SmogRank / Episodes / Czechia
Czechia and Poland, November 2025
For 2 days, from 1 to 2 November 2025, 17 cities in Czechia, Poland and Slovakia had PM2.5 at least twice their usual for the time of year. The worst reading was Dębica, Subcarpathia, Poland: 41.9 µg/m³ on 1 November, about 2.6× its usual 16.4.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 17 in 3 countries
Days 2 1 to 2 November 2025
Worst day 1 November 10 cities counted
Furthest above usual 3.9× Most
Day by day
Play 1 November 10 cities at twice their usual or more
Kalisz Wrocław Poznań Opole Kędzierzyn-Koźle Bydgoszcz Łask Racibórz Opava Jelenia Góra Włocławek Sulechów Zgierz Ostrava Kutno Zielona Góra Jastrzębie Zdrój Łódź Świecie Olomouc Katowice Karviná Havířov Hranice Frýdek-Místek Přerov Valašské Meziříčí Třinec Czechowice-Dziedzice Pardubice Kroměříž Żary Bielsko-Biala Zlín Płock Gorzów Wielkopolski Čadca Bytów Kościerzyna Židenice Liberec Žďár nad Sázavou Brno Żywiec Bogatynia Púchov Žilina Trenčín Hodonín Mladá Boleslav Eisenhüttenstadt Kraków Jihlava Martin Senica Żyrardów Frankfurt (Oder) Prievidza Gdynia Znojmo Partizánske Ružomberok Cottbus Handlová Kołobrzeg Malacky Kielce Liptovský Mikuláš Žiar nad Hronom Banská Bystrica Pruszków Ciechanów Prague Skarżysko-Kamienna Szczecin Zvolen Schwedt (Oder) Stodůlky Lubnjow Legionowo Ústí nad Labem Warsaw Starachowice Konstancin-Jeziorna Radom Kladno Olsztyn Strausberg Wawer Poprad Otwock Tarnów Neuenhagen Königs Wusterhausen České Budějovice Bernau bei Berlin Blankenfelde-Mahlow Berlin Mielec Teltow Kleinmachnow Luckenwalde Oranienburg Jasło Bardejov Potsdam Falkensee Pilsen Prešov Neubrandenburg Nauen Krosno Košice Rzeszów Nisko Wittenberg Neuruppin Brandenburg an der Havel Sokolov Passau Altenburg Lublin Stralsund Bitterfeld-Wolfen Humenné Trebišov Dessau Greiz Ełk Snina Zeitz Jarosław Gera Merseburg Halle (Saale) Köthen Weißenfels Przemyśl Marktredwitz Burg bei Magdeburg Weiden Stendal Güstrow Bernburg Schwandorf in Bayern Zamość Magdeburg Rostock Białystok Wittenberge Jena Augustów Suwałki Weimar Kelheim Schwerin Halberstadt Wismar Hansestadt Salzwedel Erfurt Ingolstadt Nuremberg Radomsko Vranov nad Topľou Gdańsk Toruń Děčín Elbląg Hradec Králové Kłodzko Bohumín Český Těšín Teplice Dębica Beroun Brzeg Kadaň Litvínov Most 29 Oct 30 31 1 Nov 2 3 4 5 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
Radomsko Radomsko, 29 October: 9.6 µg/m³, 0.5× usual Radomsko, 30 October: 9.7 µg/m³, 0.5× usual Radomsko, 31 October: 44.6 µg/m³, 2.4× usual Radomsko, 1 November: 26.0 µg/m³, 1.4× usual Radomsko, 2 November: 38.0 µg/m³, 2.1× usual Radomsko, 3 November: 17.8 µg/m³, 1.0× usual Radomsko, 4 November: 29.6 µg/m³, 1.6× usual Radomsko, 5 November: 27.8 µg/m³, 1.5× usual Dębica Dębica, 29 October: 8.1 µg/m³, 0.5× usual Dębica, 30 October: 6.1 µg/m³, 0.4× usual Dębica, 31 October: 25.4 µg/m³, 1.5× usual Dębica, 1 November: 41.9 µg/m³, 2.6× usual Dębica, 2 November: 10.5 µg/m³, 0.6× usual Dębica, 3 November: 12.0 µg/m³, 0.7× usual Dębica, 4 November: 26.9 µg/m³, 1.6× usual Dębica, 5 November: 50.5 µg/m³, 3.1× usual Kłodzko Kłodzko, 29 October: 5.0 µg/m³, 0.3× usual Kłodzko, 30 October: 6.0 µg/m³, 0.3× usual Kłodzko, 31 October: 29.4 µg/m³, 1.7× usual Kłodzko, 1 November: 41.4 µg/m³, 2.3× usual Kłodzko, 2 November: 29.5 µg/m³, 1.7× usual Kłodzko, 3 November: 13.9 µg/m³, 0.8× usual Kłodzko, 4 November: 24.7 µg/m³, 1.4× usual Kłodzko, 5 November: 31.1 µg/m³, 1.8× usual Brzeg Brzeg, 29 October: 8.0 µg/m³, 0.7× usual Brzeg, 30 October: 7.8 µg/m³, 0.7× usual Brzeg, 31 October: 12.4 µg/m³, 1.0× usual Brzeg, 1 November: 34.8 µg/m³, 2.9× usual Brzeg, 2 November: 19.6 µg/m³, 1.6× usual Brzeg, 3 November: 7.5 µg/m³, 0.6× usual Brzeg, 4 November: 15.7 µg/m³, 1.3× usual Brzeg, 5 November: 20.4 µg/m³, 1.7× usual Beroun Beroun, 29 October: no reading Beroun, 30 October: 13.0 µg/m³, 0.9× usual Beroun, 31 October: 19.2 µg/m³, 1.4× usual Beroun, 1 November: 31.2 µg/m³, 2.2× usual Beroun, 2 November: 37.4 µg/m³, 2.7× usual Beroun, 3 November: 9.8 µg/m³, 0.7× usual Beroun, 4 November: no reading Beroun, 5 November: no reading Most Most, 29 October: no reading Most, 30 October: no reading Most, 31 October: 11.1 µg/m³, 1.1× usual Most, 1 November: 30.8 µg/m³, 3.1× usual Most, 2 November: 38.6 µg/m³, 3.9× usual Most, 3 November: no reading Most, 4 November: no reading Most, 5 November: no reading Litvínov Litvínov, 29 October: no reading Litvínov, 30 October: no reading Litvínov, 31 October: 11.4 µg/m³, 1.0× usual Litvínov, 1 November: 29.5 µg/m³, 2.7× usual Litvínov, 2 November: 36.1 µg/m³, 3.3× usual Litvínov, 3 November: no reading Litvínov, 4 November: no reading Litvínov, 5 November: no reading Bohumín Bohumín, 29 October: no reading Bohumín, 30 October: no reading Bohumín, 31 October: 10.9 µg/m³, 0.8× usual Bohumín, 1 November: 29.4 µg/m³, 2.3× usual Bohumín, 2 November: 11.0 µg/m³, 0.8× usual Bohumín, 3 November: 5.2 µg/m³, 0.4× usual Bohumín, 4 November: no reading Bohumín, 5 November: no reading Kadaň Kadaň, 29 October: no reading Kadaň, 30 October: no reading Kadaň, 31 October: 9.0 µg/m³, 1.0× usual Kadaň, 1 November: 28.8 µg/m³, 3.2× usual Kadaň, 2 November: no reading Kadaň, 3 November: no reading Kadaň, 4 November: no reading Kadaň, 5 November: no reading Český Těšín Český Těšín, 29 October: no reading Český Těšín, 30 October: 10.2 µg/m³, 0.8× usual Český Těšín, 31 October: 12.7 µg/m³, 1.0× usual Český Těšín, 1 November: 28.0 µg/m³, 2.3× usual Český Těšín, 2 November: 13.4 µg/m³, 1.1× usual Český Těšín, 3 November: 10.0 µg/m³, 0.8× usual Český Těšín, 4 November: no reading Český Těšín, 5 November: no reading Teplice Teplice, 29 October: no reading Teplice, 30 October: no reading Teplice, 31 October: 13.9 µg/m³, 1.3× usual Teplice, 1 November: 27.4 µg/m³, 2.6× usual Teplice, 2 November: no reading Teplice, 3 November: no reading Teplice, 4 November: no reading Teplice, 5 November: no reading Děčín Děčín, 29 October: no reading Děčín, 30 October: no reading Děčín, 31 October: 19.7 µg/m³, 1.3× usual Děčín, 1 November: 25.3 µg/m³, 1.7× usual Děčín, 2 November: 33.0 µg/m³, 2.2× usual Děčín, 3 November: 12.7 µg/m³, 0.9× usual Děčín, 4 November: no reading Děčín, 5 November: no reading Toruń Toruń, 29 October: 10.8 µg/m³, 0.8× usual Toruń, 30 October: 12.3 µg/m³, 0.9× usual Toruń, 31 October: 11.4 µg/m³, 0.8× usual Toruń, 1 November: 24.7 µg/m³, 1.8× usual Toruń, 2 November: 30.0 µg/m³, 2.2× usual Toruń, 3 November: 18.4 µg/m³, 1.3× usual Toruń, 4 November: 17.0 µg/m³, 1.2× usual Toruń, 5 November: 26.9 µg/m³, 1.9× usual Elbląg Elbląg, 29 October: 10.4 µg/m³, 0.8× usual Elbląg, 30 October: 9.0 µg/m³, 0.7× usual Elbląg, 31 October: 9.3 µg/m³, 0.7× usual Elbląg, 1 November: 15.0 µg/m³, 1.2× usual Elbląg, 2 November: 29.9 µg/m³, 2.3× usual Elbląg, 3 November: 25.9 µg/m³, 2.0× usual Elbląg, 4 November: 17.7 µg/m³, 1.4× usual Elbląg, 5 November: 19.7 µg/m³, 1.5× usual Hradec Králové Hradec Králové, 29 October: 2.0 µg/m³, 0.2× usual Hradec Králové, 30 October: 9.0 µg/m³, 0.7× usual Hradec Králové, 31 October: 11.5 µg/m³, 0.9× usual Hradec Králové, 1 November: 23.1 µg/m³, 1.9× usual Hradec Králové, 2 November: 28.0 µg/m³, 2.3× usual Hradec Králové, 3 November: 6.8 µg/m³, 0.6× usual Hradec Králové, 4 November: no reading Hradec Králové, 5 November: no reading Vranov nad Topľou Vranov nad Topľou, 29 October: no reading Vranov nad Topľou, 30 October: no reading Vranov nad Topľou, 31 October: no reading Vranov nad Topľou, 1 November: 17.8 µg/m³, 1.4× usual Vranov nad Topľou, 2 November: 26.2 µg/m³, 2.1× usual Vranov nad Topľou, 3 November: 14.3 µg/m³, 1.2× usual Vranov nad Topľou, 4 November: 8.0 µg/m³, 0.6× usual Vranov nad Topľou, 5 November: 14.4 µg/m³, 1.2× usual Gdańsk Gdańsk, 29 October: 11.0 µg/m³, 1.0× usual Gdańsk, 30 October: 14.1 µg/m³, 1.2× usual Gdańsk, 31 October: 10.0 µg/m³, 0.9× usual Gdańsk, 1 November: 24.8 µg/m³, 2.2× usual Gdańsk, 2 November: 25.1 µg/m³, 2.2× usual Gdańsk, 3 November: 17.5 µg/m³, 1.5× usual Gdańsk, 4 November: 12.6 µg/m³, 1.1× usual Gdańsk, 5 November: 18.6 µg/m³, 1.6× usual 29 Oct 30 31 1 Nov 2 3 4 5 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
Most Ústí nad Labem Region, Czechia 2 2 November 10.0 3.9× Litvínov Ústí nad Labem Region, Czechia 2 2 November 10.9 3.3× Kadaň Ústí nad Labem Region, Czechia 1 1 November 9.1 3.2× Dębica Subcarpathia, Poland 1 5 November 16.4 3.1× Brzeg Opole Voivodeship, Poland 1 1 November 12.0 2.9× Beroun Central Bohemia, Czechia 2 2 November 13.9 2.7× Teplice Ústí nad Labem Region, Czechia 1 1 November 10.7 2.6× Radomsko Łódź Voivodeship, Poland 1 31 October 18.4 2.4× Kłodzko Lower Silesia, Poland 1 1 November 17.7 2.3× Elbląg Warmia-Masuria, Poland 1 2 November 12.8 2.3× Český Těšín Moravian-Silesian Region, Czechia 1 1 November 12.1 2.3× Hradec Králové Hradec Králové Region, Czechia 1 2 November 12.3 2.3× Bohumín Moravian-Silesian Region, Czechia 1 1 November 13.0 2.3× Děčín Ústí nad Labem Region, Czechia 1 2 November 14.8 2.2× Gdańsk Pomerania, Poland 1 2 November 11.4 2.2× Toruń Kujawsko-Pomorskie, Poland 1 2 November 13.8 2.2× Vranov nad Topľou Prešov Region, Slovakia 1 2 November 12.4 2.1×
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 17 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 Czechia and Poland, November 2025 17 Bars: cities reached; colour: the level of the episode's highest daily reading. All 30 .
Use this page SmogRank, Czechia and Poland, November 2025: 17 cities with PM2.5 at twice their usual or more, 1 to 2 November 2025, smogrank.com/episodes/2025-11-czechia-and-poland (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.
