SmogRank / Episodes / Poland

Poland and Hungary, March 2026

For 2 days, from 12 to 13 March 2026, 9 cities in Poland and Hungary had PM2.5 at least twice their usual for the time of year. The worst reading was Łask, Łódź Voivodeship, Poland: 64.4 µg/m³ on 13 March, about 2.3× its usual 28.0.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 2 countries
Days212 to 13 March 2026
Worst day12 March7 cities counted
Furthest above usual2.8×Białystok

Day by day

12 March 7 cities at twice their usual or more
StarachowiceRadomKielceMielecDębicaTarnówKonstancin-JeziornaOtwockWawerPruszkówWarsawŻyrardówRzeszówJasłoLegionowoLublinKrosnoKrakówBardejovŁódźCiechanówZgierzPrzemyślPrešovPłockPopradVranov nad TopľouHumennéSninaKatowiceKošiceŻywiecCzechowice-DziedziceTrebišovLiptovský MikulášWłocławekRužomberokJastrzębie ZdrójOlsztynKazincbarcikaTřinecCieszynČeský TěšínČadcaKarvináWodzisław ŚląskiMiskolcMartinHavířovKędzierzyn-KoźleŽilinaBohumínBanská BystricaLučenecRacibórzFrýdek-MístekOstravaKaliszZvolenToruńOpoleAugustówHandlováŽiar nad HronomPrievidzaPúchovGyöngyösDebrecenElblągPartizánskeBrzegHraniceTrenčínBydgoszczPřerovEsztergomSighetu MarmaţieiBaia MareNitraBudapestWrocławGdańskOlomoucGdyniaSereďKościerzynaPoznańTrnavaKomárnoSenicaKłodzkoHodonínSenecPezinokGyőrŽideniceMalackyBrnoBratislavaDevínska Nová VesHradec KrálovéŽďár nad SázavouJelenia GóraPardubiceKlosterneuburgZnojmoViennaMödlingPerchtoldsdorfZielona GóraJihlavaŻarySuceavaGorzów WielkopolskiSankt PöltenKołobrzegNiskoRadomskoNyíregyházaJarosławZamośćŁaskEłkSuwałkiBiałystok
9 Mar10111213141516
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, 9 March: 30.8 µg/m³Łask, 10 March: 32.1 µg/m³Łask, 11 March: 44.0 µg/m³Łask, 12 March: 60.3 µg/m³, 2.1× its usual 28.3Łask, 13 March: 64.4 µg/m³, 2.3× its usual 28.0Łask, 14 March: 38.1 µg/m³Łask, 15 March: 49.1 µg/m³Łask, 16 March: 47.3 µg/m³RadomskoRadomsko, 9 March: 28.4 µg/m³Radomsko, 10 March: 28.3 µg/m³Radomsko, 11 March: 27.9 µg/m³Radomsko, 12 March: 46.7 µg/m³, 2.1× its usual 22.0Radomsko, 13 March: 26.2 µg/m³Radomsko, 14 March: 16.1 µg/m³Radomsko, 15 March: 20.2 µg/m³Radomsko, 16 March: 29.0 µg/m³ZamośćZamość, 9 March: 24.9 µg/m³Zamość, 10 March: 19.9 µg/m³Zamość, 11 March: 22.0 µg/m³Zamość, 12 March: 44.1 µg/m³, 2.2× its usual 19.7Zamość, 13 March: 31.6 µg/m³Zamość, 14 March: 22.7 µg/m³Zamość, 15 March: 19.3 µg/m³Zamość, 16 March: 28.8 µg/m³EłkEłk, 9 March: 38.0 µg/m³Ełk, 10 March: 30.2 µg/m³Ełk, 11 March: 37.4 µg/m³Ełk, 12 March: 40.4 µg/m³, 2.6× its usual 15.8Ełk, 13 March: 29.0 µg/m³Ełk, 14 March: 16.9 µg/m³Ełk, 15 March: 16.6 µg/m³Ełk, 16 March: 23.8 µg/m³JarosławJarosław, 9 March: 23.6 µg/m³Jarosław, 10 March: 34.0 µg/m³Jarosław, 11 March: 15.0 µg/m³Jarosław, 12 March: 39.9 µg/m³, 2.2× its usual 17.8Jarosław, 13 March: no readingJarosław, 14 March: no readingJarosław, 15 March: no readingJarosław, 16 March: no readingBiałystokBiałystok, 9 March: 34.0 µg/m³Białystok, 10 March: 23.8 µg/m³Białystok, 11 March: 38.5 µg/m³Białystok, 12 March: 39.2 µg/m³, 2.5× its usual 15.8Białystok, 13 March: 43.1 µg/m³, 2.8× its usual 15.6Białystok, 14 March: 16.6 µg/m³Białystok, 15 March: 16.8 µg/m³Białystok, 16 March: 26.6 µg/m³SuwałkiSuwałki, 9 March: 39.8 µg/m³Suwałki, 10 March: 30.6 µg/m³Suwałki, 11 March: 48.4 µg/m³Suwałki, 12 March: 36.4 µg/m³, 2.7× its usual 13.7Suwałki, 13 March: 27.3 µg/m³Suwałki, 14 March: 16.4 µg/m³Suwałki, 15 March: 16.8 µg/m³Suwałki, 16 March: 27.2 µg/m³NiskoNisko, 9 March: 33.2 µg/m³Nisko, 10 March: 35.9 µg/m³Nisko, 11 March: 20.2 µg/m³Nisko, 12 March: 36.9 µg/m³Nisko, 13 March: 39.3 µg/m³, 2.0× its usual 19.4Nisko, 14 March: 27.3 µg/m³Nisko, 15 March: 23.7 µg/m³Nisko, 16 March: 28.7 µg/m³NyíregyházaNyíregyháza, 9 March: 26.6 µg/m³Nyíregyháza, 10 March: 29.6 µg/m³Nyíregyháza, 11 March: 18.2 µg/m³Nyíregyháza, 12 March: 23.3 µg/m³Nyíregyháza, 13 March: 37.2 µg/m³, 2.2× its usual 16.9Nyíregyháza, 14 March: 27.4 µg/m³Nyíregyháza, 15 March: 24.1 µg/m³Nyíregyháza, 16 March: 23.3 µg/m³9 Mar10111213141516
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
BiałystokPodlasie, Poland2 43.113 March15.62.8×
SuwałkiPodlasie, Poland1 36.412 March13.72.7×
EłkWarmia-Masuria, Poland1 40.412 March15.82.6×
ŁaskŁódź Voivodeship, Poland2 64.413 March28.02.3×
ZamośćLublin, Poland1 44.112 March19.72.2×
JarosławSubcarpathia, Poland1 39.912 March17.82.2×
NyíregyházaSzabolcs-Szatmár-Bereg, Hungary1 37.213 March16.92.2×
RadomskoŁódź Voivodeship, Poland1 46.712 March22.02.1×
NiskoSubcarpathia, Poland1 39.313 March19.42.0×

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 Hungary

Number 33 of 36 episodes in Poland and Hungary since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 36.

Use this page

SmogRank, Poland and Hungary, March 2026: 9 cities with PM2.5 at twice their usual or more, 12 to 13 March 2026, smogrank.com/episodes/2026-03-poland-and-hungary (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.