SmogRank / Episodes / Poland

Poland and Czechia, April 2024

For 4 days, from 23 to 26 April 2024, 17 cities in Poland and Czechia had PM2.5 at least twice their usual for the time of year. The worst reading was Racibórz, Silesia, Poland: 36.6 µg/m³ on 23 April, about 3.1× its usual 11.7.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached17in 2 countries
Days423 to 26 April 2024
Worst day24 April7 cities counted
Furthest above usual3.5×Działdowo

Day by day

24 April 7 cities at twice their usual or more
ŁódźPłockŻyrardówWłocławekRadomskoPruszkówLegionowoWarsawKonstancin-JeziornaWawerPułtuskOtwockKaliszRadomStarachowiceŚwiecieOlsztynBydgoszczElblągKrakówStrzelce OpolskieOpoleKędzierzyn-KoźleCzechowice-DziedziceBielsko-BialaJastrzębie ZdrójWodzisław ŚląskiGdańskŻywiecTarnówMielecBohumínCieszynČeský TěšínKościerzynaSiedlceHavířovOstravaGdyniaFrýdek-MístekOpavaČadcaWrocławJasłoBytówLublinRzeszówValašské MeziříčíGrajewoEłkKrosnoBardejovPřerovOlomoucKroměřížBiałystokAugustówSuwałkiZamośćPrzemyślNáchodJelenia GóraZielona GóraHradec KrálovéPardubiceGorzów WielkopolskiŻaryKołobrzegLiberecBogatyniaEisenhüttenstadtMladá BoleslavKaunasFrankfurt (Oder)SzczecinCottbusSchwedt (Oder)DěčínPragueLubnjowStrausbergÚstí nad LabemKladnoBerounNeuenhagenTepliceKönigs WusterhausenBernau bei BerlinVilniusLitvínovMostBlankenfelde-MahlowBerlinTeltowKleinmachnowLuckenwaldeNeubrandenburgFalkenseePotsdamKadaňPilsenStralsundKutnoŁaskKłodzkoKatowiceToruńŁukówKościanZgierzTřinecNiskoSkarżysko-KamiennaDębicaPoznańLęborkRacibórzJarosławDziałdowo
20 Apr212223242526272829
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

RacibórzRacibórz, 20 April: 6.5 µg/m³Racibórz, 21 April: 18.5 µg/m³Racibórz, 22 April: 16.8 µg/m³Racibórz, 23 April: 36.6 µg/m³, 3.1× its usual 11.7Racibórz, 24 April: 28.9 µg/m³, 2.6× its usual 11.1Racibórz, 25 April: 16.4 µg/m³Racibórz, 26 April: 14.8 µg/m³Racibórz, 27 April: 18.9 µg/m³Racibórz, 28 April: 11.1 µg/m³Racibórz, 29 April: 15.1 µg/m³KatowiceKatowice, 20 April: 9.1 µg/m³Katowice, 21 April: 17.5 µg/m³Katowice, 22 April: 15.2 µg/m³Katowice, 23 April: 28.5 µg/m³, 2.2× its usual 12.9Katowice, 24 April: 28.2 µg/m³, 2.2× its usual 12.8Katowice, 25 April: 21.2 µg/m³Katowice, 26 April: 18.3 µg/m³Katowice, 27 April: 16.5 µg/m³Katowice, 28 April: 16.0 µg/m³Katowice, 29 April: 14.0 µg/m³DziałdowoDziałdowo, 20 April: 18.7 µg/m³Działdowo, 21 April: 8.2 µg/m³Działdowo, 22 April: 7.4 µg/m³Działdowo, 23 April: 25.8 µg/m³, 2.4× its usual 10.8Działdowo, 24 April: 17.3 µg/m³Działdowo, 25 April: 21.6 µg/m³Działdowo, 26 April: 36.5 µg/m³, 3.5× its usual 10.3Działdowo, 27 April: 20.8 µg/m³Działdowo, 28 April: 17.9 µg/m³Działdowo, 29 April: 12.8 µg/m³KłodzkoKłodzko, 20 April: no readingKłodzko, 21 April: no readingKłodzko, 22 April: no readingKłodzko, 23 April: 25.7 µg/m³, 2.2× its usual 11.5Kłodzko, 24 April: 22.2 µg/m³Kłodzko, 25 April: 19.8 µg/m³Kłodzko, 26 April: 15.8 µg/m³Kłodzko, 27 April: 8.6 µg/m³Kłodzko, 28 April: 9.9 µg/m³Kłodzko, 29 April: 13.3 µg/m³ŁaskŁask, 20 April: 10.6 µg/m³Łask, 21 April: 10.9 µg/m³Łask, 22 April: 14.2 µg/m³Łask, 23 April: 21.3 µg/m³Łask, 24 April: 29.1 µg/m³, 2.1× its usual 13.9Łask, 25 April: 21.3 µg/m³Łask, 26 April: 11.3 µg/m³Łask, 27 April: 11.4 µg/m³Łask, 28 April: 10.8 µg/m³Łask, 29 April: 10.1 µg/m³ZgierzZgierz, 20 April: 14.7 µg/m³Zgierz, 21 April: 9.7 µg/m³Zgierz, 22 April: 19.4 µg/m³Zgierz, 23 April: 20.3 µg/m³Zgierz, 24 April: 26.6 µg/m³, 2.5× its usual 10.5Zgierz, 25 April: 25.0 µg/m³, 2.4× its usual 10.5Zgierz, 26 April: 13.8 µg/m³Zgierz, 27 April: 10.7 µg/m³Zgierz, 28 April: 11.1 µg/m³Zgierz, 29 April: 9.2 µg/m³DębicaDębica, 20 April: 12.3 µg/m³Dębica, 21 April: 15.4 µg/m³Dębica, 22 April: 14.6 µg/m³Dębica, 23 April: 21.2 µg/m³Dębica, 24 April: 26.3 µg/m³, 2.3× its usual 11.3Dębica, 25 April: 27.5 µg/m³, 2.6× its usual 10.7Dębica, 26 April: 19.9 µg/m³Dębica, 27 April: 9.4 µg/m³Dębica, 28 April: 9.8 µg/m³Dębica, 29 April: 7.6 µg/m³ToruńToruń, 20 April: 13.0 µg/m³Toruń, 21 April: 10.9 µg/m³Toruń, 22 April: 9.2 µg/m³Toruń, 23 April: 14.7 µg/m³Toruń, 24 April: 26.1 µg/m³, 2.3× its usual 11.6Toruń, 25 April: 21.2 µg/m³Toruń, 26 April: 18.4 µg/m³Toruń, 27 April: 19.2 µg/m³Toruń, 28 April: 17.3 µg/m³Toruń, 29 April: 16.5 µg/m³TřinecTřinec, 20 April: 5.7 µg/m³Třinec, 21 April: 12.7 µg/m³Třinec, 22 April: 11.9 µg/m³Třinec, 23 April: 20.0 µg/m³Třinec, 24 April: 25.1 µg/m³, 2.6× its usual 9.7Třinec, 25 April: 7.7 µg/m³Třinec, 26 April: 9.9 µg/m³Třinec, 27 April: 14.5 µg/m³Třinec, 28 April: 10.6 µg/m³Třinec, 29 April: 9.9 µg/m³PoznańPoznań, 20 April: 10.8 µg/m³Poznań, 21 April: 8.7 µg/m³Poznań, 22 April: 8.7 µg/m³Poznań, 23 April: 16.6 µg/m³Poznań, 24 April: 23.5 µg/m³Poznań, 25 April: 29.7 µg/m³, 2.7× its usual 10.8Poznań, 26 April: 14.0 µg/m³Poznań, 27 April: 16.8 µg/m³Poznań, 28 April: 16.0 µg/m³Poznań, 29 April: 18.5 µg/m³KościanKościan, 20 April: 6.7 µg/m³Kościan, 21 April: 6.7 µg/m³Kościan, 22 April: 12.1 µg/m³Kościan, 23 April: 16.6 µg/m³Kościan, 24 April: 22.9 µg/m³Kościan, 25 April: 29.6 µg/m³, 2.4× its usual 12.1Kościan, 26 April: 13.2 µg/m³Kościan, 27 April: 13.2 µg/m³Kościan, 28 April: 10.3 µg/m³Kościan, 29 April: 13.4 µg/m³LęborkLębork, 20 April: 10.0 µg/m³Lębork, 21 April: 22.6 µg/m³Lębork, 22 April: 8.1 µg/m³Lębork, 23 April: 12.6 µg/m³Lębork, 24 April: 23.7 µg/m³Lębork, 25 April: 29.2 µg/m³, 2.8× its usual 10.6Lębork, 26 April: 19.8 µg/m³Lębork, 27 April: 15.2 µg/m³Lębork, 28 April: 13.0 µg/m³Lębork, 29 April: 11.2 µg/m³Skarżysko-KamiennaSkarżysko-Kamienna, 20 April: 9.3 µg/m³Skarżysko-Kamienna, 21 April: 10.3 µg/m³Skarżysko-Kamienna, 22 April: 16.2 µg/m³Skarżysko-Kamienna, 23 April: 23.6 µg/m³Skarżysko-Kamienna, 24 April: 20.4 µg/m³Skarżysko-Kamienna, 25 April: 27.1 µg/m³, 2.6× its usual 10.5Skarżysko-Kamienna, 26 April: 22.6 µg/m³Skarżysko-Kamienna, 27 April: 20.3 µg/m³Skarżysko-Kamienna, 28 April: 12.6 µg/m³Skarżysko-Kamienna, 29 April: 10.2 µg/m³KutnoKutno, 20 April: 10.3 µg/m³Kutno, 21 April: 8.4 µg/m³Kutno, 22 April: 11.1 µg/m³Kutno, 23 April: 19.4 µg/m³Kutno, 24 April: 21.9 µg/m³Kutno, 25 April: 25.0 µg/m³, 2.0× its usual 12.4Kutno, 26 April: 14.6 µg/m³Kutno, 27 April: 13.6 µg/m³Kutno, 28 April: 14.5 µg/m³Kutno, 29 April: 12.6 µg/m³JarosławJarosław, 20 April: 8.7 µg/m³Jarosław, 21 April: 17.3 µg/m³Jarosław, 22 April: no readingJarosław, 23 April: 17.3 µg/m³Jarosław, 24 April: 13.9 µg/m³Jarosław, 25 April: 23.5 µg/m³Jarosław, 26 April: 29.5 µg/m³, 3.2× its usual 9.1Jarosław, 27 April: 15.2 µg/m³Jarosław, 28 April: 12.6 µg/m³Jarosław, 29 April: 9.6 µg/m³ŁukówŁuków, 20 April: 12.6 µg/m³Łuków, 21 April: 11.0 µg/m³Łuków, 22 April: 8.9 µg/m³Łuków, 23 April: 16.6 µg/m³Łuków, 24 April: 13.6 µg/m³Łuków, 25 April: 18.3 µg/m³Łuków, 26 April: 28.0 µg/m³, 2.3× its usual 12.4Łuków, 27 April: 23.9 µg/m³Łuków, 28 April: 19.3 µg/m³Łuków, 29 April: 10.1 µg/m³NiskoNisko, 20 April: 11.1 µg/m³Nisko, 21 April: 14.0 µg/m³Nisko, 22 April: 13.5 µg/m³Nisko, 23 April: 16.8 µg/m³Nisko, 24 April: 13.6 µg/m³Nisko, 25 April: 21.6 µg/m³Nisko, 26 April: 26.8 µg/m³, 2.6× its usual 10.4Nisko, 27 April: 20.2 µg/m³Nisko, 28 April: 14.7 µg/m³Nisko, 29 April: 10.1 µg/m³20 Apr212223242526272829
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
DziałdowoWarmia-Masuria, Poland2 36.526 April10.33.5×
JarosławSubcarpathia, Poland1 29.526 April9.13.2×
RacibórzSilesia, Poland2 36.623 April11.73.1×
LęborkPomerania, Poland1 29.225 April10.62.8×
PoznańGreater Poland, Poland1 29.725 April10.82.7×
DębicaSubcarpathia, Poland2 27.525 April10.72.6×
Skarżysko-KamiennaŚwiętokrzyskie, Poland1 27.125 April10.52.6×
NiskoSubcarpathia, Poland1 26.826 April10.42.6×
TřinecMoravian-Silesian Region, Czechia1 25.124 April9.72.6×
ZgierzŁódź Voivodeship, Poland2 26.624 April10.52.5×
KościanGreater Poland, Poland1 29.625 April12.12.4×
ŁukówLublin, Poland1 28.026 April12.42.3×
ToruńKujawsko-Pomorskie, Poland1 26.124 April11.62.3×
KatowiceSilesia, Poland2 28.523 April12.92.2×
KłodzkoLower Silesia, Poland1 25.723 April11.52.2×
ŁaskŁódź Voivodeship, Poland1 29.124 April13.92.1×
KutnoŁódź Voivodeship, Poland1 25.025 April12.42.0×

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 Czechia

Number 28 of 43 episodes in Poland and Czechia since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 43.

Use this page

SmogRank, Poland and Czechia, April 2024: 17 cities with PM2.5 at twice their usual or more, 23 to 26 April 2024, smogrank.com/episodes/2024-04-poland-and-czechia (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.