SmogRank / Episodes / Poland
Eastern Europe, April 2023
For 3 days, from 20 to 22 April 2023, 23 cities in Poland, Czechia, Serbia and 2 more countries 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. Ended 22 April.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 23 in 5 countries
Days 3 20 to 22 April 2023
Worst day 22 April 13 cities counted
Furthest above usual 4.0× Pristina
Day by day
Play 22 April 13 cities at twice their usual or more
Komárno Esztergom Veszprém Dunaújváros Győr Gyál Nitra Sereď Partizánske Trnava Žiar nad Hronom Senec Pécs Handlová Prievidza Zvolen Pezinok Bratislava Banská Bystrica Trenčín Lučenec Devínska Nová Ves Senica Liberpolis Malacky Púchov Martin Žilina Ružomberok Hodonín Zlín Koprivnica Groß-Enzersdorf Čadca Szeged Liptovský Mikuláš Valašské Meziříčí Revúca Kroměříž Vienna Mödling Baden Perchtoldsdorf Hranice Mikulov Bad Vöslau Klosterneuburg Přerov Frýdek-Místek Třinec Studénka Český Těšín Cieszyn Kazincbarcika Slatina Olomouc Bielsko-Biala Židenice Futog Tulln Poprad Brno Opava Veľká Lomnica Smižany Spišská Nová Ves Ptuj Znojmo Weiz Banja Luka Maribor Sankt Pölten Leibnitz Moravská Třebová Katowice Šabac Kędzierzyn-Koźle Graz Kraków Krapkowice Košice Surčin Zemun Prešov Nysa Voitsberg Obrenovac Belgrade Opole Celje Sremčica Pančevo Vinča Bardejov Jihlava Valjevo Ripanj Lazarevac Trebišov Trbovlje Wolfsberg Novo Mesto Amstetten Vranov nad Topľou Tarnów Smederevo Pardubice Włoszczowa Hradec Králové Humenné Jasło Wrocław Sankt Valentin Čačak Dębica Steyr Snina Krosno Mostar Ljubljana Kielce Klagenfurt am Wörthersee Mielec Ansfelden Kranj Kragujevac Linz České Budějovice Traun Kalisz Wels Rijeka Rzeszów Łódź Starachowice Ćuprija Zgierz Mladá Boleslav Trebinje Attnang-Puchheim Novi Pazar Liberec Prague Radom Bogatynia Kutno Bor Przemyśl Jarosław Koper Beroun Żyrardów Pejë Kladno Passau Mitrovicë Poznań Cluj-Napoca Włocławek Płock Pruszków Żary Niš Zielona Góra Konstancin-Jeziorna Kosovo Polje Ústí nad Labem Warsaw Pilsen Wawer Saalfelden am Steinernen Meer Legionowo Teplice Burghausen Prizren Lublin Most Litvínov Międzyrzecz Gjilan Traunreut Trostberg an der Alz Zamość Kadaň Pułtusk Tetovo Cottbus Łuków Eisenhüttenstadt Siedlce Ancona Skopje Porto Potenza Picena Civitanova Marche Craiova Gorzów Wielkopolski Falconara Marittima Ilinden Frankfurt (Oder) Lubnjow Chiaravalle Sokolov Jesi Pesaro Kochani Sofia Königs Wusterhausen Strausberg Schöneiche Altenburg Neuenhagen Botevgrad Blankenfelde-Mahlow Luckenwalde Mahlow Eberswalde Bernau bei Berlin Berlin Teltow Kleinmachnow Wittenberg Potsdam Falkensee Dallgow-Döberitz Nauen Brandenburg an der Havel Havířov Kościan Děčín Łask Ostrava Pirot Čaňa Novi Sad Otwock Lwówek Śląski Nisko Wodzisław Śląski Bohumín Jastrzębie Zdrój Karviná Kłodzko Jelenia Góra Radomsko Wschowa Racibórz Czechowice-Dziedzice Kolárovo Pristina 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 Jastrzębie Zdrój, 18 April: no reading Jastrzębie Zdrój, 19 April: 29.3 µg/m³ Jastrzębie Zdrój, 20 April: 36.7 µg/m³, 2.3× its usual 16.0 Jastrzębie Zdrój, 21 April: 38.4 µg/m³, 2.4× its usual 16.0 Jastrzębie Zdrój, 22 April: 28.9 µg/m³ Jastrzębie Zdrój, 23 April: 21.1 µg/m³ Jastrzębie Zdrój, 24 April: 17.3 µg/m³ Jastrzębie Zdrój, 25 April: 12.0 µg/m³ Pirot Pirot, 17 April: 19.9 µg/m³ Pirot, 18 April: no reading Pirot, 19 April: 39.9 µg/m³ Pirot, 20 April: 36.2 µg/m³, 2.2× its usual 16.2 Pirot, 21 April: 31.2 µg/m³ Pirot, 22 April: no reading Pirot, 23 April: 17.0 µg/m³ Pirot, 24 April: no reading Pirot, 25 April: no reading Lwówek Śląski Lwówek Śląski, 17 April: 22.5 µg/m³ Lwówek Śląski, 18 April: no reading Lwówek Śląski, 19 April: 15.2 µg/m³ Lwówek Śląski, 20 April: 35.7 µg/m³, 2.2× its usual 16.0 Lwówek Śląski, 21 April: 36.4 µg/m³, 2.3× its usual 16.0 Lwówek Śląski, 22 April: no reading Lwówek Śląski, 23 April: 21.3 µg/m³ Lwówek Śląski, 24 April: 13.8 µg/m³ Lwówek Śląski, 25 April: no reading Pristina Pristina, 17 April: 23.6 µg/m³ Pristina, 18 April: 21.4 µg/m³ Pristina, 19 April: 30.0 µg/m³ Pristina, 20 April: 34.8 µg/m³, 4.0× its usual 8.6 Pristina, 21 April: 36.0 µg/m³ Pristina, 22 April: no reading Pristina, 23 April: 30.3 µg/m³ Pristina, 24 April: 29.8 µg/m³ Pristina, 25 April: 3.6 µg/m³ Wschowa Wschowa, 17 April: 23.7 µg/m³ Wschowa, 18 April: no reading Wschowa, 19 April: 23.5 µg/m³ Wschowa, 20 April: 33.6 µg/m³, 2.8× its usual 11.8 Wschowa, 21 April: 21.9 µg/m³ Wschowa, 22 April: no reading Wschowa, 23 April: 16.9 µg/m³ Wschowa, 24 April: 9.5 µg/m³ Wschowa, 25 April: no reading Racibórz Racibórz, 17 April: 25.4 µg/m³ Racibórz, 18 April: no reading Racibórz, 19 April: 24.1 µg/m³ Racibórz, 20 April: 31.6 µg/m³, 2.4× its usual 13.0 Racibórz, 21 April: 32.6 µg/m³, 2.6× its usual 12.6 Racibórz, 22 April: 33.9 µg/m³, 2.8× its usual 12.2 Racibórz, 23 April: 25.1 µg/m³ Racibórz, 24 April: 23.5 µg/m³ Racibórz, 25 April: 9.2 µg/m³ Jelenia Góra Jelenia Góra, 17 April: 20.4 µg/m³ Jelenia Góra, 18 April: no reading Jelenia Góra, 19 April: 11.8 µg/m³ Jelenia Góra, 20 April: 29.4 µg/m³, 2.7× its usual 11.0 Jelenia Góra, 21 April: 30.1 µg/m³, 2.7× its usual 11.0 Jelenia Góra, 22 April: 26.5 µg/m³, 2.4× its usual 11.0 Jelenia Góra, 23 April: 13.8 µg/m³ Jelenia Góra, 24 April: 12.2 µg/m³ Jelenia Góra, 25 April: 8.5 µg/m³ Kolárovo Kolárovo, 17 April: 22.7 µg/m³ Kolárovo, 18 April: 18.1 µg/m³ Kolárovo, 19 April: 22.2 µg/m³ Kolárovo, 20 April: 28.4 µg/m³, 3.5× its usual 8.1 Kolárovo, 21 April: no reading Kolárovo, 22 April: no reading Kolárovo, 23 April: no reading Kolárovo, 24 April: no reading Kolárovo, 25 April: no reading Havířov Havířov, 17 April: 28.2 µg/m³ Havířov, 18 April: 12.3 µg/m³ Havířov, 19 April: 19.5 µg/m³ Havířov, 20 April: 26.6 µg/m³, 2.0× its usual 13.3 Havířov, 21 April: 26.3 µg/m³ Havířov, 22 April: 25.9 µg/m³ Havířov, 23 April: 18.0 µg/m³ Havířov, 24 April: 18.7 µg/m³ Havířov, 25 April: 11.4 µg/m³ Czechowice-Dziedzice Czechowice-Dziedzice, 17 April: 22.8 µg/m³ Czechowice-Dziedzice, 18 April: no reading Czechowice-Dziedzice, 19 April: 19.7 µg/m³ Czechowice-Dziedzice, 20 April: 25.2 µg/m³, 2.0× its usual 12.5 Czechowice-Dziedzice, 21 April: 31.8 µg/m³, 2.6× its usual 12.3 Czechowice-Dziedzice, 22 April: 37.4 µg/m³, 3.2× its usual 11.8 Czechowice-Dziedzice, 23 April: 21.6 µg/m³ Czechowice-Dziedzice, 24 April: 17.6 µg/m³ Czechowice-Dziedzice, 25 April: 9.0 µg/m³ Novi Sad Novi Sad, 17 April: 13.8 µg/m³ Novi Sad, 18 April: no reading Novi Sad, 19 April: 18.3 µg/m³ Novi Sad, 20 April: 25.1 µg/m³, 2.3× its usual 10.8 Novi Sad, 21 April: 22.1 µg/m³ Novi Sad, 22 April: no reading Novi Sad, 23 April: 19.7 µg/m³ Novi Sad, 24 April: no reading Novi Sad, 25 April: no reading Kościan Kościan, 17 April: 17.6 µg/m³ Kościan, 18 April: no reading Kościan, 19 April: 16.5 µg/m³ Kościan, 20 April: 25.0 µg/m³, 2.1× its usual 12.1 Kościan, 21 April: 21.6 µg/m³ Kościan, 22 April: 21.4 µg/m³ Kościan, 23 April: 19.9 µg/m³ Kościan, 24 April: 13.7 µg/m³ Kościan, 25 April: 10.9 µg/m³ Čaňa Čaňa, 17 April: 25.2 µg/m³ Čaňa, 18 April: 26.7 µg/m³ Čaňa, 19 April: 29.0 µg/m³ Čaňa, 20 April: 27.9 µg/m³ Čaňa, 21 April: 38.0 µg/m³, 2.2× its usual 17.6 Čaňa, 22 April: no reading Čaňa, 23 April: 24.2 µg/m³ Čaňa, 24 April: no reading Čaňa, 25 April: no reading Kłodzko Kłodzko, 17 April: 21.8 µg/m³ Kłodzko, 18 April: no reading Kłodzko, 19 April: 16.9 µg/m³ Kłodzko, 20 April: 24.7 µg/m³ Kłodzko, 21 April: 28.6 µg/m³, 2.5× its usual 11.5 Kłodzko, 22 April: 26.7 µg/m³, 2.3× its usual 11.5 Kłodzko, 23 April: 21.0 µg/m³ Kłodzko, 24 April: 18.6 µg/m³ Kłodzko, 25 April: 9.8 µg/m³ Bohumín Bohumín, 17 April: 22.4 µg/m³ Bohumín, 18 April: 8.2 µg/m³ Bohumín, 19 April: 17.8 µg/m³ Bohumín, 20 April: 21.5 µg/m³ Bohumín, 21 April: 25.9 µg/m³, 2.1× its usual 12.3 Bohumín, 22 April: 30.0 µg/m³, 2.4× its usual 12.5 Bohumín, 23 April: 24.7 µg/m³ Bohumín, 24 April: 19.6 µg/m³ Bohumín, 25 April: 6.1 µg/m³ Wodzisław Śląski Wodzisław Śląski, 17 April: 22.4 µg/m³ Wodzisław Śląski, 18 April: 8.2 µg/m³ Wodzisław Śląski, 19 April: 17.8 µg/m³ Wodzisław Śląski, 20 April: 21.5 µg/m³ Wodzisław Śląski, 21 April: 25.9 µg/m³, 2.1× its usual 12.3 Wodzisław Śląski, 22 April: 30.0 µg/m³, 2.4× its usual 12.5 Wodzisław Śląski, 23 April: 24.7 µg/m³ Wodzisław Śląski, 24 April: 19.6 µg/m³ Wodzisław Śląski, 25 April: 6.1 µg/m³ Ostrava Ostrava, 17 April: 23.9 µg/m³ Ostrava, 18 April: 11.5 µg/m³ Ostrava, 19 April: 16.9 µg/m³ Ostrava, 20 April: 24.7 µg/m³ Ostrava, 21 April: 25.2 µg/m³, 2.2× its usual 11.5 Ostrava, 22 April: 25.4 µg/m³, 2.2× its usual 11.6 Ostrava, 23 April: 18.7 µg/m³ Ostrava, 24 April: 17.2 µg/m³ Ostrava, 25 April: 8.6 µg/m³ 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× its usual 12.7 Radomsko, 23 April: no reading Radomsko, 24 April: 16.9 µg/m³ Radomsko, 25 April: 9.1 µg/m³ Otwock Otwock, 17 April: 13.5 µg/m³ Otwock, 18 April: no reading Otwock, 19 April: 15.0 µg/m³ Otwock, 20 April: 14.8 µg/m³ Otwock, 21 April: 17.7 µg/m³ Otwock, 22 April: 29.4 µg/m³, 2.3× its usual 13.0 Otwock, 23 April: 10.8 µg/m³ Otwock, 24 April: 12.8 µg/m³ Otwock, 25 April: 17.8 µg/m³ Łask Łask, 17 April: 23.2 µg/m³ Łask, 18 April: no reading Łask, 19 April: 17.7 µg/m³ Łask, 20 April: 26.7 µg/m³ Łask, 21 April: 22.6 µg/m³ Łask, 22 April: 28.2 µg/m³, 2.1× its usual 13.7 Łask, 23 April: 19.0 µg/m³ Łask, 24 April: 17.1 µg/m³ Łask, 25 April: 9.5 µg/m³ Nisko Nisko, 17 April: 9.9 µg/m³ Nisko, 18 April: no reading Nisko, 19 April: 12.5 µg/m³ Nisko, 20 April: 12.8 µg/m³ Nisko, 21 April: 15.6 µg/m³ Nisko, 22 April: 26.5 µg/m³, 2.4× its usual 11.1 Nisko, 23 April: 18.8 µg/m³ Nisko, 24 April: 13.6 µg/m³ Nisko, 25 April: 12.3 µg/m³ 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× its usual 10.6 Karviná, 23 April: no reading Karviná, 24 April: 15.1 µg/m³ Karviná, 25 April: 8.3 µg/m³ Děčín Děčín, 17 April: 11.3 µg/m³ Děčín, 18 April: 13.2 µg/m³ Děčín, 19 April: 11.4 µg/m³ Děčín, 20 April: 13.6 µg/m³ Děčín, 21 April: 22.2 µg/m³ Děčín, 22 April: 25.7 µg/m³, 2.1× its usual 12.3 Děčín, 23 April: 18.4 µg/m³ Děčín, 24 April: 13.1 µg/m³ Děčín, 25 April: 9.6 µg/m³ 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
Pristina Pristina, Kosovo 1 20 April 8.6 4.0× Kolárovo Nitra Region, Slovakia 1 20 April 8.1 3.5× Czechowice-Dziedzice Silesia, Poland 3 22 April 11.8 3.2× Racibórz Silesia, Poland 3 22 April 12.2 2.8× Wschowa Lubusz, Poland 1 20 April 11.8 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× Kłodzko Lower Silesia, Poland 2 21 April 11.5 2.5× 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× Wodzisław Śląski Silesia, Poland 2 22 April 12.5 2.4× Nisko Subcarpathia, Poland 1 22 April 11.1 2.4× Lwówek Śląski Lower Silesia, Poland 2 21 April 16.0 2.3× Otwock Mazovia, Poland 1 22 April 13.0 2.3× Novi Sad Vojvodina, Serbia 1 20 April 10.8 2.3× Čaňa Košice Region, Slovakia 1 21 April 17.6 2.2× Pirot Central Serbia, Serbia 1 20 April 16.2 2.2× Ostrava Moravian-Silesian Region, Czechia 2 22 April 11.6 2.2× Łask Łódź Voivodeship, Poland 1 22 April 13.7 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× Havířov Moravian-Silesian Region, Czechia 1 20 April 13.3 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 Poland and Czechia
Number 24 of 46 episodes in Poland and Czechia since our records began, by cities reached.
Eastern Europe, October and November 2024 161 Europe, December 2023 134 Eastern Europe, 16 to 21 December 2025 129 Eastern Europe, January 2026 86 Europe, 8 to 10 November 2025 84 Germany, Poland and Czechia, February 2026 67 Eastern Europe, 3 to 7 December 2025 64 Europe, 17 to 22 March 2023 64 Eastern Europe, 30 November to 8 December 2024 61 Eastern and northern Europe, September 2023 58 Europe, 28 to 31 January 2024 53 Poland, September 2024 52 Eastern Europe, April 2023 23 Bars: cities reached; colour: the level of the episode's highest daily reading. All 46 .
Use this page SmogRank, Eastern Europe, April 2023: 23 cities with PM2.5 at twice their usual or more, 20 to 22 April 2023, smogrank.com/episodes/2023-04-eastern-europe (accessed 5 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.
