SmogRank / Episodes / Slovakia
Eastern Europe, 15 to 17 April 2026
For 3 days, from 15 to 17 April 2026, 25 cities in Slovakia, Hungary, Czechia and 5 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Szeged, Csongrád, Hungary: 43.9 µg/m³ on 16 April, about 4.9× its usual 8.9. Ended 17 April.
Likely smoke from fires Fires were detected within 300 km of the city on 40% of the counted city-days. Satellites see crop, field and forest fires alike, so this doesn't say which burned.
Cities reached 25 in 8 countries
Days 3 15 to 17 April 2026
Worst day 16 April 23 cities counted
Furthest above usual 5.8× Baden
Day by day
Play 16 April 23 cities at twice their usual or more
Gyál Budapest Gyöngyös Dunaújváros Šahy Lučenec Zvolen Hnúšťa Žarnovica Žiar nad Hronom Banská Bystrica Revúca Kazincbarcika Handlová Miskolc Veszprém Kolárovo Prievidza Partizánske Nitra Liptovský Mikuláš Martin Pécs Kikinda Sereď Veľká Lomnica Trenčín Trnava Krompachy Oščadnica Novi Sad Čadca Senec Čaňa Košice Żywiec Nyíregyháza Pezinok Chorvátsky Grob - Čierna Voda Timişoara Třinec Bratislava Bielsko-Biala Český Těšín Cieszyn Frýdek-Místek Czechowice-Dziedzice Devínska Nová Ves Havířov Hainburg an der Donau Karviná Studénka Ostrava Jastrzębie Zdrój Kraków Hodonín Bohumín Hranice Belgrade Wodzisław Śląski Přerov Katowice Eisenstadt Racibórz Groß-Enzersdorf Tarnów Smederevo Olomouc Jasło Mikulov Snina Vienna Eisenzicken Kędzierzyn-Koźle Mödling Wiener Neustadt Klosterneuburg Perchtoldsdorf Krosno Slatina Dębica Židenice Murska Sobota Brno Fürstenfeld Tulln Mielec Połaniec Travnik Zalău Moravská Třebová Ptuj Znojmo Rzeszów Weiz Maribor Sankt Pölten Leibnitz Graz Przemyśl Deuchendorf Žďár nad Sázavou Kłodzko Nisko Bruck an der Mur Jarosław Cluj-Napoca Szczytna Voitsberg Celje Leoben Jihlava Dej Rovinari Sighetu Marmaţiei Târgu Jiu Pardubice Novo Mesto Trbovlje Hradec Králové Zagorje ob Savi Knittelfeld Wolfsberg Amstetten Kostel Sankt Valentin Enns Steyr Ljubljana Klagenfurt am Wörthersee Kranj Liezen Ansfelden České Budějovice Linz Traun Craiova Mladá Boleslav Wels Attnang-Puchheim Beroun Nova Gorica Piteşti Gorizia Koper Kladno Codlea Rokycany Humenné Banja Luka Debrecen Prešov Trebišov Ružomberok Bardejov Obrenovac Târgu Mureş Poprad Vranov nad Topľou Žilina Esztergom Komárno Malacky Senica Baia Mare Púchov Stodůlky Győr Zagreb Prague Říčany Szeged Baden 12 Apr 13 14 15 16 17 18 19 20 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
Zagreb Zagreb, 12 April: 18.0 µg/m³ Zagreb, 13 April: 18.7 µg/m³ Zagreb, 14 April: 27.0 µg/m³ Zagreb, 15 April: 39.5 µg/m³, 3.1× its usual 12.8 Zagreb, 16 April: 37.8 µg/m³, 3.0× its usual 12.5 Zagreb, 17 April: 23.4 µg/m³ Zagreb, 18 April: 19.0 µg/m³ Zagreb, 19 April: 17.2 µg/m³ Zagreb, 20 April: 11.3 µg/m³ Stodůlky Stodůlky, 12 April: 41.1 µg/m³ Stodůlky, 13 April: 24.7 µg/m³ Stodůlky, 14 April: 29.6 µg/m³ Stodůlky, 15 April: 37.3 µg/m³, 2.9× its usual 13.0 Stodůlky, 16 April: 28.4 µg/m³, 2.3× its usual 12.1 Stodůlky, 17 April: 15.0 µg/m³ Stodůlky, 18 April: 20.5 µg/m³ Stodůlky, 19 April: 11.5 µg/m³ Stodůlky, 20 April: 0.5 µg/m³ Říčany Říčany, 12 April: 42.4 µg/m³ Říčany, 13 April: 25.4 µg/m³ Říčany, 14 April: 25.4 µg/m³ Říčany, 15 April: 36.8 µg/m³, 4.1× its usual 8.9 Říčany, 16 April: 33.0 µg/m³, 3.8× its usual 8.6 Říčany, 17 April: 17.5 µg/m³ Říčany, 18 April: 20.4 µg/m³ Říčany, 19 April: 13.3 µg/m³ Říčany, 20 April: 1.8 µg/m³ Púchov Púchov, 12 April: 20.9 µg/m³ Púchov, 13 April: 15.7 µg/m³ Púchov, 14 April: 16.9 µg/m³ Púchov, 15 April: 33.9 µg/m³, 2.8× its usual 12.2 Púchov, 16 April: 35.6 µg/m³, 2.9× its usual 12.2 Púchov, 17 April: 24.1 µg/m³ Púchov, 18 April: 17.7 µg/m³ Púchov, 19 April: 19.4 µg/m³ Púchov, 20 April: 13.6 µg/m³ Baden Baden, 12 April: 23.4 µg/m³ Baden, 13 April: 11.9 µg/m³ Baden, 14 April: 24.5 µg/m³ Baden, 15 April: 25.0 µg/m³, 5.0× its usual 3.2 Baden, 16 April: 29.0 µg/m³, 5.8× its usual 3.2 Baden, 17 April: 17.8 µg/m³ Baden, 18 April: 9.9 µg/m³ Baden, 19 April: 10.4 µg/m³ Baden, 20 April: 0.0 µg/m³ Szeged Szeged, 12 April: 12.3 µg/m³ Szeged, 13 April: 12.5 µg/m³ Szeged, 14 April: 10.7 µg/m³ Szeged, 15 April: 10.3 µg/m³ Szeged, 16 April: 43.9 µg/m³, 4.9× its usual 8.9 Szeged, 17 April: 14.0 µg/m³ Szeged, 18 April: 9.2 µg/m³ Szeged, 19 April: 7.4 µg/m³ Szeged, 20 April: 6.5 µg/m³ Obrenovac Obrenovac, 12 April: 22.9 µg/m³ Obrenovac, 13 April: 16.1 µg/m³ Obrenovac, 14 April: 13.7 µg/m³ Obrenovac, 15 April: 19.2 µg/m³ Obrenovac, 16 April: 32.9 µg/m³, 2.3× its usual 14.5 Obrenovac, 17 April: 31.2 µg/m³, 2.1× its usual 14.6 Obrenovac, 18 April: 26.5 µg/m³ Obrenovac, 19 April: 20.4 µg/m³ Obrenovac, 20 April: 18.1 µg/m³ Prague Prague, 12 April: 23.0 µg/m³ Prague, 13 April: 16.7 µg/m³ Prague, 14 April: 21.8 µg/m³ Prague, 15 April: no reading Prague, 16 April: 32.8 µg/m³, 3.3× its usual 9.8 Prague, 17 April: no reading Prague, 18 April: 15.2 µg/m³ Prague, 19 April: 11.8 µg/m³ Prague, 20 April: 3.5 µg/m³ Baia Mare Baia Mare, 12 April: 17.3 µg/m³ Baia Mare, 13 April: 11.8 µg/m³ Baia Mare, 14 April: 10.2 µg/m³ Baia Mare, 15 April: no reading Baia Mare, 16 April: 32.4 µg/m³, 2.9× its usual 11.2 Baia Mare, 17 April: 24.5 µg/m³ Baia Mare, 18 April: 15.3 µg/m³ Baia Mare, 19 April: 15.6 µg/m³ Baia Mare, 20 April: 24.2 µg/m³ Prešov Prešov, 12 April: 17.4 µg/m³ Prešov, 13 April: 14.3 µg/m³ Prešov, 14 April: 21.1 µg/m³ Prešov, 15 April: 18.9 µg/m³ Prešov, 16 April: 30.5 µg/m³, 2.1× its usual 14.5 Prešov, 17 April: 23.9 µg/m³ Prešov, 18 April: 10.7 µg/m³ Prešov, 19 April: 14.7 µg/m³ Prešov, 20 April: 9.8 µg/m³ Žilina Žilina, 12 April: 21.1 µg/m³ Žilina, 13 April: 12.5 µg/m³ Žilina, 14 April: 14.7 µg/m³ Žilina, 15 April: 24.7 µg/m³ Žilina, 16 April: 29.7 µg/m³, 2.6× its usual 11.5 Žilina, 17 April: 13.7 µg/m³ Žilina, 18 April: 15.1 µg/m³ Žilina, 19 April: 13.9 µg/m³ Žilina, 20 April: 4.3 µg/m³ Győr Győr, 12 April: 16.9 µg/m³ Győr, 13 April: 13.6 µg/m³ Győr, 14 April: 16.8 µg/m³ Győr, 15 April: 21.6 µg/m³ Győr, 16 April: 28.9 µg/m³, 3.1× its usual 9.2 Győr, 17 April: 24.0 µg/m³ Győr, 18 April: 11.9 µg/m³ Győr, 19 April: 11.4 µg/m³ Győr, 20 April: 7.9 µg/m³ Vranov nad Topľou Vranov nad Topľou, 12 April: 15.2 µg/m³ Vranov nad Topľou, 13 April: 10.7 µg/m³ Vranov nad Topľou, 14 April: 14.5 µg/m³ Vranov nad Topľou, 15 April: 15.6 µg/m³ Vranov nad Topľou, 16 April: 28.7 µg/m³, 2.5× its usual 11.3 Vranov nad Topľou, 17 April: 20.3 µg/m³ Vranov nad Topľou, 18 April: 8.6 µg/m³ Vranov nad Topľou, 19 April: 12.2 µg/m³ Vranov nad Topľou, 20 April: 8.0 µg/m³ Senica Senica, 12 April: 16.7 µg/m³ Senica, 13 April: 11.5 µg/m³ Senica, 14 April: 12.5 µg/m³ Senica, 15 April: 24.5 µg/m³ Senica, 16 April: 28.4 µg/m³, 2.9× its usual 9.9 Senica, 17 April: 17.4 µg/m³ Senica, 18 April: 13.5 µg/m³ Senica, 19 April: 15.0 µg/m³ Senica, 20 April: no reading Debrecen Debrecen, 12 April: 28.6 µg/m³ Debrecen, 13 April: 20.1 µg/m³ Debrecen, 14 April: 15.1 µg/m³ Debrecen, 15 April: 24.1 µg/m³ Debrecen, 16 April: 28.1 µg/m³, 2.1× its usual 13.6 Debrecen, 17 April: 27.6 µg/m³, 2.1× its usual 13.0 Debrecen, 18 April: 9.5 µg/m³ Debrecen, 19 April: 12.2 µg/m³ Debrecen, 20 April: 10.5 µg/m³ Komárno Komárno, 12 April: 14.8 µg/m³ Komárno, 13 April: 12.0 µg/m³ Komárno, 14 April: 10.5 µg/m³ Komárno, 15 April: 18.6 µg/m³ Komárno, 16 April: 27.3 µg/m³, 2.7× its usual 10.2 Komárno, 17 April: 20.3 µg/m³ Komárno, 18 April: 12.8 µg/m³ Komárno, 19 April: 14.3 µg/m³ Komárno, 20 April: 6.5 µg/m³ Poprad Poprad, 12 April: 17.5 µg/m³ Poprad, 13 April: 11.2 µg/m³ Poprad, 14 April: 12.2 µg/m³ Poprad, 15 April: 15.1 µg/m³ Poprad, 16 April: 26.1 µg/m³, 2.5× its usual 10.3 Poprad, 17 April: 17.3 µg/m³ Poprad, 18 April: 9.4 µg/m³ Poprad, 19 April: 10.4 µg/m³ Poprad, 20 April: 7.5 µg/m³ Humenné Humenné, 12 April: 16.8 µg/m³ Humenné, 13 April: 11.8 µg/m³ Humenné, 14 April: 17.0 µg/m³ Humenné, 15 April: 17.9 µg/m³ Humenné, 16 April: 26.1 µg/m³, 2.0× its usual 12.8 Humenné, 17 April: 21.8 µg/m³ Humenné, 18 April: 10.7 µg/m³ Humenné, 19 April: 14.1 µg/m³ Humenné, 20 April: 8.6 µg/m³ Esztergom Esztergom, 12 April: 14.7 µg/m³ Esztergom, 13 April: 12.6 µg/m³ Esztergom, 14 April: 13.0 µg/m³ Esztergom, 15 April: 17.0 µg/m³ Esztergom, 16 April: 26.0 µg/m³, 2.7× its usual 9.7 Esztergom, 17 April: 17.8 µg/m³ Esztergom, 18 April: 11.5 µg/m³ Esztergom, 19 April: 16.1 µg/m³ Esztergom, 20 April: 9.4 µg/m³ Bardejov Bardejov, 12 April: 13.1 µg/m³ Bardejov, 13 April: 9.5 µg/m³ Bardejov, 14 April: 14.1 µg/m³ Bardejov, 15 April: 15.0 µg/m³ Bardejov, 16 April: 25.8 µg/m³, 2.3× its usual 11.1 Bardejov, 17 April: 21.1 µg/m³ Bardejov, 18 April: 14.4 µg/m³ Bardejov, 19 April: 11.3 µg/m³ Bardejov, 20 April: 9.6 µg/m³ Trebišov Trebišov, 12 April: 16.4 µg/m³ Trebišov, 13 April: 11.5 µg/m³ Trebišov, 14 April: 14.6 µg/m³ Trebišov, 15 April: 16.5 µg/m³ Trebišov, 16 April: 25.8 µg/m³, 2.2× its usual 11.7 Trebišov, 17 April: 21.7 µg/m³ Trebišov, 18 April: 9.5 µg/m³ Trebišov, 19 April: 12.9 µg/m³ Trebišov, 20 April: 8.7 µg/m³ Ružomberok Ružomberok, 12 April: 19.3 µg/m³ Ružomberok, 13 April: 14.0 µg/m³ Ružomberok, 14 April: 14.2 µg/m³ Ružomberok, 15 April: 17.5 µg/m³ Ružomberok, 16 April: 25.7 µg/m³, 2.3× its usual 11.2 Ružomberok, 17 April: 20.5 µg/m³ Ružomberok, 18 April: 12.9 µg/m³ Ružomberok, 19 April: 16.5 µg/m³ Ružomberok, 20 April: 12.6 µg/m³ Malacky Malacky, 12 April: no reading Malacky, 13 April: 14.7 µg/m³ Malacky, 14 April: 13.2 µg/m³ Malacky, 15 April: 22.5 µg/m³ Malacky, 16 April: 25.0 µg/m³, 2.8× its usual 9.0 Malacky, 17 April: 17.6 µg/m³ Malacky, 18 April: 11.1 µg/m³ Malacky, 19 April: 13.1 µg/m³ Malacky, 20 April: 5.1 µg/m³ Târgu Mureş Târgu Mureş, 12 April: 37.9 µg/m³ Târgu Mureş, 13 April: 27.2 µg/m³ Târgu Mureş, 14 April: 9.4 µg/m³ Târgu Mureş, 15 April: 25.8 µg/m³ Târgu Mureş, 16 April: 26.8 µg/m³ Târgu Mureş, 17 April: 39.6 µg/m³, 2.3× its usual 17.5 Târgu Mureş, 18 April: 20.6 µg/m³ Târgu Mureş, 19 April: 18.3 µg/m³ Târgu Mureş, 20 April: 24.5 µg/m³ Banja Luka Banja Luka, 12 April: 15.6 µg/m³ Banja Luka, 13 April: 18.6 µg/m³ Banja Luka, 14 April: 28.1 µg/m³ Banja Luka, 15 April: no reading Banja Luka, 16 April: no reading Banja Luka, 17 April: 26.7 µg/m³, 2.0× its usual 13.3 Banja Luka, 18 April: 19.3 µg/m³ Banja Luka, 19 April: 14.6 µg/m³ Banja Luka, 20 April: 9.1 µg/m³ 12 Apr 13 14 15 16 17 18 19 20 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
Baden Lower Austria, Austria 2 16 April 3.2 5.8× Szeged Csongrád, Hungary 1 16 April 8.9 4.9× Říčany Central Bohemia, Czechia 2 15 April 8.9 4.1× Prague Prague, Czechia 1 16 April 9.8 3.3× Zagreb Zagreb, Croatia 2 15 April 12.8 3.1× Győr Győr-Moson-Sopron, Hungary 1 16 April 9.2 3.1× Stodůlky Prague, Czechia 2 15 April 13.0 2.9× Púchov Trenčín Region, Slovakia 2 16 April 12.2 2.9× Baia Mare Maramureş, Romania 1 16 April 11.2 2.9× Senica Trnava Region, Slovakia 1 16 April 9.9 2.9× Malacky Bratislava Region, Slovakia 1 16 April 9.0 2.8× Komárno Nitra Region, Slovakia 1 16 April 10.2 2.7× Esztergom Komárom-Esztergom, Hungary 1 16 April 9.7 2.7× Žilina Žilina Region, Slovakia 1 16 April 11.5 2.6× Vranov nad Topľou Prešov Region, Slovakia 1 16 April 11.3 2.5× Poprad Prešov Region, Slovakia 1 16 April 10.3 2.5× Târgu Mureş Mureș County, Romania 1 17 April 17.5 2.3× Obrenovac Central Serbia, Serbia 2 16 April 14.5 2.3× Bardejov Prešov Region, Slovakia 1 16 April 11.1 2.3× Ružomberok Žilina Region, Slovakia 1 16 April 11.2 2.3× Trebišov Košice Region, Slovakia 1 16 April 11.7 2.2× Prešov Prešov Region, Slovakia 1 16 April 14.5 2.1× Debrecen Hajdú-Bihar, Hungary 2 16 April 13.6 2.1× Banja Luka Srpska, Bosnia and Herzegovina 1 17 April 13.3 2.0× Humenné Prešov Region, Slovakia 1 16 April 12.8 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 Slovakia and Hungary
Number 2 of 8 episodes in Slovakia and Hungary since our records began, by cities reached.
South-eastern Europe, 28 December 2023 to 1 January 2024 44 Eastern Europe, 15 to 17 April 2026 25 Eastern and southern Europe, July 2024 21 Slovakia, Czechia and Poland, June 2026 18 South-eastern Europe, 11 to 13 December 2023 18 Europe, June 2026 14 Czechia, Slovakia and Poland, January 2023 9 Romania and Slovakia, October 2025 8 Bars: cities reached; colour: the level of the episode's highest daily reading.
Use this page SmogRank, Eastern Europe, 15 to 17 April 2026: 25 cities with PM2.5 at twice their usual or more, 15 to 17 April 2026, smogrank.com/episodes/2026-04-15-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. Fire detections from NASA FIRMS; smoke maps from NOAA HMS.
