SmogRank / Episodes / Czechia
Eastern Europe, January 2025
For 4 days, from 5 to 8 January 2025, 26 cities in Czechia, Poland, Bulgaria and 4 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Niš, Central Serbia, Serbia: 117.0 µg/m³ on 6 January, about 2.1× its usual 56.1.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 26 in 7 countries
Days 4 5 to 8 January 2025
Worst day 6 January 11 cities counted
Furthest above usual 4.1× Bohumín
Day by day
Play 6 January 11 cities at twice their usual or more
Szeged Dunaújváros Gyál Liberpolis Novi Sad Futog Gyöngyös Pécs Esztergom Zemun Veszprém Belgrade Pančevo Miskolc Obrenovac Kazincbarcika Komárno Sremčica Debrecen Lazarevac Smederevo Valjevo Banská Bystrica Győr Handlová Nitra Partizánske Prievidza Nyíregyháza Liptovský Mikuláš Ružomberok Poprad Sereď Martin Užice Košice Čačak Trnava Kragujevac Senec Žilina Koprivnica Trenčín Púchov Prešov Trebišov Sarajevo Pezinok Kraljevo Banja Luka Bratislava Čadca Ćuprija Vranov nad Topľou Senica Devínska Nová Ves Żywiec Bardejov Malacky Humenné Třinec Bielsko-Biala Zlín Český Těšín Valašské Meziříčí Frýdek-Místek Bor Havířov Novi Pazar Snina Kraków Kroměříž Negotin Přerov Jasło Vienna Mödling Tarnów Baden Zagreb Perchtoldsdorf Klosterneuburg Katowice Ptuj Krosno Opava Olomouc Dębica Maribor Židenice Mielec Bihać Strzelce Opolskie Rzeszów Dej Graz Sankt Pölten Celje Kielce Pirot Opole Przemyśl Radomsko Novo Mesto Jarosław Trbovlje Nisko Starachowice Wolfsberg Brzeg Kłodzko Amstetten Łask Radom Ljubljana Pardubice Łódź Wrocław Hradec Králové Kranj Zgierz Rijeka Klagenfurt am Wörthersee Tomaszów Lubelski Steyr Kalisz Botevgrad Zamość Lublin Ansfelden Krotoszyn Linz Traun České Budějovice Wels Koper Gorizia Mladá Boleslav Liberec Prague Lubań Stodůlky Bogatynia Sevlievo Passau Gabrovo Salzburg Bucharest Żary Saalfelden am Steinernen Meer Děčín Ústí nad Labem Burghausen Traunreut Most Litvínov Kadaň Cottbus Lubnjow Sokolov Altenburg Wittenberg Brno Teplice Niš Jelenia Góra Skarżysko-Kamienna Haskovo Lučenec Zvolen Znojmo Žiar nad Hronom Cluj-Napoca Ostrava Kladno Craiova Jastrzębie Zdrój Racibórz Dimitrovgrad Beroun Pristina Kędzierzyn-Koźle Pilsen Ruse Czechowice-Dziedzice Codlea Sofia Bohumín 2 Jan 3 4 5 6 7 8 9 10 11 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
Pristina Pristina, 2 January: 110.0 µg/m³, 3.5× usual Pristina, 3 January: 14.6 µg/m³, 0.5× usual Pristina, 4 January: 21.5 µg/m³, 0.7× usual Pristina, 5 January: 97.5 µg/m³, 3.1× usual Pristina, 6 January: 91.1 µg/m³, 2.9× usual Pristina, 7 January: 29.4 µg/m³, 0.9× usual Pristina, 8 January: 19.2 µg/m³, 0.6× usual Pristina, 9 January: 20.5 µg/m³, 0.7× usual Pristina, 10 January: 17.1 µg/m³, 0.5× usual Pristina, 11 January: 10.9 µg/m³, 0.4× usual Craiova Craiova, 2 January: 49.3 µg/m³, 2.5× usual Craiova, 3 January: 32.5 µg/m³, 1.6× usual Craiova, 4 January: 6.3 µg/m³, 0.3× usual Craiova, 5 January: 23.7 µg/m³, 1.2× usual Craiova, 6 January: 36.4 µg/m³, 1.8× usual Craiova, 7 January: 45.8 µg/m³, 2.3× usual Craiova, 8 January: 46.7 µg/m³, 2.4× usual Craiova, 9 January: 40.9 µg/m³, 2.1× usual Craiova, 10 January: 25.2 µg/m³, 1.3× usual Craiova, 11 January: 7.8 µg/m³, 0.4× usual Znojmo Znojmo, 2 January: 29.4 µg/m³, 2.2× usual Znojmo, 3 January: 6.7 µg/m³, 0.5× usual Znojmo, 4 January: 8.3 µg/m³, 0.6× usual Znojmo, 5 January: 17.4 µg/m³, 1.3× usual Znojmo, 6 January: 29.7 µg/m³, 2.2× usual Znojmo, 7 January: 19.9 µg/m³, 1.5× usual Znojmo, 8 January: 7.6 µg/m³, 0.6× usual Znojmo, 9 January: no reading Znojmo, 10 January: no reading Znojmo, 11 January: no reading Žiar nad Hronom Žiar nad Hronom, 2 January: 26.2 µg/m³, 1.9× usual Žiar nad Hronom, 3 January: 18.9 µg/m³, 1.4× usual Žiar nad Hronom, 4 January: 5.2 µg/m³, 0.4× usual Žiar nad Hronom, 5 January: 12.4 µg/m³, 0.9× usual Žiar nad Hronom, 6 January: 18.3 µg/m³, 1.4× usual Žiar nad Hronom, 7 January: 31.4 µg/m³, 2.3× usual Žiar nad Hronom, 8 January: 20.3 µg/m³, 1.5× usual Žiar nad Hronom, 9 January: 17.7 µg/m³, 1.3× usual Žiar nad Hronom, 10 January: 3.1 µg/m³, 0.2× usual Žiar nad Hronom, 11 January: 3.1 µg/m³, 0.2× usual Brno Brno, 2 January: 25.5 µg/m³, 2.0× usual Brno, 3 January: 12.2 µg/m³, 1.0× usual Brno, 4 January: 7.4 µg/m³, 0.6× usual Brno, 5 January: 15.9 µg/m³, 1.3× usual Brno, 6 January: 21.0 µg/m³, 1.7× usual Brno, 7 January: 26.0 µg/m³, 2.0× usual Brno, 8 January: 13.5 µg/m³, 1.1× usual Brno, 9 January: no reading Brno, 10 January: no reading Brno, 11 January: no reading Czechowice-Dziedzice Czechowice-Dziedzice, 2 January: 9.6 µg/m³, 0.5× usual Czechowice-Dziedzice, 3 January: 7.6 µg/m³, 0.4× usual Czechowice-Dziedzice, 4 January: 33.1 µg/m³, 1.7× usual Czechowice-Dziedzice, 5 January: 72.0 µg/m³, 3.7× usual Czechowice-Dziedzice, 6 January: 33.6 µg/m³, 1.7× usual Czechowice-Dziedzice, 7 January: 14.2 µg/m³, 0.7× usual Czechowice-Dziedzice, 8 January: 8.5 µg/m³, 0.4× usual Czechowice-Dziedzice, 9 January: 13.9 µg/m³, 0.7× usual Czechowice-Dziedzice, 10 January: 4.9 µg/m³, 0.3× usual Czechowice-Dziedzice, 11 January: 5.8 µg/m³, 0.3× usual Bohumín Bohumín, 2 January: 9.5 µg/m³, 0.6× usual Bohumín, 3 January: 7.7 µg/m³, 0.5× usual Bohumín, 4 January: 13.3 µg/m³, 0.8× usual Bohumín, 5 January: 69.1 µg/m³, 4.1× usual Bohumín, 6 January: 20.9 µg/m³, 1.2× usual Bohumín, 7 January: 27.0 µg/m³, 1.6× usual Bohumín, 8 January: 5.0 µg/m³, 0.3× usual Bohumín, 9 January: no reading Bohumín, 10 January: no reading Bohumín, 11 January: no reading Jastrzębie Zdrój Jastrzębie Zdrój, 2 January: 18.7 µg/m³, 0.7× usual Jastrzębie Zdrój, 3 January: 14.7 µg/m³, 0.6× usual Jastrzębie Zdrój, 4 January: 20.3 µg/m³, 0.8× usual Jastrzębie Zdrój, 5 January: 64.2 µg/m³, 2.5× usual Jastrzębie Zdrój, 6 January: 25.6 µg/m³, 1.0× usual Jastrzębie Zdrój, 7 January: 19.2 µg/m³, 0.8× usual Jastrzębie Zdrój, 8 January: 10.4 µg/m³, 0.4× usual Jastrzębie Zdrój, 9 January: 19.3 µg/m³, 0.8× usual Jastrzębie Zdrój, 10 January: 8.3 µg/m³, 0.3× usual Jastrzębie Zdrój, 11 January: 10.5 µg/m³, 0.4× usual Racibórz Racibórz, 2 January: 18.8 µg/m³, 0.7× usual Racibórz, 3 January: 12.2 µg/m³, 0.5× usual Racibórz, 4 January: 24.0 µg/m³, 0.9× usual Racibórz, 5 January: 62.5 µg/m³, 2.5× usual Racibórz, 6 January: 21.4 µg/m³, 0.8× usual Racibórz, 7 January: 18.0 µg/m³, 0.7× usual Racibórz, 8 January: 12.7 µg/m³, 0.5× usual Racibórz, 9 January: 12.6 µg/m³, 0.5× usual Racibórz, 10 January: 6.3 µg/m³, 0.2× usual Racibórz, 11 January: 9.5 µg/m³, 0.4× usual Skarżysko-Kamienna Skarżysko-Kamienna, 2 January: 13.5 µg/m³, 0.5× usual Skarżysko-Kamienna, 3 January: 18.3 µg/m³, 0.6× usual Skarżysko-Kamienna, 4 January: 49.4 µg/m³, 1.7× usual Skarżysko-Kamienna, 5 January: 60.0 µg/m³, 2.1× usual Skarżysko-Kamienna, 6 January: 26.8 µg/m³, 0.9× usual Skarżysko-Kamienna, 7 January: 31.6 µg/m³, 1.1× usual Skarżysko-Kamienna, 8 January: 33.1 µg/m³, 1.1× usual Skarżysko-Kamienna, 9 January: 35.6 µg/m³, 1.2× usual Skarżysko-Kamienna, 10 January: 16.3 µg/m³, 0.6× usual Skarżysko-Kamienna, 11 January: 14.8 µg/m³, 0.5× usual Kędzierzyn-Koźle Kędzierzyn-Koźle, 2 January: 16.0 µg/m³, 0.9× usual Kędzierzyn-Koźle, 3 January: 9.9 µg/m³, 0.5× usual Kędzierzyn-Koźle, 4 January: 30.9 µg/m³, 1.7× usual Kędzierzyn-Koźle, 5 January: 54.6 µg/m³, 3.0× usual Kędzierzyn-Koźle, 6 January: 11.6 µg/m³, 0.6× usual Kędzierzyn-Koźle, 7 January: 14.0 µg/m³, 0.8× usual Kędzierzyn-Koźle, 8 January: 11.2 µg/m³, 0.6× usual Kędzierzyn-Koźle, 9 January: 9.9 µg/m³, 0.5× usual Kędzierzyn-Koźle, 10 January: 5.1 µg/m³, 0.3× usual Kędzierzyn-Koźle, 11 January: 5.7 µg/m³, 0.3× usual Jelenia Góra Jelenia Góra, 2 January: 7.0 µg/m³, 0.4× usual Jelenia Góra, 3 January: 5.1 µg/m³, 0.3× usual Jelenia Góra, 4 January: 18.8 µg/m³, 1.1× usual Jelenia Góra, 5 January: 38.1 µg/m³, 2.1× usual Jelenia Góra, 6 January: 8.5 µg/m³, 0.5× usual Jelenia Góra, 7 January: 4.8 µg/m³, 0.3× usual Jelenia Góra, 8 January: 13.1 µg/m³, 0.7× usual Jelenia Góra, 9 January: 4.9 µg/m³, 0.3× usual Jelenia Góra, 10 January: 4.0 µg/m³, 0.2× usual Jelenia Góra, 11 January: 5.3 µg/m³, 0.3× usual Ostrava Ostrava, 2 January: 14.2 µg/m³, 1.0× usual Ostrava, 3 January: 9.8 µg/m³, 0.7× usual Ostrava, 4 January: 8.7 µg/m³, 0.6× usual Ostrava, 5 January: 34.1 µg/m³, 2.3× usual Ostrava, 6 January: 10.8 µg/m³, 0.7× usual Ostrava, 7 January: 14.9 µg/m³, 1.0× usual Ostrava, 8 January: 6.9 µg/m³, 0.5× usual Ostrava, 9 January: no reading Ostrava, 10 January: no reading Ostrava, 11 January: no reading Niš Niš, 2 January: no reading Niš, 3 January: no reading Niš, 4 January: 40.8 µg/m³, 0.7× usual Niš, 5 January: 86.9 µg/m³, 1.5× usual Niš, 6 January: 117.0 µg/m³, 2.1× usual Niš, 7 January: 65.5 µg/m³, 1.2× usual Niš, 8 January: 71.3 µg/m³, 1.3× usual Niš, 9 January: 67.4 µg/m³, 1.2× usual Niš, 10 January: 18.6 µg/m³, 0.3× usual Niš, 11 January: 18.7 µg/m³, 0.3× usual Codlea Codlea, 2 January: 50.2 µg/m³, 1.7× usual Codlea, 3 January: 42.3 µg/m³, 1.4× usual Codlea, 4 January: 6.9 µg/m³, 0.2× usual Codlea, 5 January: 35.7 µg/m³, 1.2× usual Codlea, 6 January: 63.7 µg/m³, 2.2× usual Codlea, 7 January: 112.0 µg/m³, 3.8× usual Codlea, 8 January: 63.1 µg/m³, 2.1× usual Codlea, 9 January: 55.0 µg/m³, 1.9× usual Codlea, 10 January: 36.5 µg/m³, 1.2× usual Codlea, 11 January: 27.2 µg/m³, 0.9× usual Ruse Ruse, 2 January: no reading Ruse, 3 January: 29.3 µg/m³, 1.8× usual Ruse, 4 January: 6.6 µg/m³, 0.4× usual Ruse, 5 January: 22.6 µg/m³, 1.4× usual Ruse, 6 January: 56.4 µg/m³, 3.5× usual Ruse, 7 January: 45.4 µg/m³, 2.8× usual Ruse, 8 January: 30.7 µg/m³, 1.9× usual Ruse, 9 January: no reading Ruse, 10 January: no reading Ruse, 11 January: no reading Beroun Beroun, 2 January: 6.6 µg/m³, 0.4× usual Beroun, 3 January: 8.8 µg/m³, 0.5× usual Beroun, 4 January: 10.3 µg/m³, 0.6× usual Beroun, 5 January: 23.7 µg/m³, 1.4× usual Beroun, 6 January: 49.5 µg/m³, 2.9× usual Beroun, 7 January: 19.2 µg/m³, 1.1× usual Beroun, 8 January: 3.2 µg/m³, 0.2× usual Beroun, 9 January: no reading Beroun, 10 January: no reading Beroun, 11 January: no reading Pilsen Pilsen, 2 January: 4.8 µg/m³, 0.4× usual Pilsen, 3 January: 5.3 µg/m³, 0.4× usual Pilsen, 4 January: 8.6 µg/m³, 0.7× usual Pilsen, 5 January: 23.7 µg/m³, 1.9× usual Pilsen, 6 January: 40.6 µg/m³, 3.3× usual Pilsen, 7 January: 6.4 µg/m³, 0.5× usual Pilsen, 8 January: 2.5 µg/m³, 0.2× usual Pilsen, 9 January: no reading Pilsen, 10 January: no reading Pilsen, 11 January: no reading Sofia Sofia, 2 January: no reading Sofia, 3 January: 16.9 µg/m³, 1.3× usual Sofia, 4 January: 4.7 µg/m³, 0.4× usual Sofia, 5 January: 15.6 µg/m³, 1.2× usual Sofia, 6 January: 32.3 µg/m³, 2.4× usual Sofia, 7 January: 52.5 µg/m³, 4.0× usual Sofia, 8 January: 38.6 µg/m³, 2.9× usual Sofia, 9 January: no reading Sofia, 10 January: no reading Sofia, 11 January: no reading Kladno Kladno, 2 January: 4.7 µg/m³, 0.4× usual Kladno, 3 January: 5.5 µg/m³, 0.5× usual Kladno, 4 January: 6.7 µg/m³, 0.6× usual Kladno, 5 January: 15.0 µg/m³, 1.3× usual Kladno, 6 January: 29.2 µg/m³, 2.4× usual Kladno, 7 January: 5.5 µg/m³, 0.5× usual Kladno, 8 January: 2.6 µg/m³, 0.2× usual Kladno, 9 January: no reading Kladno, 10 January: no reading Kladno, 11 January: no reading Teplice Teplice, 2 January: 6.5 µg/m³, 0.5× usual Teplice, 3 January: 4.6 µg/m³, 0.3× usual Teplice, 4 January: 7.2 µg/m³, 0.5× usual Teplice, 5 January: 19.5 µg/m³, 1.4× usual Teplice, 6 January: 27.6 µg/m³, 2.0× usual Teplice, 7 January: 17.0 µg/m³, 1.2× usual Teplice, 8 January: 8.1 µg/m³, 0.6× usual Teplice, 9 January: no reading Teplice, 10 January: no reading Teplice, 11 January: no reading Cluj-Napoca Cluj-Napoca, 2 January: 13.2 µg/m³, 0.5× usual Cluj-Napoca, 3 January: 20.8 µg/m³, 0.8× usual Cluj-Napoca, 4 January: 14.1 µg/m³, 0.5× usual Cluj-Napoca, 5 January: 21.5 µg/m³, 0.8× usual Cluj-Napoca, 6 January: 28.3 µg/m³, 1.1× usual Cluj-Napoca, 7 January: 59.7 µg/m³, 2.3× usual Cluj-Napoca, 8 January: 57.3 µg/m³, 2.2× usual Cluj-Napoca, 9 January: 25.2 µg/m³, 1.0× usual Cluj-Napoca, 10 January: 33.2 µg/m³, 1.3× usual Cluj-Napoca, 11 January: 10.9 µg/m³, 0.4× usual Lučenec Lučenec, 2 January: 17.7 µg/m³, 0.7× usual Lučenec, 3 January: 19.7 µg/m³, 0.7× usual Lučenec, 4 January: 10.5 µg/m³, 0.4× usual Lučenec, 5 January: 30.8 µg/m³, 1.1× usual Lučenec, 6 January: 42.7 µg/m³, 1.6× usual Lučenec, 7 January: 59.6 µg/m³, 2.2× usual Lučenec, 8 January: 23.6 µg/m³, 0.9× usual Lučenec, 9 January: 38.6 µg/m³, 1.4× usual Lučenec, 10 January: 9.8 µg/m³, 0.4× usual Lučenec, 11 January: 6.2 µg/m³, 0.2× usual Dimitrovgrad Dimitrovgrad, 2 January: 37.7 µg/m³, 1.7× usual Dimitrovgrad, 3 January: 42.2 µg/m³, 1.9× usual Dimitrovgrad, 4 January: 16.6 µg/m³, 0.8× usual Dimitrovgrad, 5 January: 19.2 µg/m³, 0.9× usual Dimitrovgrad, 6 January: 31.8 µg/m³, 1.5× usual Dimitrovgrad, 7 January: 45.5 µg/m³, 2.1× usual Dimitrovgrad, 8 January: 56.8 µg/m³, 2.6× usual Dimitrovgrad, 9 January: 52.7 µg/m³, 2.4× usual Dimitrovgrad, 10 January: 43.8 µg/m³, 2.0× usual Dimitrovgrad, 11 January: 15.6 µg/m³, 0.7× usual Zvolen Zvolen, 2 January: 23.8 µg/m³, 1.4× usual Zvolen, 3 January: 19.2 µg/m³, 1.1× usual Zvolen, 4 January: 8.6 µg/m³, 0.5× usual Zvolen, 5 January: 16.9 µg/m³, 1.0× usual Zvolen, 6 January: 30.3 µg/m³, 1.8× usual Zvolen, 7 January: 38.0 µg/m³, 2.2× usual Zvolen, 8 January: 16.9 µg/m³, 1.0× usual Zvolen, 9 January: 27.8 µg/m³, 1.6× usual Zvolen, 10 January: no reading Zvolen, 11 January: 5.2 µg/m³, 0.3× usual Haskovo Haskovo, 2 January: 49.5 µg/m³, 2.0× usual Haskovo, 3 January: 47.0 µg/m³, 1.9× usual Haskovo, 4 January: 13.4 µg/m³, 0.5× usual Haskovo, 5 January: 26.6 µg/m³, 1.1× usual Haskovo, 6 January: 35.1 µg/m³, 1.4× usual Haskovo, 7 January: 51.1 µg/m³, 2.1× usual Haskovo, 8 January: 54.0 µg/m³, 2.2× usual Haskovo, 9 January: 43.2 µg/m³, 1.7× usual Haskovo, 10 January: 40.0 µg/m³, 1.6× usual Haskovo, 11 January: 10.8 µg/m³, 0.4× usual 2 Jan 3 4 5 6 7 8 9 10 11 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. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Bohumín Moravian-Silesian Region, Czechia 1 5 January 16.8 4.1× Sofia Sofia-Capital, Bulgaria 3 7 January 13.2 4.0× Codlea Brașov County, Romania 3 7 January 29.6 3.8× Czechowice-Dziedzice Silesia, Poland 1 5 January 19.6 3.7× Pristina Pristina, Kosovo 1 2 January 31.1 3.5× Ruse Ruse, Bulgaria 2 6 January 16.1 3.5× Pilsen Plzeň Region, Czechia 1 6 January 12.4 3.3× Kędzierzyn-Koźle Opole Voivodeship, Poland 1 5 January 18.4 3.0× Beroun Central Bohemia, Czechia 1 6 January 16.8 2.9× Dimitrovgrad Haskovo, Bulgaria 2 8 January 21.9 2.6× Jastrzębie Zdrój Silesia, Poland 1 5 January 25.3 2.5× Craiova Dolj, Romania 3 2 January 19.8 2.5× Racibórz Silesia, Poland 1 5 January 25.5 2.5× Kladno Central Bohemia, Czechia 1 6 January 12.0 2.4× Žiar nad Hronom Banská Bystrica Region, Slovakia 1 7 January 13.5 2.3× Ostrava Moravian-Silesian Region, Czechia 1 5 January 14.7 2.3× Cluj-Napoca Cluj County, Romania 2 7 January 26.4 2.3× Znojmo South Moravian, Czechia 1 6 January 13.5 2.2× Lučenec Banská Bystrica Region, Slovakia 1 7 January 27.1 2.2× Zvolen Banská Bystrica Region, Slovakia 1 7 January 17.3 2.2× Haskovo Haskovo, Bulgaria 1 8 January 24.9 2.2× Jelenia Góra Lower Silesia, Poland 1 5 January 17.8 2.1× Niš Central Serbia, Serbia 1 6 January 56.1 2.1× Skarżysko-Kamienna Świętokrzyskie, Poland 1 5 January 28.9 2.1× Brno South Moravian, Czechia 1 7 January 12.7 2.0× Teplice Ústí nad Labem Region, Czechia 1 6 January 13.7 2.0×
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 Czechia and Poland
Number 13 of 30 episodes in Czechia and Poland since our records began, by cities reached.
Eastern Europe, January 2025 123 Eastern Europe, December 2025 118 Eastern Europe, December 2023 107 Eastern Europe, November 2025 71 Eastern Europe, January 2026 70 Poland and Germany, January 2026 59 Eastern Europe, March 2023 56 North-eastern Europe, December 2025 55 Germany and Poland, February 2026 54 Eastern Europe, September 2023 51 Czechia and Slovakia, November and December 2023 41 Poland, April 2026 32 Eastern Europe, January 2025 26 Bars: cities reached; colour: the level of the episode's highest daily reading. All 30 .
Use this page SmogRank, Eastern Europe, January 2025: 26 cities with PM2.5 at twice their usual or more, 5 to 8 January 2025, smogrank.com/episodes/2025-01-eastern-europe (accessed 2 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.
