SmogRank / Episodes / Slovakia

Eastern Europe, June 2026

For 1 day, on 30 June 2026, 14 cities in Slovakia, Romania, Hungary and 2 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Târgu Mureş, Mureș County, Romania: 31.4 µg/m³ on 30 June, about 3.0× its usual 10.5.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached14in 5 countries
Days130 June 2026
Worst day30 June14 cities counted
Furthest above usual3.5×Říčany

Day by day

30 June 14 cities at twice their usual or more
MiskolcKazincbarcikaGyöngyösLučenecPopradNyíregyházaGyálPrešovLiptovský MikulášBudapestBanská BystricaRužomberokSzegedEsztergomŽiar nad HronomDunaújvárosHandlováMartinKikindaJasłoŽilinaTarnówŻywiecPartizánskeKrakówKrosnoČadcaTimişoaraKomárnoDębicaBielsko-BialaPúchovCzechowice-DziedziceMielecRzeszówLiberpolisVeszprémZalăuSereďKatowiceJastrzębie ZdrójGyőrPécsTrnavaPrzemyślSenecJarosławBaia MareRacibórzSenicaPezinokKędzierzyn-KoźleCluj-NapocaBratislavaSighetu MarmaţieiMalackyDevínska Nová VesDejViennaKlosterneuburgMödlingPerchtoldsdorfWiener NeustadtEisenzickenPtujSankt PöltenMariborGrazCeljeCodleaAmstettenBraşovTrbovljeNovo MestoWolfsbergPiatra NeamţSteyrAnsfeldenLinzTraunLjubljanaKlagenfurt am WörtherseeKranjWelsStodůlkyKoperDebrecenSuceavaZagrebKošiceNitraHumennéZvolenTrebišovPrievidzaVranov nad TopľouBardejovSninaTârgu MureşŘíčany
27 Jun2829301 Jul23
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

ŘíčanyŘíčany, 27 June: 29.4 µg/m³, 3.5× usualŘíčany, 28 June: 22.6 µg/m³, 2.7× usualŘíčany, 29 June: 24.8 µg/m³, 2.9× usualŘíčany, 30 June: 30.0 µg/m³, 3.5× usualŘíčany, 1 July: 18.0 µg/m³, 2.1× usualŘíčany, 2 July: 10.6 µg/m³, 1.2× usualŘíčany, 3 July: 0.9 µg/m³, 0.1× usualKošiceKošice, 27 June: 25.6 µg/m³, 2.0× usualKošice, 28 June: 27.8 µg/m³, 2.2× usualKošice, 29 June: no readingKošice, 30 June: 28.4 µg/m³, 2.3× usualKošice, 1 July: 21.9 µg/m³, 1.7× usualKošice, 2 July: 9.8 µg/m³, 0.8× usualKošice, 3 July: 12.1 µg/m³, 1.0× usualZvolenZvolen, 27 June: 25.3 µg/m³, 2.4× usualZvolen, 28 June: 25.6 µg/m³, 2.4× usualZvolen, 29 June: no readingZvolen, 30 June: 26.6 µg/m³, 2.5× usualZvolen, 1 July: 23.8 µg/m³, 2.2× usualZvolen, 2 July: 9.2 µg/m³, 0.9× usualZvolen, 3 July: 12.6 µg/m³, 1.2× usualNitraNitra, 27 June: 25.2 µg/m³, 2.2× usualNitra, 28 June: 24.0 µg/m³, 2.1× usualNitra, 29 June: no readingNitra, 30 June: 27.6 µg/m³, 2.4× usualNitra, 1 July: 24.2 µg/m³, 2.1× usualNitra, 2 July: 8.3 µg/m³, 0.7× usualNitra, 3 July: 13.9 µg/m³, 1.2× usualZagrebZagreb, 27 June: 23.6 µg/m³, 2.0× usualZagreb, 28 June: 30.6 µg/m³, 2.6× usualZagreb, 29 June: 34.8 µg/m³, 3.0× usualZagreb, 30 June: 26.2 µg/m³, 2.3× usualZagreb, 1 July: 19.3 µg/m³, 1.7× usualZagreb, 2 July: 9.0 µg/m³, 0.8× usualZagreb, 3 July: 12.8 µg/m³, 1.1× usualBardejovBardejov, 27 June: 22.3 µg/m³, 2.5× usualBardejov, 28 June: 27.3 µg/m³, 3.1× usualBardejov, 29 June: no readingBardejov, 30 June: 25.9 µg/m³, 2.9× usualBardejov, 1 July: 23.8 µg/m³, 2.7× usualBardejov, 2 July: 7.9 µg/m³, 0.9× usualBardejov, 3 July: 8.8 µg/m³, 1.0× usualHumennéHumenné, 27 June: 24.9 µg/m³, 2.1× usualHumenné, 28 June: 26.6 µg/m³, 2.2× usualHumenné, 29 June: no readingHumenné, 30 June: 28.8 µg/m³, 2.4× usualHumenné, 1 July: 23.9 µg/m³, 2.0× usualHumenné, 2 July: 8.3 µg/m³, 0.7× usualHumenné, 3 July: 7.8 µg/m³, 0.7× usualTârgu MureşTârgu Mureş, 27 June: 20.6 µg/m³, 2.0× usualTârgu Mureş, 28 June: 20.5 µg/m³, 2.0× usualTârgu Mureş, 29 June: 25.8 µg/m³, 2.5× usualTârgu Mureş, 30 June: 31.4 µg/m³, 3.0× usualTârgu Mureş, 1 July: 29.0 µg/m³, 2.8× usualTârgu Mureş, 2 July: 23.3 µg/m³, 2.2× usualTârgu Mureş, 3 July: 15.8 µg/m³, 1.5× usualVranov nad TopľouVranov nad Topľou, 27 June: 22.1 µg/m³, 2.2× usualVranov nad Topľou, 28 June: 22.7 µg/m³, 2.2× usualVranov nad Topľou, 29 June: no readingVranov nad Topľou, 30 June: 29.0 µg/m³, 2.8× usualVranov nad Topľou, 1 July: 24.9 µg/m³, 2.4× usualVranov nad Topľou, 2 July: 10.1 µg/m³, 1.0× usualVranov nad Topľou, 3 July: 9.1 µg/m³, 0.9× usualSninaSnina, 27 June: 19.6 µg/m³, 2.1× usualSnina, 28 June: 21.6 µg/m³, 2.3× usualSnina, 29 June: no readingSnina, 30 June: 27.4 µg/m³, 2.9× usualSnina, 1 July: 21.3 µg/m³, 2.3× usualSnina, 2 July: 6.1 µg/m³, 0.6× usualSnina, 3 July: no readingSuceavaSuceava, 27 June: 17.1 µg/m³, 1.3× usualSuceava, 28 June: no readingSuceava, 29 June: no readingSuceava, 30 June: 27.2 µg/m³, 2.1× usualSuceava, 1 July: 25.4 µg/m³, 2.0× usualSuceava, 2 July: 18.1 µg/m³, 1.4× usualSuceava, 3 July: no readingTrebišovTrebišov, 27 June: 22.8 µg/m³, 2.1× usualTrebišov, 28 June: 24.2 µg/m³, 2.2× usualTrebišov, 29 June: no readingTrebišov, 30 June: 27.1 µg/m³, 2.5× usualTrebišov, 1 July: 25.2 µg/m³, 2.3× usualTrebišov, 2 July: 8.1 µg/m³, 0.7× usualTrebišov, 3 July: 8.1 µg/m³, 0.7× usualDebrecenDebrecen, 27 June: 17.7 µg/m³, 1.4× usualDebrecen, 28 June: 17.7 µg/m³, 1.4× usualDebrecen, 29 June: 24.7 µg/m³, 1.9× usualDebrecen, 30 June: 26.5 µg/m³, 2.0× usualDebrecen, 1 July: 17.3 µg/m³, 1.3× usualDebrecen, 2 July: 12.1 µg/m³, 0.9× usualDebrecen, 3 July: 7.3 µg/m³, 0.6× usualPrievidzaPrievidza, 27 June: 22.8 µg/m³, 2.4× usualPrievidza, 28 June: 23.8 µg/m³, 2.5× usualPrievidza, 29 June: no readingPrievidza, 30 June: 26.1 µg/m³, 2.7× usualPrievidza, 1 July: 12.9 µg/m³, 1.3× usualPrievidza, 2 July: 3.7 µg/m³, 0.4× usualPrievidza, 3 July: 5.6 µg/m³, 0.6× usual27 Jun2829301 Jul23
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
ŘíčanyCentral Bohemia, Czechia1 30.030 June8.53.5×
BardejovPrešov Region, Slovakia1 27.328 June8.93.1×
ZagrebZagreb, Croatia1 34.829 June11.63.0×
Târgu MureşMureș County, Romania1 31.430 June10.53.0×
SninaPrešov Region, Slovakia1 27.430 June9.42.9×
Vranov nad TopľouPrešov Region, Slovakia1 29.030 June10.22.8×
PrievidzaTrenčín Region, Slovakia1 26.130 June9.62.7×
ZvolenBanská Bystrica Region, Slovakia1 26.630 June10.72.5×
TrebišovKošice Region, Slovakia1 27.130 June11.02.5×
HumennéPrešov Region, Slovakia1 28.830 June11.92.4×
NitraNitra Region, Slovakia1 27.630 June11.62.4×
KošiceKošice Region, Slovakia1 28.430 June12.62.3×
SuceavaSuceava, Romania1 27.230 June12.82.1×
DebrecenHajdú-Bihar, Hungary1 26.530 June13.02.0×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in Slovakia and Romania

Number 8 of 10 episodes in Slovakia and Romania since our records began, by cities reached.

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

Use this page

SmogRank, Eastern Europe, June 2026: 14 cities with PM2.5 at twice their usual or more, 30 June 2026, smogrank.com/episodes/2026-06-eastern-europe (accessed 2 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.