, 2.3× its usual 13.3Suwałki, 20 March: 28.1 µg/m³, 2.1× its usual 13.3Suwałki, 21 March: 7.5 µg/m³Suwałki, 22 March: 18.9 µg/m³Suwałki, 23 March: 16.1 µg/m³Suwałki, 24 March: 10.3 µg/m³Suwałki, 25 March: 8.6 µg/m³KętrzynKętrzyn, 14 March: 13.9 µg/m³Kętrzyn, 15 March: 11.2 µg/m³Kętrzyn, 16 March: 14.8 µg/m³Kętrzyn, 17 March: 19.3 µg/m³Kętrzyn, 18 March: 10.9 µg/m³Kętrzyn, 19 March: 30.0 µg/m³, 2.2× its usual 13.5Kętrzyn, 20 March: 29.5 µg/m³, 2.2× its usual 13.7Kętrzyn, 21 March: 14.6 µg/m³Kętrzyn, 22 March: 24.0 µg/m³Kętrzyn, 23 March: 18.0 µg/m³Kętrzyn, 24 March: 10.2 µg/m³Kętrzyn, 25 March: 11.5 µg/m³GiubiascoGiubiasco, 14 March: no readingGiubiasco, 15 March: no readingGiubiasco, 16 March: no readingGiubiasco, 17 March: no readingGiubiasco, 18 March: no readingGiubiasco, 19 March: 27.5 µg/m³, 3.2× its usual 8.5Giubiasco, 20 March: no readingGiubiasco, 21 March: 24.4 µg/m³Giubiasco, 22 March: 25.3 µg/m³, 2.6× its usual 9.7Giubiasco, 23 March: no readingGiubiasco, 24 March: 12.4 µg/m³Giubiasco, 25 March: 6.8 µg/m³WłocławekWłocławek, 14 March: 16.6 µg/m³Włocławek, 15 March: 24.0 µg/m³Włocławek, 16 March: 55.8 µg/m³Włocławek, 17 March: 35.5 µg/m³Włocławek, 18 March: 29.1 µg/m³Włocławek, 19 March: 42.5 µg/m³Włocławek, 20 March: 55.2 µg/m³, 2.2× its usual 25.3Włocławek, 21 March: 22.7 µg/m³Włocławek, 22 March: 36.3 µg/m³Włocławek, 23 March: 26.5 µg/m³Włocławek, 24 March: 14.9 µg/m³Włocławek, 25 March: 14.4 µg/m³KutnoKutno, 14 March: 10.1 µg/m³Kutno, 15 March: 15.8 µg/m³Kutno, 16 March: 31.8 µg/m³Kutno, 17 March: 30.0 µg/m³Kutno, 18 March: 22.1 µg/m³Kutno, 19 March: 37.6 µg/m³Kutno, 20 March: 49.0 µg/m³, 2.3× its usual 20.9Kutno, 21 March: 28.3 µg/m³Kutno, 22 March: 37.0 µg/m³Kutno, 23 March: 14.4 µg/m³Kutno, 24 March: 10.3 µg/m³Kutno, 25 March: 11.1 µg/m³KielceKielce, 14 March: 11.9 µg/m³Kielce, 15 March: 20.1 µg/m³Kielce, 16 March: 29.6 µg/m³Kielce, 17 March: 30.9 µg/m³Kielce, 18 March: 16.0 µg/m³Kielce, 19 March: no readingKielce, 20 March: 46.3 µg/m³, 2.3× its usual 20.0Kielce, 21 March: no readingKielce, 22 March: no readingKielce, 23 March: 21.7 µg/m³Kielce, 24 March: no readingKielce, 25 March: no readingKrakówKraków, 14 March: 10.1 µg/m³Kraków, 15 March: 10.9 µg/m³Kraków, 16 March: 22.6 µg/m³Kraków, 17 March: 36.4 µg/m³Kraków, 18 March: 29.3 µg/m³Kraków, 19 March: 44.2 µg/m³Kraków, 20 March: 46.3 µg/m³, 2.1× its usual 22.3Kraków, 21 March: 28.0 µg/m³Kraków, 22 March: 31.8 µg/m³Kraków, 23 March: 22.2 µg/m³Kraków, 24 March: 15.6 µg/m³Kraków, 25 March: 9.5 µg/m³LiepājaLiepāja, 14 March: 16.0 µg/m³Liepāja, 15 March: 9.5 µg/m³Liepāja, 16 March: 22.7 µg/m³Liepāja, 17 March: 21.5 µg/m³Liepāja, 18 March: 13.1 µg/m³Liepāja, 19 March: no readingLiepāja, 20 March: 43.9 µg/m³, 3.1× its usual 14.3Liepāja, 21 March: no readingLiepāja, 22 March: no readingLiepāja, 23 March: 21.5 µg/m³Liepāja, 24 March: no readingLiepāja, 25 March: no readingLegionowoLegionowo, 14 March: 13.1 µg/m³Legionowo, 15 March: 19.0 µg/m³Legionowo, 16 March: 32.9 µg/m³Legionowo, 17 March: 37.5 µg/m³Legionowo, 18 March: 13.1 µg/m³Legionowo, 19 March: no readingLegionowo, 20 March: 42.8 µg/m³, 2.2× its usual 19.8Legionowo, 21 March: no readingLegionowo, 22 March: no readingLegionowo, 23 March: 18.8 µg/m³Legionowo, 24 March: no readingLegionowo, 25 March: no readingWarsawWarsaw, 14 March: 12.0 µg/m³Warsaw, 15 March: 12.7 µg/m³Warsaw, 16 March: 20.8 µg/m³Warsaw, 17 March: 27.0 µg/m³Warsaw, 18 March: 13.0 µg/m³Warsaw, 19 March: 26.7 µg/m³Warsaw, 20 March: 39.1 µg/m³, 2.2× its usual 18.0Warsaw, 21 March: 16.4 µg/m³Warsaw, 22 March: 25.8 µg/m³Warsaw, 23 March: 18.7 µg/m³Warsaw, 24 March: 13.4 µg/m³Warsaw, 25 March: 10.3 µg/m³PłockPłock, 14 March: 9.8 µg/m³Płock, 15 March: 10.1 µg/m³Płock, 16 March: 16.8 µg/m³Płock, 17 March: 26.1 µg/m³Płock, 18 March: 16.4 µg/m³Płock, 19 March: 25.8 µg/m³Płock, 20 March: 36.6 µg/m³, 2.3× its usual 16.1Płock, 21 March: 13.8 µg/m³Płock, 22 March: 33.3 µg/m³Płock, 23 March: 14.5 µg/m³Płock, 24 March: 11.9 µg/m³Płock, 25 March: 9.8 µg/m³TepliceTeplice, 14 March: 6.1 µg/m³Teplice, 15 March: 5.9 µg/m³Teplice, 16 March: 10.1 µg/m³Teplice, 17 March: 11.6 µg/m³Teplice, 18 March: 15.8 µg/m³Teplice, 19 March: no readingTeplice, 20 March: 33.3 µg/m³, 2.4× its usual 13.7Teplice, 21 March: no readingTeplice, 22 March: no readingTeplice, 23 March: 11.2 µg/m³Teplice, 24 March: no readingTeplice, 25 March: no readingVentspilsVentspils, 14 March: 8.7 µg/m³Ventspils, 15 March: 4.8 µg/m³Ventspils, 16 March: 14.2 µg/m³Ventspils, 17 March: 14.4 µg/m³Ventspils, 18 March: 8.7 µg/m³Ventspils, 19 March: 21.3 µg/m³Ventspils, 20 March: 32.1 µg/m³, 3.1× its usual 10.4Ventspils, 21 March: 3.6 µg/m³Ventspils, 22 March: 10.3 µg/m³Ventspils, 23 March: 9.7 µg/m³Ventspils, 24 March: 6.9 µg/m³Ventspils, 25 March: 9.8 µg/m³OlsztynOlsztyn, 14 March: 11.5 µg/m³Olsztyn, 15 March: 8.4 µg/m³Olsztyn, 16 March: 14.3 µg/m³Olsztyn, 17 March: 18.7 µg/m³Olsztyn, 18 March: 11.4 µg/m³Olsztyn, 19 March: 24.5 µg/m³Olsztyn, 20 March: 32.1 µg/m³, 2.3× its usual 14.2Olsztyn, 21 March: 10.6 µg/m³Olsztyn, 22 March: 25.9 µg/m³Olsztyn, 23 March: 18.0 µg/m³Olsztyn, 24 March: 8.1 µg/m³Olsztyn, 25 March: 9.9 µg/m³JasłoJasło, 14 March: 8.9 µg/m³Jasło, 15 March: 9.9 µg/m³Jasło, 16 March: 20.2 µg/m³Jasło, 17 March: 25.5 µg/m³Jasło, 18 March: 10.8 µg/m³Jasło, 19 March: 14.6 µg/m³Jasło, 20 March: 30.9 µg/m³, 2.5× its usual 12.5Jasło, 21 March: 23.3 µg/m³Jasło, 22 March: 13.1 µg/m³Jasło, 23 March: 9.3 µg/m³Jasło, 24 March: 11.9 µg/m³Jasło, 25 March: 11.0 µg/m³RigaRiga, 14 March: 13.2 µg/m³Riga, 15 March: 7.4 µg/m³Riga, 16 March: 9.1 µg/m³Riga, 17 March: 10.1 µg/m³Riga, 18 March: 6.7 µg/m³Riga, 19 March: 21.2 µg/m³Riga, 20 March: 30.5 µg/m³, 3.1× its usual 9.9Riga, 21 March: 6.4 µg/m³Riga, 22 March: 10.0 µg/m³Riga, 23 March: 13.9 µg/m³Riga, 24 March: 6.9 µg/m³Riga, 25 March: 7.2 µg/m³OlomoucOlomouc, 14 March: 8.1 µg/m³Olomouc, 15 March: 5.9 µg/m³Olomouc, 16 March: 12.2 µg/m³Olomouc, 17 March: 17.1 µg/m³Olomouc, 18 March: 18.0 µg/m³Olomouc, 19 March: 24.8 µg/m³Olomouc, 20 March: 30.5 µg/m³, 2.1× its usual 14.5Olomouc, 21 March: 17.3 µg/m³Olomouc, 22 March: 20.4 µg/m³Olomouc, 23 March: 14.3 µg/m³Olomouc, 24 March: 15.3 µg/m³Olomouc, 25 March: 5.0 µg/m³KranjKranj, 14 March: 11.3 µg/m³Kranj, 15 March: 6.5 µg/m³Kranj, 16 March: 12.7 µg/m³Kranj, 17 March: 20.6 µg/m³Kranj, 18 March: 19.7 µg/m³Kranj, 19 March: no readingKranj, 20 March: 27.8 µg/m³, 2.6× its usual 10.9Kranj, 21 March: no readingKranj, 22 March: no readingKranj, 23 March: 21.4 µg/m³Kranj, 24 March: no readingKranj, 25 March: no readingGrazGraz, 14 March: 9.2 µg/m³Graz, 15 March: 5.6 µg/m³Graz, 16 March: 9.8 µg/m³Graz, 17 March: 15.5 µg/m³Graz, 18 March: 20.1 µg/m³Graz, 19 March: 24.6 µg/m³Graz, 20 March: 27.7 µg/m³, 2.2× its usual 12.6Graz, 21 March: 8.9 µg/m³Graz, 22 March: 10.7 µg/m³Graz, 23 March: 22.6 µg/m³Graz, 24 March: 19.4 µg/m³Graz, 25 March: 5.2 µg/m³TurinTurin, 14 March: 9.7 µg/m³Turin, 15 March: 5.0 µg/m³Turin, 16 March: 12.1 µg/m³Turin, 17 March: 17.0 µg/m³Turin, 18 March: 25.5 µg/m³Turin, 19 March: 16.5 µg/m³Turin, 20 March: no readingTurin, 21 March: 43.5 µg/m³, 4.1× its usual 10.7Turin, 22 March: no readingTurin, 23 March: 23.2 µg/m³Turin, 24 March: 13.8 µg/m³Turin, 25 March: 10.4 µg/m³CrescentinoCrescentino, 14 March: no readingCrescentino, 15 March: no readingCrescentino, 16 March: no readingCrescentino, 17 March: no readingCrescentino, 18 March: no readingCrescentino, 19 March: 19.3 µg/m³Crescentino, 20 March: no readingCrescentino, 21 March: 38.3 µg/m³, 3.4× its usual 11.4Crescentino, 22 March: 39.8 µg/m³, 3.3× its usual 12.1Crescentino, 23 March: no readingCrescentino, 24 March: 16.3 µg/m³Crescentino, 25 March: 9.8 µg/m³AnconaAncona, 14 March: 9.2 µg/m³Ancona, 15 March: 7.2 µg/m³Ancona, 16 March: 3.6 µg/m³Ancona, 17 March: 6.2 µg/m³Ancona, 18 March: 9.7 µg/m³Ancona, 19 March: 11.6 µg/m³Ancona, 20 March: 15.4 µg/m³Ancona, 21 March: 36.7 µg/m³, 3.9× its usual 9.4Ancona, 22 March: no readingAncona, 23 March: 16.5 µg/m³Ancona, 24 March: 10.6 µg/m³Ancona, 25 March: 5.2 µg/m³LuganoLugano, 14 March: no readingLugano, 15 March: no readingLugano, 16 March: no readingLugano, 17 March: no readingLugano, 18 March: no readingLugano, 19 March: 21.8 µg/m³Lugano, 20 March: no readingLugano, 21 March: 33.3 µg/m³, 4.0× its usual 8.3Lugano, 22 March: 25.5 µg/m³, 3.0× its usual 8.5Lugano, 23 March: no readingLugano, 24 March: 12.8 µg/m³Lugano, 25 March: 8.3 µg/m³ChiaravalleChiaravalle, 14 March: no readingChiaravalle, 15 March: no readingChiaravalle, 16 March: no readingChiaravalle, 17 March: no readingChiaravalle, 18 March: no readingChiaravalle, 19 March: 18.1 µg/m³Chiaravalle, 20 March: no readingChiaravalle, 21 March: 30.3 µg/m³, 2.2× its usual 13.5Chiaravalle, 22 March: 26.8 µg/m³Chiaravalle, 23 March: no readingChiaravalle, 24 March: 12.5 µg/m³Chiaravalle, 25 March: 9.8 µg/m³14 Mar1618202224
The 60 cities with the highest readings of 64, 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
AlessandriaPiedmont, Italy3 53.519 March10.75.0×
TurinPiedmont, Italy1 43.521 March10.74.1×
LuganoTicino, Switzerland2 33.321 March8.34.0×
AnconaThe Marches, Italy1 36.721 March9.43.9×
ZnojmoSouth Moravian, Czechia1 45.919 March13.03.5×
CrescentinoPiedmont, Italy2 39.822 March12.13.3×
TrentoTrentino-Alto Adige, Italy3 31.521 March10.03.2×
GiubiascoTicino, Switzerland2 27.519 March8.53.2×
BellinzonaTicino, Switzerland2 27.519 March8.53.2×
LiepājaLiepaja, Latvia1 43.920 March14.33.1×
VentspilsVentspils, Latvia1 32.120 March10.43.1×
RigaRiga, Latvia1 30.520 March9.93.1×
KościanGreater Poland, Poland2 71.819 March24.03.0×
BohumínMoravian-Silesian Region, Czechia3 48.418 March16.03.0×
Wodzisław ŚląskiSilesia, Poland3 48.418 March16.03.0×
ŚwiecieKujawsko-Pomorskie, Poland1 45.819 March15.13.0×
Mladá BoleslavCentral Bohemia, Czechia2 37.820 March12.73.0×
PułtuskMazovia, Poland2 45.120 March15.32.9×
GdyniaPomerania, Poland1 42.319 March14.42.9×
MostÚstí nad Labem Region, Czechia1 43.819 March15.92.8×
GdańskPomerania, Poland1 39.519 March14.92.7×
LublinLublin, Poland3 52.820 March20.62.6×
ŁukówLublin, Poland2 47.520 March18.42.6×
WawerMazovia, Poland2 40.620 March15.42.6×
KladnoCentral Bohemia, Czechia1 38.519 March14.72.6×
PraguePrague, Czechia1 36.719 March14.12.6×
Frýdek-MístekMoravian-Silesian Region, Czechia1 33.318 March12.92.6×
KranjUrban Municipality of Kranj, Slovenia1 27.820 March10.92.6×
ToruńKujawsko-Pomorskie, Poland2 48.819 March19.42.5×
WschowaLubusz, Poland1 46.219 March18.82.5×
DěčínÚstí nad Labem Region, Czechia2 41.119 March16.62.5×
BerounCentral Bohemia, Czechia1 39.019 March15.92.5×
LitvínovÚstí nad Labem Region, Czechia1 38.219 March15.22.5×
EłkWarmia-Masuria, Poland2 36.320 March14.42.5×
Ústí nad LabemÚstí nad Labem Region, Czechia2 34.319 March13.62.5×
KrosnoSubcarpathia, Poland2 32.520 March13.12.5×
JasłoSubcarpathia, Poland1 30.920 March12.52.5×
KrapkowiceOpole Voivodeship, Poland1 26.519 March10.62.5×
Jelenia GóraLower Silesia, Poland1 43.519 March18.02.4×
TepliceÚstí nad Labem Region, Czechia1 33.320 March13.72.4×
KutnoŁódź Voivodeship, Poland1 49.020 March20.92.3×
KielceŚwiętokrzyskie, Poland1 46.320 March20.02.3×
KościerzynaPomerania, Poland1 41.219 March17.62.3×
LęborkPomerania, Poland1 39.019 March17.32.3×
PłockMazovia, Poland1 36.620 March16.12.3×
OlsztynWarmia-Masuria, Poland1 32.120 March14.22.3×
PilsenPlzeň Region, Czechia1 31.419 March13.42.3×
SuwałkiPodlasie, Poland2 30.219 March13.32.3×
Falconara MarittimaThe Marches, Italy1 26.421 March11.52.3×
WłocławekKujawsko-Pomorskie, Poland1 55.220 March25.32.2×
ČaňaKošice Region, Slovakia1 45.819 March21.02.2×
LegionowoMazovia, Poland1 42.820 March19.82.2×
WarsawMazovia, Poland1 39.120 March18.02.2×
KadaňÚstí nad Labem Region, Czechia1 31.119 March14.42.2×
ChiaravalleThe Marches, Italy1 30.321 March13.52.2×
KętrzynWarmia-Masuria, Poland2 30.019 March13.52.2×
GrazStyria, Austria1 27.720 March12.62.2×
RoveretoTrentino-Alto Adige, Italy3 25.922 March11.62.2×
KrakówLesser Poland, Poland1 46.320 March22.32.1×
GrajewoPodlasie, Poland1 37.517 March17.72.1×
OlomoucOlomouc Region, Czechia1 30.520 March14.52.1×
Czechowice-DziedziceSilesia, Poland2 49.517 March24.32.0×
SiedlceMazovia, Poland2 41.517 March20.72.0×
PoznańGreater Poland, Poland1 39.619 March19.52.0×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in Poland and Czechia

Number 8 of 46 episodes in Poland and Czechia since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 46.

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SmogRank, Europe, 17 to 22 March 2023: 64 cities with PM2.5 at twice their usual or more, 17 to 22 March 2023, smogrank.com/episodes/2023-03-17-europe (accessed 5 October 2026).

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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.