SmogRank / Episodes / Poland
Poland and Czechia, April 2023
For 3 days, from 20 to 22 April 2023, 15 cities in Poland and Czechia had PM2.5 at least twice their usual for the time of year. The worst reading was Jastrzębie Zdrój, Silesia, Poland: 38.4 µg/m³ on 21 April, about 2.4× its usual 16.0.
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 20 to 22 April 2023
Worst day 22 April 12 cities counted
Furthest above usual 3.2× Czechowice-Dziedzice
Day by day
Play 22 April 12 cities at twice their usual or more
Opole Krapkowice Kędzierzyn-Koźle Kalisz Nysa Opava Katowice Wrocław Frýdek-Místek Český Těšín Třinec Bielsko-Biala Hranice Valašské Meziříčí Zgierz Łódź Čadca Olomouc Přerov Kutno Zlín Žilina Kroměříž Púchov Poznań Włocławek Kraków Martin Trenčín Toruń Ružomberok Bydgoszcz Prievidza Płock Nakło nad Notecią Handlová Židenice Partizánske Hodonín Brno Liptovský Mikuláš Senica Banská Bystrica Žiar nad Hronom Kielce Hradec Králové Żyrardów Zvolen Pardubice Poprad Zielona Góra Starachowice Pruszków Tarnów Znojmo Międzyrzecz Radom Jihlava Spišská Nová Ves Legionowo Warsaw Żary Liberec Konstancin-Jeziorna Bogatynia Wawer Mielec Mladá Boleslav Dębica Pułtusk Gorzów Wielkopolski Jasło Bardejov Prešov Eisenhüttenstadt Košice Krosno Prague Frankfurt (Oder) Rzeszów Cottbus Vranov nad Topľou Kladno Ústí nad Labem České Budějovice Beroun Trebišov Humenné Siedlce Łuków Lubnjow Teplice Lublin Snina Schwedt (Oder) Most Litvínov Strausberg Jarosław Przemyśl Königs Wusterhausen Eberswalde Neuenhagen Bernau bei Berlin Kadaň Pilsen Blankenfelde-Mahlow Berlin Zamość Teltow Luckenwalde Kleinmachnow Passau Potsdam Falkensee Białystok Nauen Sokolov Wittenberg Neuruppin Altenburg Brandenburg an der Havel Bitterfeld-Wolfen Greiz Weiden Marktredwitz Weißenfels Halle (Saale) Köthen Schwandorf in Bayern Burg bei Magdeburg Kelheim Wittenberge Havířov Łask Děčín Kościan Ostrava Otwock Kłodzko Nisko Bohumín Jastrzębie Zdrój Karviná Radomsko Jelenia Góra Racibórz Czechowice-Dziedzice 17 Apr 18 19 20 21 22 23 24 25 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
Jastrzębie Zdrój Jastrzębie Zdrój, 17 April: 33.3 µg/m³, 2.1× usual Jastrzębie Zdrój, 18 April: no reading Jastrzębie Zdrój, 19 April: 29.3 µg/m³, 1.8× usual Jastrzębie Zdrój, 20 April: 36.7 µg/m³, 2.3× usual Jastrzębie Zdrój, 21 April: 38.4 µg/m³, 2.4× usual Jastrzębie Zdrój, 22 April: 28.9 µg/m³, 1.8× usual Jastrzębie Zdrój, 23 April: 21.1 µg/m³, 1.3× usual Jastrzębie Zdrój, 24 April: 17.3 µg/m³, 1.1× usual Jastrzębie Zdrój, 25 April: 12.0 µg/m³, 0.8× usual Havířov Havířov, 17 April: 28.2 µg/m³, 2.1× usual Havířov, 18 April: 12.3 µg/m³, 0.9× usual Havířov, 19 April: 19.5 µg/m³, 1.5× usual Havířov, 20 April: 26.6 µg/m³, 2.0× usual Havířov, 21 April: 26.3 µg/m³, 2.0× usual Havířov, 22 April: 25.9 µg/m³, 1.9× usual Havířov, 23 April: 18.0 µg/m³, 1.4× usual Havířov, 24 April: 18.7 µg/m³, 1.4× usual Havířov, 25 April: 11.4 µg/m³, 0.9× usual Racibórz Racibórz, 17 April: 25.4 µg/m³, 2.1× usual Racibórz, 18 April: no reading Racibórz, 19 April: 24.1 µg/m³, 2.0× usual Racibórz, 20 April: 31.6 µg/m³, 2.6× usual Racibórz, 21 April: 32.6 µg/m³, 2.7× usual Racibórz, 22 April: 33.9 µg/m³, 2.8× usual Racibórz, 23 April: 25.1 µg/m³, 2.1× usual Racibórz, 24 April: 23.5 µg/m³, 1.9× usual Racibórz, 25 April: 9.2 µg/m³, 0.8× usual Jelenia Góra Jelenia Góra, 17 April: 20.4 µg/m³, 1.9× usual Jelenia Góra, 18 April: no reading Jelenia Góra, 19 April: 11.8 µg/m³, 1.1× usual Jelenia Góra, 20 April: 29.4 µg/m³, 2.7× usual Jelenia Góra, 21 April: 30.1 µg/m³, 2.7× usual Jelenia Góra, 22 April: 26.5 µg/m³, 2.4× usual Jelenia Góra, 23 April: 13.8 µg/m³, 1.3× usual Jelenia Góra, 24 April: 12.2 µg/m³, 1.1× usual Jelenia Góra, 25 April: 8.5 µg/m³, 0.8× usual Czechowice-Dziedzice Czechowice-Dziedzice, 17 April: 22.8 µg/m³, 1.9× usual Czechowice-Dziedzice, 18 April: no reading Czechowice-Dziedzice, 19 April: 19.7 µg/m³, 1.7× usual Czechowice-Dziedzice, 20 April: 25.2 µg/m³, 2.1× usual Czechowice-Dziedzice, 21 April: 31.8 µg/m³, 2.7× usual Czechowice-Dziedzice, 22 April: 37.4 µg/m³, 3.2× usual Czechowice-Dziedzice, 23 April: 21.6 µg/m³, 1.8× usual Czechowice-Dziedzice, 24 April: 17.6 µg/m³, 1.5× usual Czechowice-Dziedzice, 25 April: 9.0 µg/m³, 0.8× usual Kościan Kościan, 17 April: 17.6 µg/m³, 1.5× usual Kościan, 18 April: no reading Kościan, 19 April: 16.5 µg/m³, 1.4× usual Kościan, 20 April: 25.0 µg/m³, 2.1× usual Kościan, 21 April: 21.6 µg/m³, 1.8× usual Kościan, 22 April: 21.4 µg/m³, 1.8× usual Kościan, 23 April: 19.9 µg/m³, 1.6× usual Kościan, 24 April: 13.7 µg/m³, 1.1× usual Kościan, 25 April: 10.9 µg/m³, 0.9× usual Kłodzko Kłodzko, 17 April: 18.8 µg/m³, 1.6× usual Kłodzko, 18 April: no reading Kłodzko, 19 April: 15.8 µg/m³, 1.4× usual Kłodzko, 20 April: 24.8 µg/m³, 2.2× usual Kłodzko, 21 April: 26.6 µg/m³, 2.3× usual Kłodzko, 22 April: 26.7 µg/m³, 2.3× usual Kłodzko, 23 April: 18.3 µg/m³, 1.6× usual Kłodzko, 24 April: 15.6 µg/m³, 1.4× usual Kłodzko, 25 April: 9.8 µg/m³, 0.9× usual Bohumín Bohumín, 17 April: 22.4 µg/m³, 1.8× usual Bohumín, 18 April: 8.2 µg/m³, 0.7× usual Bohumín, 19 April: 17.8 µg/m³, 1.4× usual Bohumín, 20 April: 21.5 µg/m³, 1.7× usual Bohumín, 21 April: 25.9 µg/m³, 2.1× usual Bohumín, 22 April: 30.0 µg/m³, 2.4× usual Bohumín, 23 April: 24.7 µg/m³, 2.0× usual Bohumín, 24 April: 19.6 µg/m³, 1.6× usual Bohumín, 25 April: 6.1 µg/m³, 0.5× usual Ostrava Ostrava, 17 April: 23.9 µg/m³, 2.1× usual Ostrava, 18 April: 11.5 µg/m³, 1.0× usual Ostrava, 19 April: 16.9 µg/m³, 1.5× usual Ostrava, 20 April: 24.7 µg/m³, 2.1× usual Ostrava, 21 April: 25.2 µg/m³, 2.2× usual Ostrava, 22 April: 25.4 µg/m³, 2.2× usual Ostrava, 23 April: 18.7 µg/m³, 1.6× usual Ostrava, 24 April: 17.2 µg/m³, 1.5× usual Ostrava, 25 April: 8.6 µg/m³, 0.7× usual Radomsko Radomsko, 17 April: no reading Radomsko, 18 April: no reading Radomsko, 19 April: no reading Radomsko, 20 April: no reading Radomsko, 21 April: no reading Radomsko, 22 April: 34.8 µg/m³, 2.7× usual Radomsko, 23 April: no reading Radomsko, 24 April: 16.9 µg/m³, 1.3× usual Radomsko, 25 April: 9.1 µg/m³, 0.7× usual Otwock Otwock, 17 April: 13.5 µg/m³, 1.0× usual Otwock, 18 April: no reading Otwock, 19 April: 15.0 µg/m³, 1.2× usual Otwock, 20 April: 14.8 µg/m³, 1.1× usual Otwock, 21 April: 17.7 µg/m³, 1.4× usual Otwock, 22 April: 29.4 µg/m³, 2.3× usual Otwock, 23 April: 10.8 µg/m³, 0.8× usual Otwock, 24 April: 12.8 µg/m³, 1.0× usual Otwock, 25 April: 17.8 µg/m³, 1.4× usual Łask Łask, 17 April: 23.2 µg/m³, 1.7× usual Łask, 18 April: no reading Łask, 19 April: 17.7 µg/m³, 1.3× usual Łask, 20 April: 26.7 µg/m³, 1.9× usual Łask, 21 April: 22.6 µg/m³, 1.6× usual Łask, 22 April: 28.2 µg/m³, 2.1× usual Łask, 23 April: 19.0 µg/m³, 1.4× usual Łask, 24 April: 17.1 µg/m³, 1.2× usual Łask, 25 April: 9.5 µg/m³, 0.7× usual Nisko Nisko, 17 April: 9.9 µg/m³, 0.9× usual Nisko, 18 April: no reading Nisko, 19 April: 12.5 µg/m³, 1.1× usual Nisko, 20 April: 12.8 µg/m³, 1.2× usual Nisko, 21 April: 15.6 µg/m³, 1.4× usual Nisko, 22 April: 26.5 µg/m³, 2.4× usual Nisko, 23 April: 18.8 µg/m³, 1.7× usual Nisko, 24 April: 13.6 µg/m³, 1.2× usual Nisko, 25 April: 12.3 µg/m³, 1.1× usual Karviná Karviná, 17 April: no reading Karviná, 18 April: no reading Karviná, 19 April: no reading Karviná, 20 April: no reading Karviná, 21 April: no reading Karviná, 22 April: 26.1 µg/m³, 2.5× usual Karviná, 23 April: no reading Karviná, 24 April: 15.1 µg/m³, 1.4× usual Karviná, 25 April: 8.3 µg/m³, 0.8× usual Děčín Děčín, 17 April: 11.3 µg/m³, 0.9× usual Děčín, 18 April: 13.2 µg/m³, 1.1× usual Děčín, 19 April: 11.4 µg/m³, 0.9× usual Děčín, 20 April: 13.6 µg/m³, 1.1× usual Děčín, 21 April: 22.2 µg/m³, 1.8× usual Děčín, 22 April: 25.7 µg/m³, 2.1× usual Děčín, 23 April: 18.4 µg/m³, 1.5× usual Děčín, 24 April: 13.1 µg/m³, 1.1× usual Děčín, 25 April: 9.6 µg/m³, 0.8× usual 17 Apr 18 19 20 21 22 23 24 25 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
Czechowice-Dziedzice Silesia, Poland 3 22 April 11.8 3.2× Racibórz Silesia, Poland 3 22 April 12.2 2.8× Radomsko Łódź Voivodeship, Poland 1 22 April 12.7 2.7× Jelenia Góra Lower Silesia, Poland 3 21 April 11.0 2.7× Karviná Moravian-Silesian Region, Czechia 1 22 April 10.6 2.5× Jastrzębie Zdrój Silesia, Poland 2 21 April 16.0 2.4× Bohumín Moravian-Silesian Region, Czechia 2 22 April 12.5 2.4× Nisko Subcarpathia, Poland 1 22 April 11.1 2.4× Kłodzko Lower Silesia, Poland 2 22 April 11.5 2.3× Otwock Mazovia, Poland 1 22 April 13.0 2.3× Ostrava Moravian-Silesian Region, Czechia 2 22 April 11.6 2.2× Havířov Moravian-Silesian Region, Czechia 1 17 April 13.3 2.1× Děčín Ústí nad Labem Region, Czechia 1 22 April 12.3 2.1× Kościan Greater Poland, Poland 1 20 April 12.1 2.1× Łask Łódź Voivodeship, Poland 1 22 April 13.7 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 Poland and Czechia
Number 7 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, April 2023: 15 cities with PM2.5 at twice their usual or more, 20 to 22 April 2023, smogrank.com/episodes/2023-04-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.
