SmogRank / Episodes / Poland
Poland and Czechia, January 2023
For 3 days, from 18 to 20 January 2023, 15 cities in Poland and Czechia had PM2.5 at least twice their usual for the time of year. The worst reading was Lębork, Pomerania, Poland: 56.5 µg/m³ on 18 January, about 3.3× its usual 17.0.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 15 in 2 countries
Days 3 18 to 20 January 2023
Worst day 20 January 9 cities counted
Furthest above usual 3.3× Lębork
Day by day
Play 20 January 9 cities at twice their usual or more
Kalisz Szamotuły Nakło nad Notecią Bydgoszcz Opole Nysa Międzyrzecz Kłodzko Włocławek Łask Kędzierzyn-Koźle Zgierz Kościerzyna Gorzów Wielkopolski Łódź Racibórz Żary Opava Radomsko Hradec Králové Jastrzębie Zdrój Ustka Olomouc Katowice Pardubice Karviná Havířov Hranice Gdańsk Liberec Bogatynia Sopot Eisenhüttenstadt Přerov Gdynia Valašské Meziříčí Frankfurt (Oder) Czechowice-Dziedzice Třinec Kroměříž Bielsko-Biala Žďár nad Sázavou Elbląg Cottbus Szczecin Čadca Żyrardów Schwedt (Oder) Jihlava Kraków Lubnjow Děčín Strausberg Pruszków Prague Kielce Świnoujście Eberswalde Ústí nad Labem Olsztyn Legionowo Neuenhagen Königs Wusterhausen Warsaw Kladno Bernau bei Berlin Teplice Konstancin-Jeziorna Pułtusk Wawer Beroun Blankenfelde-Mahlow Radom Berlin Starachowice Otwock Litvínov Most Teltow Kleinmachnow Luckenwalde Falkensee Tarnów Potsdam Neubrandenburg Kadaň Nauen Mielec Kętrzyn Neuruppin Pilsen Dębica Stralsund Brandenburg an der Havel Jasło Bardejov Siedlce Altenburg Bitterfeld-Wolfen Sokolov Łuków Krosno Nisko Rzeszów Greiz Lublin Ełk Köthen Halle (Saale) Grajewo Güstrow Weißenfels Burg bei Magdeburg Rostock Wittenberge Marktredwitz Magdeburg Weiden Jarosław Jena Schwandorf in Bayern Augustów Przemyśl Białystok Suwałki Weimar Schwerin Zamość Wismar Saalfeld Hansestadt Salzwedel Halberstadt Erfurt Coburg Nuremberg Frýdek-Místek Kutno Poznań Płock Bohumín Zielona Góra Český Těšín Ostrava Mladá Boleslav Jelenia Góra Toruń Wrocław Świecie Krapkowice Lębork 15 Jan 16 17 18 19 20 21 22 23 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
Lębork Lębork, 15 January: 7.2 µg/m³, 0.4× usual Lębork, 16 January: 17.6 µg/m³, 1.0× usual Lębork, 17 January: 17.3 µg/m³, 1.0× usual Lębork, 18 January: 56.5 µg/m³, 3.3× usual Lębork, 19 January: 33.5 µg/m³, 2.0× usual Lębork, 20 January: 30.7 µg/m³, 1.8× usual Lębork, 21 January: 14.3 µg/m³, 0.8× usual Lębork, 22 January: 8.9 µg/m³, 0.5× usual Lębork, 23 January: 17.2 µg/m³, 1.0× usual Jelenia Góra Jelenia Góra, 15 January: 3.9 µg/m³, 0.2× usual Jelenia Góra, 16 January: 6.8 µg/m³, 0.4× usual Jelenia Góra, 17 January: 21.4 µg/m³, 1.2× usual Jelenia Góra, 18 January: 43.6 µg/m³, 2.4× usual Jelenia Góra, 19 January: 24.6 µg/m³, 1.4× usual Jelenia Góra, 20 January: 35.0 µg/m³, 1.9× usual Jelenia Góra, 21 January: 12.0 µg/m³, 0.7× usual Jelenia Góra, 22 January: 18.3 µg/m³, 1.0× usual Jelenia Góra, 23 January: 24.9 µg/m³, 1.4× usual Krapkowice Krapkowice, 15 January: 7.8 µg/m³, 0.5× usual Krapkowice, 16 January: 18.2 µg/m³, 1.1× usual Krapkowice, 17 January: 20.5 µg/m³, 1.3× usual Krapkowice, 18 January: 39.4 µg/m³, 2.5× usual Krapkowice, 19 January: 23.9 µg/m³, 1.5× usual Krapkowice, 20 January: 44.2 µg/m³, 2.8× usual Krapkowice, 21 January: 23.5 µg/m³, 1.5× usual Krapkowice, 22 January: 30.9 µg/m³, 1.9× usual Krapkowice, 23 January: 24.5 µg/m³, 1.5× usual Zielona Góra Zielona Góra, 15 January: 6.0 µg/m³, 0.5× usual Zielona Góra, 16 January: 12.9 µg/m³, 1.0× usual Zielona Góra, 17 January: 16.8 µg/m³, 1.3× usual Zielona Góra, 18 January: 28.5 µg/m³, 2.2× usual Zielona Góra, 19 January: 24.2 µg/m³, 1.9× usual Zielona Góra, 20 January: 26.5 µg/m³, 2.1× usual Zielona Góra, 21 January: 15.0 µg/m³, 1.2× usual Zielona Góra, 22 January: 11.7 µg/m³, 0.9× usual Zielona Góra, 23 January: 34.9 µg/m³, 2.7× usual Toruń Toruń, 15 January: 7.4 µg/m³, 0.4× usual Toruń, 16 January: no reading Toruń, 17 January: no reading Toruń, 18 January: 34.1 µg/m³, 1.7× usual Toruń, 19 January: 52.0 µg/m³, 2.6× usual Toruń, 20 January: 29.1 µg/m³, 1.4× usual Toruń, 21 January: 10.5 µg/m³, 0.5× usual Toruń, 22 January: 15.8 µg/m³, 0.8× usual Toruń, 23 January: 24.2 µg/m³, 1.2× usual Bohumín Bohumín, 15 January: 3.8 µg/m³, 0.2× usual Bohumín, 16 January: 8.3 µg/m³, 0.4× usual Bohumín, 17 January: 10.5 µg/m³, 0.5× usual Bohumín, 18 January: 23.8 µg/m³, 1.2× usual Bohumín, 19 January: 43.4 µg/m³, 2.2× usual Bohumín, 20 January: 39.1 µg/m³, 2.0× usual Bohumín, 21 January: 21.7 µg/m³, 1.1× usual Bohumín, 22 January: 33.7 µg/m³, 1.7× usual Bohumín, 23 January: 23.3 µg/m³, 1.2× usual Kutno Kutno, 15 January: 6.7 µg/m³, 0.3× usual Kutno, 16 January: 11.2 µg/m³, 0.5× usual Kutno, 17 January: 18.2 µg/m³, 0.8× usual Kutno, 18 January: 31.0 µg/m³, 1.4× usual Kutno, 19 January: 43.3 µg/m³, 2.0× usual Kutno, 20 January: 30.0 µg/m³, 1.4× usual Kutno, 21 January: 10.3 µg/m³, 0.5× usual Kutno, 22 January: 17.4 µg/m³, 0.8× usual Kutno, 23 January: 24.2 µg/m³, 1.1× usual Świecie Świecie, 15 January: 6.9 µg/m³, 0.5× usual Świecie, 16 January: 10.2 µg/m³, 0.7× usual Świecie, 17 January: 17.6 µg/m³, 1.2× usual Świecie, 18 January: 22.3 µg/m³, 1.5× usual Świecie, 19 January: 39.0 µg/m³, 2.7× usual Świecie, 20 January: 26.9 µg/m³, 1.9× usual Świecie, 21 January: 8.3 µg/m³, 0.6× usual Świecie, 22 January: 13.3 µg/m³, 0.9× usual Świecie, 23 January: 17.2 µg/m³, 1.2× usual Płock Płock, 15 January: 6.9 µg/m³, 0.4× usual Płock, 16 January: 10.9 µg/m³, 0.6× usual Płock, 17 January: 19.5 µg/m³, 1.1× usual Płock, 18 January: 29.4 µg/m³, 1.7× usual Płock, 19 January: 37.0 µg/m³, 2.1× usual Płock, 20 January: 28.2 µg/m³, 1.6× usual Płock, 21 January: 9.2 µg/m³, 0.5× usual Płock, 22 January: 17.4 µg/m³, 1.0× usual Płock, 23 January: 22.1 µg/m³, 1.2× usual Wrocław Wrocław, 15 January: 9.2 µg/m³, 0.5× usual Wrocław, 16 January: 12.1 µg/m³, 0.6× usual Wrocław, 17 January: 18.3 µg/m³, 1.0× usual Wrocław, 18 January: 32.6 µg/m³, 1.7× usual Wrocław, 19 January: 23.7 µg/m³, 1.2× usual Wrocław, 20 January: 52.0 µg/m³, 2.7× usual Wrocław, 21 January: 19.8 µg/m³, 1.0× usual Wrocław, 22 January: 25.5 µg/m³, 1.3× usual Wrocław, 23 January: 33.8 µg/m³, 1.8× usual Poznań Poznań, 15 January: 3.2 µg/m³, 0.2× usual Poznań, 16 January: 9.3 µg/m³, 0.5× usual Poznań, 17 January: 16.5 µg/m³, 0.8× usual Poznań, 18 January: 30.5 µg/m³, 1.5× usual Poznań, 19 January: 29.9 µg/m³, 1.5× usual Poznań, 20 January: 40.7 µg/m³, 2.1× usual Poznań, 21 January: 8.8 µg/m³, 0.4× usual Poznań, 22 January: 17.2 µg/m³, 0.9× usual Poznań, 23 January: 25.2 µg/m³, 1.3× usual Český Těšín Český Těšín, 15 January: 5.3 µg/m³, 0.3× usual Český Těšín, 16 January: 6.1 µg/m³, 0.4× usual Český Těšín, 17 January: 8.7 µg/m³, 0.5× usual Český Těšín, 18 January: 13.1 µg/m³, 0.8× usual Český Těšín, 19 January: 25.4 µg/m³, 1.5× usual Český Těšín, 20 January: 39.1 µg/m³, 2.3× usual Český Těšín, 21 January: 30.6 µg/m³, 1.8× usual Český Těšín, 22 January: 41.1 µg/m³, 2.4× usual Český Těšín, 23 January: 23.8 µg/m³, 1.4× usual Ostrava Ostrava, 15 January: 4.3 µg/m³, 0.3× usual Ostrava, 16 January: 9.1 µg/m³, 0.6× usual Ostrava, 17 January: 10.6 µg/m³, 0.7× usual Ostrava, 18 January: 22.9 µg/m³, 1.4× usual Ostrava, 19 January: 21.9 µg/m³, 1.3× usual Ostrava, 20 January: 38.0 µg/m³, 2.3× usual Ostrava, 21 January: 26.0 µg/m³, 1.6× usual Ostrava, 22 January: 48.0 µg/m³, 2.9× usual Ostrava, 23 January: 25.3 µg/m³, 1.6× usual Frýdek-Místek Frýdek-Místek, 15 January: 4.4 µg/m³, 0.3× usual Frýdek-Místek, 16 January: 3.3 µg/m³, 0.2× usual Frýdek-Místek, 17 January: no reading Frýdek-Místek, 18 January: 16.8 µg/m³, 1.0× usual Frýdek-Místek, 19 January: 24.0 µg/m³, 1.4× usual Frýdek-Místek, 20 January: 34.2 µg/m³, 2.0× usual Frýdek-Místek, 21 January: 26.7 µg/m³, 1.6× usual Frýdek-Místek, 22 January: 35.3 µg/m³, 2.1× usual Frýdek-Místek, 23 January: 21.6 µg/m³, 1.3× usual Mladá Boleslav Mladá Boleslav, 15 January: 3.5 µg/m³, 0.2× usual Mladá Boleslav, 16 January: 1.8 µg/m³, 0.1× usual Mladá Boleslav, 17 January: 9.4 µg/m³, 0.7× usual Mladá Boleslav, 18 January: no reading Mladá Boleslav, 19 January: no reading Mladá Boleslav, 20 January: 33.9 µg/m³, 2.4× usual Mladá Boleslav, 21 January: 6.3 µg/m³, 0.4× usual Mladá Boleslav, 22 January: 15.7 µg/m³, 1.1× usual Mladá Boleslav, 23 January: 16.6 µg/m³, 1.2× usual 15 Jan 16 17 18 19 20 21 22 23 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
Lębork Pomerania, Poland 1 18 January 17.0 3.3× Ostrava Moravian-Silesian Region, Czechia 1 22 January 16.3 2.9× Krapkowice Opole Voivodeship, Poland 2 20 January 16.0 2.8× Zielona Góra Lubusz, Poland 2 23 January 12.8 2.7× Wrocław Lower Silesia, Poland 1 20 January 19.1 2.7× Świecie Kujawsko-Pomorskie, Poland 1 19 January 14.5 2.7× Toruń Kujawsko-Pomorskie, Poland 1 19 January 20.3 2.6× Český Těšín Moravian-Silesian Region, Czechia 1 22 January 16.9 2.4× Jelenia Góra Lower Silesia, Poland 1 18 January 18.1 2.4× Mladá Boleslav Central Bohemia, Czechia 1 20 January 14.4 2.4× Bohumín Moravian-Silesian Region, Czechia 2 19 January 19.3 2.2× Płock Mazovia, Poland 1 19 January 17.7 2.1× Frýdek-Místek Moravian-Silesian Region, Czechia 1 22 January 17.0 2.1× Poznań Greater Poland, Poland 1 20 January 19.7 2.1× Kutno Łódź Voivodeship, Poland 1 19 January 21.6 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 Poland and Czechia
Number 8 of 13 episodes in Poland and Czechia since our records began, by cities reached.
Eastern Europe, December 2023 107 Eastern Europe, March 2023 56 Eastern Europe, September 2023 51 Czechia and Slovakia, November and December 2023 41 Czechia and Austria, October 2023 20 Czechia, Slovakia and Austria, December 2023 16 Poland and Czechia, April 2023 15 Poland and Czechia, January 2023 15 Poland, May 2023 10 Czechia and Poland, April 2023 9 Czechia and Slovakia, January 2023 9 Poland, September 2023 8 Bars: cities reached; colour: the level of the episode's highest daily reading. All 13 .
Use this page SmogRank, Poland and Czechia, January 2023: 15 cities with PM2.5 at twice their usual or more, 18 to 20 January 2023, smogrank.com/episodes/2023-01-poland-and-czechia (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.
