Europe, February and March 2024
For 12 days, from 28 February to 10 March 2024, 264 cities in Germany, Poland, Czechia and 12 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Otwock, Mazovia, Poland: 90.3 µg/m³ on 8 March, about 3.1× its usual 29.4.
Day by day
How it spread
Every city it reached
| City | Days | Highest | Above usual |
|---|---|---|---|
| BirminghamEngland, United Kingdom | 1 | 39.09 March | 5.7× |
| GoslarLower Saxony, Germany | 3 | 34.15 March | 5.7× |
| Dún LaoghaireLeinster, Ireland | 2 | 40.89 March | 5.5× |
| DublinLeinster, Ireland | 2 | 36.29 March | 5.4× |
| MalmöSkåne, Sweden | 3 | 45.22 March | 5.1× |
| StralsundMecklenburg-Vorpommern, Germany | 5 | 51.82 March | 4.7× |
| CorkMunster, Ireland | 2 | 29.98 March | 4.6× |
| DelmenhorstLower Saxony, Germany | 2 | 40.54 March | 4.5× |
| FlensburgSchleswig-Holstein, Germany | 2 | 39.63 March | 4.5× |
| KielSchleswig-Holstein, Germany | 3 | 37.53 March | 4.5× |
| CanterburyEngland, United Kingdom | 1 | 26.87 March | 4.5× |
| WilhelmshavenLower Saxony, Germany | 2 | 37.64 March | 4.3× |
| Canvey IslandEngland, United Kingdom | 1 | 26.57 March | 4.3× |
| LiverpoolEngland, United Kingdom | 1 | 25.87 March | 4.3× |
| KoksijdeFlanders, Belgium | 1 | 32.67 March | 4.2× |
| TournaiWallonia, Belgium | 1 | 28.07 March | 4.2× |
| NorrköpingÖstergötland, Sweden | 2 | 26.32 March | 4.2× |
| RostockMecklenburg-Vorpommern, Germany | 6 | 44.63 March | 4.1× |
| SheffieldEngland, United Kingdom | 1 | 25.27 March | 4.1× |
| AarschotFlanders, Belgium | 1 | 32.17 March | 4.0× |
| GüstrowMecklenburg-Vorpommern, Germany | 5 | 39.93 March | 3.9× |
| BremerhavenBremen, Germany | 3 | 37.34 March | 3.9× |
| ItzehoeSchleswig-Holstein, Germany | 3 | 35.54 March | 3.9× |
| HerrenbergBaden-Wurttemberg, Germany | 1 | 28.17 March | 3.9× |
| WitzenhausenHesse, Germany | 1 | 26.58 March | 3.9× |
| SiedlceMazovia, Poland | 3 | 88.48 March | 3.8× |
| ZamośćLublin, Poland | 2 | 80.08 March | 3.8× |
| RoeselareFlanders, Belgium | 2 | 38.67 March | 3.8× |
| LübeckSchleswig-Holstein, Germany | 2 | 32.03 March | 3.8× |
| CarlowLeinster, Ireland | 1 | 28.29 March | 3.8× |
| OytenLower Saxony, Germany | 1 | 34.24 March | 3.7× |
| WittenbergeBrandenburg, Germany | 1 | 33.04 March | 3.7× |
| StabroekFlanders, Belgium | 1 | 31.97 March | 3.7× |
| MolFlanders, Belgium | 1 | 30.47 March | 3.7× |
| LinköpingÖstergötland, Sweden | 2 | 29.83 March | 3.7× |
| StarachowiceŚwiętokrzyskie, Poland | 2 | 76.48 March | 3.6× |
| GrajewoPodlasie, Poland | 2 | 61.37 March | 3.6× |
| HamburgHamburg, Germany | 4 | 41.04 March | 3.6× |
| WismarMecklenburg-Vorpommern, Germany | 4 | 36.53 March | 3.6× |
| DunkirkHauts-de-France, France | 2 | 36.07 March | 3.6× |
| BremenBremen, Germany | 1 | 35.34 March | 3.6× |
| StrausbergBrandenburg, Germany | 4 | 33.74 March | 3.6× |
| FalkenseeBrandenburg, Germany | 6 | 33.44 March | 3.6× |
| RintelnLower Saxony, Germany | 2 | 33.15 March | 3.6× |
| AntwerpFlanders, Belgium | 1 | 32.47 March | 3.6× |
| BeverenFlanders, Belgium | 1 | 31.67 March | 3.6× |
| KalmarKalmar, Sweden | 3 | 28.52 March | 3.6× |
| LeedsEngland, United Kingdom | 1 | 26.77 March | 3.6× |
| BexleyEngland, United Kingdom | 2 | 26.57 March | 3.6× |
| OpoleOpole Voivodeship, Poland | 7 | 80.71 March | 3.5× |
| KadaňÚstí nad Labem Region, Czechia | 4 | 36.16 March | 3.5× |
| EvergemFlanders, Belgium | 3 | 34.57 March | 3.5× |
| BéthuneHauts-de-France, France | 1 | 33.67 March | 3.5× |
| RoubaixHauts-de-France, France | 1 | 32.97 March | 3.5× |
| ZwijndrechtFlanders, Belgium | 1 | 31.87 March | 3.5× |
| MechelenFlanders, Belgium | 1 | 31.77 March | 3.5× |
| GentFlanders, Belgium | 1 | 30.57 March | 3.5× |
| WillebroekFlanders, Belgium | 1 | 29.57 March | 3.5× |
| Hansestadt SalzwedelSaxony-Anhalt, Germany | 1 | 29.24 March | 3.5× |
| LubnjowBrandenburg, Germany | 3 | 28.24 March | 3.5× |
| CherbourgNormandy, France | 1 | 25.78 March | 3.5× |
| SzczecinWest Pomerania, Poland | 7 | 64.61 March | 3.4× |
| HalstenbekSchleswig-Holstein, Germany | 3 | 40.24 March | 3.4× |
| IzegemFlanders, Belgium | 2 | 39.67 March | 3.4× |
| WaterfordMunster, Ireland | 2 | 35.49 March | 3.4× |
| FriesoytheLower Saxony, Germany | 1 | 34.44 March | 3.4× |
| KladnoCentral Bohemia, Czechia | 4 | 33.96 March | 3.4× |
| KortrijkFlanders, Belgium | 1 | 32.47 March | 3.4× |
| Burg bei MagdeburgSaxony-Anhalt, Germany | 2 | 32.34 March | 3.4× |
| KapellenFlanders, Belgium | 1 | 30.57 March | 3.4× |
| GöttingenLower Saxony, Germany | 3 | 29.25 March | 3.4× |
| PforzheimBaden-Wurttemberg, Germany | 1 | 26.67 March | 3.4× |
| VisbyGotland, Sweden | 2 | 26.02 March | 3.4× |
| SokolovCarlsbad Region, Czechia | 1 | 25.46 March | 3.4× |
| PrzemyślSubcarpathia, Poland | 6 | 68.129 February | 3.3× |
| LitvínovÚstí nad Labem Region, Czechia | 5 | 51.61 March | 3.3× |
| Frankfurt (Oder)Brandenburg, Germany | 4 | 43.51 March | 3.3× |
| OldenburgLower Saxony, Germany | 2 | 38.44 March | 3.3× |
| Halle (Saale)Saxony-Anhalt, Germany | 5 | 36.85 March | 3.3× |
| LochristiFlanders, Belgium | 1 | 32.87 March | 3.3× |
| GrimbergenFlanders, Belgium | 1 | 32.17 March | 3.3× |
| HildesheimLower Saxony, Germany | 5 | 30.45 March | 3.3× |
| MaldegemFlanders, Belgium | 1 | 30.47 March | 3.3× |
| HasseltFlanders, Belgium | 1 | 28.67 March | 3.3× |
| LondonEngland, United Kingdom | 1 | 27.57 March | 3.3× |
| BrusselsBrussels Capital, Belgium | 1 | 26.97 March | 3.3× |
| RadomskoŁódź Voivodeship, Poland | 4 | 72.65 March | 3.2× |
| RadomMazovia, Poland | 1 | 72.68 March | 3.2× |
| Schwedt (Oder)Brandenburg, Germany | 6 | 42.51 March | 3.2× |
| PotsdamBrandenburg, Germany | 5 | 34.24 March | 3.2× |
| MünsterNorth Rhine-Westphalia, Germany | 2 | 34.16 March | 3.2× |
| Königs WusterhausenBrandenburg, Germany | 4 | 33.54 March | 3.2× |
| MenenFlanders, Belgium | 1 | 33.47 March | 3.2× |
| TilburgNorth Brabant, The Netherlands | 1 | 30.77 March | 3.2× |
| KleinmachnowBrandenburg, Germany | 1 | 28.24 March | 3.2× |
| ZaventemFlanders, Belgium | 1 | 28.17 March | 3.2× |
| WeimarThuringia, Germany | 1 | 27.85 March | 3.2× |
| GroningenGroningen, The Netherlands | 1 | 27.04 March | 3.2× |
| HattingenNorth Rhine-Westphalia, Germany | 1 | 26.74 March | 3.2× |
| EnschedeOverijssel, The Netherlands | 1 | 26.66 March | 3.2× |
| ErfurtThuringia, Germany | 1 | 26.25 March | 3.2× |
| BredaNorth Brabant, The Netherlands | 1 | 26.07 March | 3.2× |
| VenrayLimburg, The Netherlands | 1 | 25.67 March | 3.2× |
| OtwockMazovia, Poland | 1 | 90.38 March | 3.1× |
| Strzelce OpolskieOpole Voivodeship, Poland | 6 | 43.71 March | 3.1× |
| SchwerinMecklenburg-Vorpommern, Germany | 6 | 37.03 March | 3.1× |
| Brandenburg an der HavelBrandenburg, Germany | 3 | 35.34 March | 3.1× |
| LuckenwaldeBrandenburg, Germany | 3 | 31.84 March | 3.1× |
| WuppertalNorth Rhine-Westphalia, Germany | 1 | 30.14 March | 3.1× |
| SaalfeldThuringia, Germany | 1 | 30.05 March | 3.1× |
| IJsselsteinUtrecht, The Netherlands | 2 | 29.76 March | 3.1× |
| ReutlingenBaden-Wurttemberg, Germany | 1 | 27.67 March | 3.1× |
| FilderstadtBaden-Wurttemberg, Germany | 1 | 27.07 March | 3.1× |
| NijmegenGelderland, The Netherlands | 1 | 26.27 March | 3.1× |
| AalenBaden-Wurttemberg, Germany | 2 | 25.77 March | 3.1× |
| HillegomSouth Holland, The Netherlands | 1 | 25.46 March | 3.1× |
| JenaThuringia, Germany | 2 | 25.310 March | 3.1× |
| LegionowoMazovia, Poland | 2 | 65.18 March | 3.0× |
| KutnoŁódź Voivodeship, Poland | 2 | 62.98 March | 3.0× |
| PułtuskMazovia, Poland | 2 | 43.49 March | 3.0× |
| NeubrandenburgMecklenburg-Vorpommern, Germany | 6 | 36.93 March | 3.0× |
| BogatyniaLower Silesia, Poland | 4 | 31.96 March | 3.0× |
| KrefeldNorth Rhine-Westphalia, Germany | 3 | 30.58 March | 3.0× |
| TübingenBaden-Wurttemberg, Germany | 1 | 29.07 March | 3.0× |
| HannoverLower Saxony, Germany | 2 | 28.05 March | 3.0× |
| LüdenscheidNorth Rhine-Westphalia, Germany | 1 | 27.24 March | 3.0× |
| ChambéryAuvergne-Rhône-Alpes, France | 1 | 27.129 February | 3.0× |
| EisenachThuringia, Germany | 1 | 25.55 March | 3.0× |
| RatingenNorth Rhine-Westphalia, Germany | 1 | 25.35 March | 3.0× |
| SalzgitterLower Saxony, Germany | 2 | 25.25 March | 3.0× |
| RacibórzSilesia, Poland | 5 | 66.81 March | 2.9× |
| KrosnoSubcarpathia, Poland | 2 | 43.329 February | 2.9× |
| Zielona GóraLubusz, Poland | 3 | 39.91 March | 2.9× |
| CottbusBrandenburg, Germany | 4 | 33.14 March | 2.9× |
| Bitterfeld-WolfenSaxony-Anhalt, Germany | 4 | 31.85 March | 2.9× |
| ValenciennesHauts-de-France, France | 1 | 31.57 March | 2.9× |
| KehlBaden-Wurttemberg, Germany | 2 | 27.77 March | 2.9× |
| KroměřížZlín, Czechia | 2 | 27.78 March | 2.9× |
| AltenburgThuringia, Germany | 2 | 27.35 March | 2.9× |
| FuldaHesse, Germany | 1 | 26.84 March | 2.9× |
| ZürichZurich, Switzerland | 1 | 25.129 February | 2.9× |
| LudwigsburgBaden-Wurttemberg, Germany | 1 | 25.17 March | 2.9× |
| TepliceÚstí nad Labem Region, Czechia | 3 | 45.21 March | 2.8× |
| Ústí nad LabemÚstí nad Labem Region, Czechia | 4 | 43.41 March | 2.8× |
| OpavaMoravian-Silesian Region, Czechia | 5 | 41.68 March | 2.8× |
| EisenhüttenstadtBrandenburg, Germany | 3 | 36.01 March | 2.8× |
| MagdeburgSaxony-Anhalt, Germany | 1 | 33.94 March | 2.8× |
| Blankenfelde-MahlowBrandenburg, Germany | 5 | 33.24 March | 2.8× |
| WernigerodeSaxony-Anhalt, Germany | 2 | 32.25 March | 2.8× |
| NeuenhagenBrandenburg, Germany | 2 | 30.14 March | 2.8× |
| NeuruppinBrandenburg, Germany | 4 | 30.04 March | 2.8× |
| BadenLower Austria, Austria | 1 | 29.41 March | 2.8× |
| KasselHesse, Germany | 4 | 28.78 March | 2.8× |
| HouthalenFlanders, Belgium | 1 | 28.57 March | 2.8× |
| MaarssenUtrecht, The Netherlands | 2 | 27.86 March | 2.8× |
| StuttgartBaden-Wurttemberg, Germany | 2 | 27.57 March | 2.8× |
| EindhovenNorth Brabant, The Netherlands | 1 | 27.37 March | 2.8× |
| LingenLower Saxony, Germany | 1 | 25.54 March | 2.8× |
| RotterdamSouth Holland, The Netherlands | 1 | 25.37 March | 2.8× |
| KarlsruheBaden-Wurttemberg, Germany | 1 | 25.37 March | 2.8× |
| WłocławekKujawsko-Pomorskie, Poland | 1 | 74.58 March | 2.7× |
| ŁukówLublin, Poland | 2 | 49.99 March | 2.7× |
| České BudějoviceSouth Bohemian Region, Czechia | 2 | 37.428 February | 2.7× |
| WittenbergSaxony-Anhalt, Germany | 5 | 37.04 March | 2.7× |
| Valašské MeziříčíZlín, Czechia | 3 | 36.38 March | 2.7× |
| PraguePrague, Czechia | 3 | 33.46 March | 2.7× |
| PilsenPlzeň Region, Czechia | 4 | 31.95 March | 2.7× |
| MeylanAuvergne-Rhône-Alpes, France | 1 | 31.329 February | 2.7× |
| WeißenfelsSaxony-Anhalt, Germany | 3 | 28.84 March | 2.7× |
| KoblenzRheinland-Pfalz, Germany | 1 | 28.54 March | 2.7× |
| BorkenNorth Rhine-Westphalia, Germany | 1 | 26.98 March | 2.7× |
| DuisburgNorth Rhine-Westphalia, Germany | 2 | 26.05 March | 2.7× |
| WarsteinNorth Rhine-Westphalia, Germany | 1 | 25.88 March | 2.7× |
| BraunschweigLower Saxony, Germany | 1 | 25.54 March | 2.7× |
| PruszkówMazovia, Poland | 1 | 59.58 March | 2.6× |
| AugustówPodlasie, Poland | 1 | 55.38 March | 2.6× |
| Český TěšínMoravian-Silesian Region, Czechia | 6 | 50.328 February | 2.6× |
| CieszynSilesia, Poland | 6 | 50.328 February | 2.6× |
| JarosławSubcarpathia, Poland | 4 | 49.89 March | 2.6× |
| Frýdek-MístekMoravian-Silesian Region, Czechia | 3 | 47.828 February | 2.6× |
| BiałystokPodlasie, Poland | 1 | 43.68 March | 2.6× |
| MostÚstí nad Labem Region, Czechia | 6 | 40.31 March | 2.6× |
| TeltowBrandenburg, Germany | 3 | 38.04 March | 2.6× |
| BytówPomerania, Poland | 4 | 36.78 March | 2.6× |
| LiberecLiberec Region, Czechia | 3 | 31.86 March | 2.6× |
| HagenNorth Rhine-Westphalia, Germany | 2 | 31.54 March | 2.6× |
| DenainHauts-de-France, France | 1 | 28.47 March | 2.6× |
| BielefeldNorth Rhine-Westphalia, Germany | 3 | 28.14 March | 2.6× |
| KaunasKaunas, Lithuania | 2 | 27.92 March | 2.6× |
| UnnaNorth Rhine-Westphalia, Germany | 4 | 27.88 March | 2.6× |
| OsnabrückLower Saxony, Germany | 2 | 26.96 March | 2.6× |
| OberhausenNorth Rhine-Westphalia, Germany | 3 | 25.95 March | 2.6× |
| WawerMazovia, Poland | 1 | 42.08 March | 2.5× |
| KołobrzegWest Pomerania, Poland | 3 | 40.81 March | 2.5× |
| ZnojmoSouth Moravian, Czechia | 1 | 37.02 March | 2.5× |
| Bernau bei BerlinBrandenburg, Germany | 5 | 32.61 March | 2.5× |
| BurghausenBavaria, Germany | 1 | 28.729 February | 2.5× |
| ZlínZlín, Czechia | 1 | 28.78 March | 2.5× |
| TraunreutBavaria, Germany | 1 | 28.129 February | 2.5× |
| DouaiHauts-de-France, France | 1 | 27.87 March | 2.5× |
| DortmundNorth Rhine-Westphalia, Germany | 3 | 27.35 March | 2.5× |
| DattelnNorth Rhine-Westphalia, Germany | 4 | 27.07 March | 2.5× |
| HalberstadtSaxony-Anhalt, Germany | 1 | 25.14 March | 2.5× |
| DębicaSubcarpathia, Poland | 1 | 63.328 February | 2.4× |
| PoznańGreater Poland, Poland | 2 | 62.31 March | 2.4× |
| RzeszówSubcarpathia, Poland | 2 | 56.129 February | 2.4× |
| KatowiceSilesia, Poland | 2 | 55.61 March | 2.4× |
| ŻyrardówMazovia, Poland | 2 | 50.98 March | 2.4× |
| Kędzierzyn-KoźleOpole Voivodeship, Poland | 5 | 48.71 March | 2.4× |
| KościanGreater Poland, Poland | 1 | 47.88 March | 2.4× |
| LęborkPomerania, Poland | 4 | 46.91 March | 2.4× |
| TřinecMoravian-Silesian Region, Czechia | 4 | 44.028 February | 2.4× |
| PłockMazovia, Poland | 1 | 43.28 March | 2.4× |
| BerlinState of Berlin, Germany | 2 | 36.44 March | 2.4× |
| KreuzlingenThurgau, Switzerland | 1 | 27.629 February | 2.4× |
| KonstanzBaden-Wurttemberg, Germany | 1 | 27.629 February | 2.4× |
| MühlhausenThuringia, Germany | 1 | 27.55 March | 2.4× |
| GrenobleAuvergne-Rhône-Alpes, France | 1 | 27.329 February | 2.4× |
| StrasbourgGrand Est, France | 2 | 26.77 March | 2.4× |
| GelsenkirchenNorth Rhine-Westphalia, Germany | 1 | 25.06 March | 2.4× |
| KrakówLesser Poland, Poland | 3 | 61.51 March | 2.3× |
| ZgierzŁódź Voivodeship, Poland | 1 | 56.58 March | 2.3× |
| MielecSubcarpathia, Poland | 4 | 49.11 March | 2.3× |
| OlsztynWarmia-Masuria, Poland | 3 | 36.69 March | 2.3× |
| ŽideniceSouth Moravian, Czechia | 1 | 35.55 March | 2.3× |
| VeszprémVeszprém, Hungary | 2 | 34.62 March | 2.3× |
| Mladá BoleslavCentral Bohemia, Czechia | 1 | 31.46 March | 2.3× |
| BottropNorth Rhine-Westphalia, Germany | 2 | 27.36 March | 2.3× |
| GeraThuringia, Germany | 1 | 27.15 March | 2.3× |
| DillingenSaarland, Germany | 1 | 25.17 March | 2.3× |
| LublinLublin, Poland | 1 | 49.08 March | 2.2× |
| OstravaMoravian-Silesian Region, Czechia | 4 | 46.728 February | 2.2× |
| HavířovMoravian-Silesian Region, Czechia | 2 | 40.32 March | 2.2× |
| Hradec KrálovéHradec Králové Region, Czechia | 1 | 38.728 February | 2.2× |
| ŻaryLubusz, Poland | 2 | 32.21 March | 2.2× |
| BrnoSouth Moravian, Czechia | 1 | 31.75 March | 2.2× |
| DessauSaxony-Anhalt, Germany | 3 | 31.44 March | 2.2× |
| PerchtoldsdorfLower Austria, Austria | 2 | 29.61 March | 2.2× |
| ViennaVienna, Austria | 2 | 28.81 March | 2.2× |
| MödlingLower Austria, Austria | 1 | 28.41 March | 2.2× |
| IngolstadtBavaria, Germany | 1 | 28.01 March | 2.2× |
| UlmBaden-Wurttemberg, Germany | 2 | 27.329 February | 2.2× |
| LindauBavaria, Germany | 1 | 27.229 February | 2.2× |
| Boulogne-sur-MerHauts-de-France, France | 1 | 26.07 March | 2.2× |
| FriedrichshafenBaden-Wurttemberg, Germany | 1 | 25.829 February | 2.2× |
| GreizThuringia, Germany | 2 | 25.61 March | 2.2× |
| HeilbronnBaden-Wurttemberg, Germany | 1 | 25.04 March | 2.2× |
| Jastrzębie ZdrójSilesia, Poland | 1 | 58.728 February | 2.1× |
| NiskoSubcarpathia, Poland | 1 | 46.29 March | 2.1× |
| BydgoszczKujawsko-Pomorskie, Poland | 1 | 45.21 March | 2.1× |
| Cluj-NapocaCluj County, Romania | 1 | 44.429 February | 2.1× |
| DěčínÚstí nad Labem Region, Czechia | 1 | 43.21 March | 2.1× |
| Konstancin-JeziornaMazovia, Poland | 2 | 42.89 March | 2.1× |
| WarsawMazovia, Poland | 1 | 40.98 March | 2.1× |
| NáchodHradec Králové Region, Czechia | 1 | 38.68 March | 2.1× |
| KlosterneuburgLower Austria, Austria | 1 | 30.72 March | 2.1× |
| PřerovOlomouc Region, Czechia | 1 | 29.48 March | 2.1× |
| Bad KreuznachRheinland-Pfalz, Germany | 1 | 27.829 February | 2.1× |
| Romans-sur-IsèreAuvergne-Rhône-Alpes, France | 1 | 26.229 February | 2.1× |
| WeidenBavaria, Germany | 1 | 25.21 March | 2.1× |
| Gorzów WielkopolskiLubusz, Poland | 1 | 49.91 March | 2.0× |
| Vranov nad TopľouPrešov Region, Slovakia | 1 | 36.61 March | 2.0× |
| GdyniaPomerania, Poland | 1 | 34.32 March | 2.0× |
| PardubicePardubice Region, Czechia | 1 | 29.76 March | 2.0× |
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 Germany and Poland
Number 11 of 62 episodes in Germany and Poland since our records began, by cities reached.
- Europe, 6 to 25 February 2023608
- Europe, 14 February to 1 March 2025517
- Europe, 1 to 14 February 2025506
- Europe, January and February 2026502
- Germany, Poland and 25 more countries, March 2025463
- Europe, 8 to 27 January 2024449
- Europe, 1 to 12 March 2026444
- Germany, France and 18 more countries, January 2025381
- Europe, 18 to 25 March 2026362
- Europe, March 2025335
- Europe, February and March 2024264
- Europe, November 2024260
Bars: cities reached; colour: the level of the episode's highest daily reading. All 62.
Use this page
SmogRank, Europe, February and March 2024: 264 cities with PM2.5 at twice their usual or more, 28 February to 10 March 2024, smogrank.com/episodes/2024-02-europe (accessed 4 October 2026).
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.