SmogRank / Episodes / Poland

Poland, Hungary and 2 more countries, April 2026

For 2 days, from 2 to 3 April 2026, 10 cities in Poland, Austria, Serbia and 1 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Łask, Łódź Voivodeship, Poland: 50.3 µg/m³ on 2 April, about 2.6× its usual 19.6. Ended 3 April.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 4 countries
Days22 to 3 April 2026
Worst day3 April6 cities counted
Furthest above usual3.7×Veszprém

Day by day

3 April 6 cities at twice their usual or more
TrnavaSenicaTrenčínSereďNitraSenecHodonínPezinokChorvátsky Grob - Čierna VodaPartizánskeMalackyPúchovBratislavaKolárovoHraniceDevínska Nová VesPrievidzaHainburg an der DonauOlomoucGyőrKomárnoŽarnovicaHandlováMikulovSlatinaŽiar nad HronomŽilinaŽideniceBrnoGroß-EnzersdorfMartinČadcaEsztergomŠahyOščadnicaViennaBanská BystricaKlosterneuburgZvolenEisenstadtRacibórzMoravská TřebováJastrzębie ZdrójMödlingPerchtoldsdorfRužomberokZnojmoTullnWiener NeustadtKędzierzyn-KoźleŻywiecBudapestLiptovský MikulášLučenecOpoleGyálEisenzickenKłodzkoKatowiceDunaújvárosSankt PöltenSzczytnaBrzegHnúšťaFürstenfeldPardubiceGyöngyösRevúcaHradec KrálovéWrocławMurska SobotaWeizKrakówPopradPécsVeľká LomnicaDeuchendorfBruck an der MurGrazLeibnitzAmstettenPtujLeobenKazincbarcikaJelenia GóraMariborVoitsbergMiskolcKrompachySankt ValentinČeské BudějoviceKnittelfeldEnnsŘíčanySteyrZagrebWschowaWolfsbergLinzSzegedAnsfeldenCeljeTraunTarnówPrešovŁódźKošicePragueBardejovČaňaKielceStodůlkyLiezenTrbovljeWelsZagorje ob SaviPoznańNovo MestoJasłoŻaryZielona GóraDębicaBanja LukaPołaniecKikindaVranov nad TopľouKlagenfurt am WörtherseeTrebišovMielecNovi SadAttnang-PuchheimNyíregyházaDebrecenStarachowiceLjubljanaKranjKrosnoWłocławekHumennéKostelŻyrardówPłockRadomToruńBydgoszczSninaTravnikRzeszówCottbusTimişoaraEisenhüttenstadtPruszkówHalleinSalzburgBelgradeNiskoFreilassingKonstancin-JeziornaFrankfurt (Oder)WarsawNova GoricaLegionowoBurghausenLubnjowOtwockWawerGoriziaElsterwerdaSaalfelden am Steinernen MeerKoperCiechanówZell am SeeJarosławSmederevoPrzemyślTraunreutTrostberg an der AlzLienzOberviechtachKönigs WusterhausenStrausbergLublinSchöneicheZalăuSchwedt (Oder)LandshutNeuenhagenKiefersfeldenBlankenfelde-MahlowSchwandorf in BayernWeidenMahlowLuckenwaldeArzbergBernau bei BerlinAltenburgBerlinMarktredwitzTeltowKleinmachnowKelheimGreizZamośćPotsdamNeustadt an der DonauBaia MareWittenbergOranienburgDallgow-DöberitzGeraZeitzJenbachBitterfeld-WolfenSchwazMunichBad BelzigCluj-NapocaSighetu MarmaţieiNauenWeißenfelsDessauMerseburgDejBrandenburg an der HavelHalle (Saale)FürstenbergKahlaNeuruppinOsternienburger LandKöthenJenaRovinariTârgu JiuBernburgBurg bei MagdeburgMagdeburgCalafatBiałystokStendalWittenbergeCraiovaCzechowice-DziedziceObrenovacKaliszZgierzBielsko-BialaBadenRadomskoŁaskGorzów WielkopolskiVeszprém
30 Mar311 Apr23456
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

ŁaskŁask, 30 March: 37.9 µg/m³Łask, 31 March: 31.9 µg/m³Łask, 1 April: 46.8 µg/m³Łask, 2 April: 50.3 µg/m³, 2.6× its usual 19.6Łask, 3 April: 33.4 µg/m³Łask, 4 April: 22.9 µg/m³Łask, 5 April: 12.3 µg/m³Łask, 6 April: 9.3 µg/m³Bielsko-BialaBielsko-Biala, 30 March: no readingBielsko-Biala, 31 March: no readingBielsko-Biala, 1 April: 21.7 µg/m³Bielsko-Biala, 2 April: 41.7 µg/m³, 2.2× its usual 19.2Bielsko-Biala, 3 April: no readingBielsko-Biala, 4 April: no readingBielsko-Biala, 5 April: no readingBielsko-Biala, 6 April: no readingGorzów WielkopolskiGorzów Wielkopolski, 30 March: 13.3 µg/m³Gorzów Wielkopolski, 31 March: 12.4 µg/m³Gorzów Wielkopolski, 1 April: 27.3 µg/m³Gorzów Wielkopolski, 2 April: 35.9 µg/m³, 2.7× its usual 13.3Gorzów Wielkopolski, 3 April: 24.9 µg/m³Gorzów Wielkopolski, 4 April: 13.2 µg/m³Gorzów Wielkopolski, 5 April: 12.4 µg/m³Gorzów Wielkopolski, 6 April: 5.6 µg/m³BadenBaden, 30 March: 8.1 µg/m³Baden, 31 March: 2.2 µg/m³Baden, 1 April: 2.7 µg/m³Baden, 2 April: 27.6 µg/m³, 2.5× its usual 11.0Baden, 3 April: 20.0 µg/m³Baden, 4 April: 9.6 µg/m³Baden, 5 April: 3.2 µg/m³Baden, 6 April: 0.1 µg/m³KaliszKalisz, 30 March: 17.3 µg/m³Kalisz, 31 March: 18.1 µg/m³Kalisz, 1 April: 29.4 µg/m³Kalisz, 2 April: 33.9 µg/m³Kalisz, 3 April: 41.5 µg/m³, 2.1× its usual 19.5Kalisz, 4 April: 22.0 µg/m³Kalisz, 5 April: 15.5 µg/m³Kalisz, 6 April: 8.8 µg/m³RadomskoRadomsko, 30 March: 15.6 µg/m³Radomsko, 31 March: 13.7 µg/m³Radomsko, 1 April: 14.7 µg/m³Radomsko, 2 April: 25.8 µg/m³Radomsko, 3 April: 40.8 µg/m³, 2.5× its usual 16.6Radomsko, 4 April: 20.2 µg/m³Radomsko, 5 April: 12.9 µg/m³Radomsko, 6 April: 8.0 µg/m³ZgierzZgierz, 30 March: 17.8 µg/m³Zgierz, 31 March: 16.0 µg/m³Zgierz, 1 April: 18.1 µg/m³Zgierz, 2 April: 23.8 µg/m³Zgierz, 3 April: 39.6 µg/m³, 2.2× its usual 17.7Zgierz, 4 April: 27.4 µg/m³Zgierz, 5 April: 17.2 µg/m³Zgierz, 6 April: 9.3 µg/m³ObrenovacObrenovac, 30 March: no readingObrenovac, 31 March: no readingObrenovac, 1 April: 33.3 µg/m³Obrenovac, 2 April: 24.4 µg/m³Obrenovac, 3 April: 35.9 µg/m³, 2.1× its usual 16.8Obrenovac, 4 April: 23.3 µg/m³Obrenovac, 5 April: 29.3 µg/m³Obrenovac, 6 April: 19.5 µg/m³Czechowice-DziedziceCzechowice-Dziedzice, 30 March: 15.9 µg/m³Czechowice-Dziedzice, 31 March: 19.8 µg/m³Czechowice-Dziedzice, 1 April: 16.5 µg/m³Czechowice-Dziedzice, 2 April: 32.1 µg/m³Czechowice-Dziedzice, 3 April: 35.7 µg/m³, 2.0× its usual 17.6Czechowice-Dziedzice, 4 April: 20.4 µg/m³Czechowice-Dziedzice, 5 April: 6.8 µg/m³Czechowice-Dziedzice, 6 April: 4.5 µg/m³VeszprémVeszprém, 30 March: 6.3 µg/m³Veszprém, 31 March: 6.8 µg/m³Veszprém, 1 April: 7.8 µg/m³Veszprém, 2 April: 9.5 µg/m³Veszprém, 3 April: 32.5 µg/m³, 3.7× its usual 8.8Veszprém, 4 April: 9.0 µg/m³Veszprém, 5 April: 5.5 µg/m³Veszprém, 6 April: 6.7 µg/m³30 Mar311 Apr23456
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.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
VeszprémVeszprém, Hungary1 32.53 April8.83.7×
Gorzów WielkopolskiLubusz, Poland1 35.92 April13.32.7×
ŁaskŁódź Voivodeship, Poland1 50.32 April19.62.6×
RadomskoŁódź Voivodeship, Poland1 40.83 April16.62.5×
BadenLower Austria, Austria1 27.62 April11.02.5×
Bielsko-BialaSilesia, Poland1 41.72 April19.22.2×
ZgierzŁódź Voivodeship, Poland1 39.63 April17.72.2×
KaliszGreater Poland, Poland1 41.53 April19.52.1×
ObrenovacCentral Serbia, Serbia1 35.93 April16.82.1×
Czechowice-DziedziceSilesia, Poland1 35.73 April17.62.0×

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 Austria

Number 31 of 39 episodes in Poland and Austria since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 39.

Use this page

SmogRank, Poland, Hungary and 2 more countries, April 2026: 10 cities with PM2.5 at twice their usual or more, 2 to 3 April 2026, smogrank.com/episodes/2026-04-poland-hungary-and-2-more-countries (accessed 5 October 2026).

Download top 10 (PNG)

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.