SmogRank / Episodes / Poland

Poland, Slovenia and Slovakia, March 2026

For 1 day, on 25 March 2026, 9 cities in Poland, Slovakia and Slovenia had PM2.5 at least twice their usual for the time of year. The worst reading was Łask, Łódź Voivodeship, Poland: 58.4 µg/m³ on 25 March, about 2.6× its usual 22.9.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 3 countries
Days125 March 2026
Worst day25 March9 cities counted
Furthest above usual2.6ףask

Day by day

25 March 9 cities at twice their usual or more
KrakówKatowiceCzechowice-DziedziceŻywiecRadomskoJastrzębie ZdrójČadcaLiptovský MikulášRužomberokKędzierzyn-KoźleŽilinaRacibórzMartinPopradŁódźBanská BystricaZgierzOpolePúchovHandlováZvolenStarachowicePrievidzaŽiar nad HronomDębicaMielecLučenecRadomPartizánskeBardejovŻyrardówTrenčínJasłoKaliszBrzegPrešovPłockPruszkówKazincbarcikaKrosnoKošiceWłocławekNitraKonstancin-JeziornaWarsawRzeszówMiskolcGyöngyösOtwockWawerLegionowoVranov nad TopľouEsztergomWrocławSenicaTrnavaHumennéTrebišovBudapestCiechanówKłodzkoKomárnoGyálToruńSninaSenecPezinokMalackyNyíregyházaGyőrLublinBratislavaBydgoszczDevínska Nová VesPrzemyślDunaújvárosPoznańDebrecenVeszprémOlsztynKlosterneuburgViennaZamośćJelenia GóraElblągMödlingPerchtoldsdorfSzegedKościerzynaGdańskZielona GóraGdyniaPécsSankt PöltenEisenzickenKikindaEłkŻaryZalăuBaia MareŘíčanyGorzów WielkopolskiSighetu MarmaţieiAugustówPragueAmstettenGrazStodůlkyEisenhüttenstadtDejMariborCluj-NapocaFrankfurt (Oder)CottbusKołobrzegSteyrLinzAnsfeldenTraunZagrebLubnjowWolfsbergCeljeWelsSzczecinSchwedt (Oder)TrbovljeStrausbergKönigs WusterhausenNovo MestoNeuenhagenTârgu MureşKlagenfurt am WörtherseeBernau bei BerlinBlankenfelde-MahlowBerlinKranjLjubljanaLuckenwaldeTeltowKleinmachnowOranienburgNeubrandenburgGoriziaKielceJarosławBiałystokTarnówSereďPtujNiskoSuwałkiŁask
22 Mar232425262728
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, 22 March: 47.1 µg/m³Łask, 23 March: 62.3 µg/m³Łask, 24 March: 105.0 µg/m³Łask, 25 March: 58.4 µg/m³, 2.6× its usual 22.9Łask, 26 March: 32.1 µg/m³Łask, 27 March: 28.0 µg/m³Łask, 28 March: 36.1 µg/m³NiskoNisko, 22 March: 18.7 µg/m³Nisko, 23 March: 25.3 µg/m³Nisko, 24 March: 39.2 µg/m³Nisko, 25 March: 37.4 µg/m³, 2.4× its usual 15.7Nisko, 26 March: 19.7 µg/m³Nisko, 27 March: 9.7 µg/m³Nisko, 28 March: 21.3 µg/m³KielceKielce, 22 March: 17.4 µg/m³Kielce, 23 March: 25.1 µg/m³Kielce, 24 March: 40.3 µg/m³Kielce, 25 March: 36.8 µg/m³, 2.0× its usual 18.2Kielce, 26 March: 8.2 µg/m³Kielce, 27 March: 9.1 µg/m³Kielce, 28 March: 14.2 µg/m³TarnówTarnów, 22 March: 29.0 µg/m³Tarnów, 23 March: 39.4 µg/m³Tarnów, 24 March: 55.6 µg/m³Tarnów, 25 March: 33.0 µg/m³, 2.2× its usual 15.2Tarnów, 26 March: 20.3 µg/m³Tarnów, 27 March: 11.8 µg/m³Tarnów, 28 March: 19.6 µg/m³JarosławJarosław, 22 March: 20.0 µg/m³Jarosław, 23 March: 43.1 µg/m³Jarosław, 24 March: 59.1 µg/m³Jarosław, 25 March: 30.8 µg/m³, 2.1× its usual 14.7Jarosław, 26 March: 18.3 µg/m³Jarosław, 27 March: 11.0 µg/m³Jarosław, 28 March: 23.3 µg/m³BiałystokBiałystok, 22 March: 19.6 µg/m³Białystok, 23 March: 30.9 µg/m³Białystok, 24 March: 37.8 µg/m³Białystok, 25 March: 29.6 µg/m³, 2.2× its usual 13.7Białystok, 26 March: 11.7 µg/m³Białystok, 27 March: 7.8 µg/m³Białystok, 28 March: 15.8 µg/m³SuwałkiSuwałki, 22 March: 22.0 µg/m³Suwałki, 23 March: 37.7 µg/m³Suwałki, 24 March: 37.0 µg/m³Suwałki, 25 March: 28.9 µg/m³, 2.5× its usual 11.7Suwałki, 26 March: 7.9 µg/m³Suwałki, 27 March: 9.1 µg/m³Suwałki, 28 March: 10.6 µg/m³PtujPtuj, 22 March: 16.3 µg/m³Ptuj, 23 March: 15.1 µg/m³Ptuj, 24 March: 18.4 µg/m³Ptuj, 25 March: 27.9 µg/m³, 2.4× its usual 11.5Ptuj, 26 March: 1.2 µg/m³Ptuj, 27 March: 2.1 µg/m³Ptuj, 28 March: no readingSereďSereď, 22 March: 11.1 µg/m³Sereď, 23 March: 14.6 µg/m³Sereď, 24 March: 19.3 µg/m³Sereď, 25 March: 26.1 µg/m³, 2.3× its usual 11.3Sereď, 26 March: 3.3 µg/m³Sereď, 27 March: 9.1 µg/m³Sereď, 28 March: 10.4 µg/m³22 Mar232425262728
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
ŁaskŁódź Voivodeship, Poland1 58.425 March22.92.6×
SuwałkiPodlasie, Poland1 28.925 March11.72.5×
NiskoSubcarpathia, Poland1 37.425 March15.72.4×
PtujUrban Municipality of Ptuj, Slovenia1 27.925 March11.52.4×
SereďTrnava Region, Slovakia1 26.125 March11.32.3×
TarnówLesser Poland, Poland1 33.025 March15.22.2×
BiałystokPodlasie, Poland1 29.625 March13.72.2×
JarosławSubcarpathia, Poland1 30.825 March14.72.1×
KielceŚwiętokrzyskie, Poland1 36.825 March18.22.0×

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 Slovakia

Number 39 of 44 episodes in Poland and Slovakia since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 44.

Use this page

SmogRank, Poland, Slovenia and Slovakia, March 2026: 9 cities with PM2.5 at twice their usual or more, 25 March 2026, smogrank.com/episodes/2026-03-poland-slovenia-and-slovakia (accessed 4 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.