SmogRank / Episodes / Slovakia

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. Ended 30 June.

Few fires were detected near these cities on those days. Spreads like this usually come from still weather trapping smoke from heating, traffic and industry, or from dust.
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

Târgu MureşTârgu Mureş, 27 June: 20.6 µg/m³Târgu Mureş, 28 June: 20.5 µg/m³Târgu Mureş, 29 June: 25.8 µg/m³Târgu Mureş, 30 June: 31.4 µg/m³, 3.0× its usual 10.5Târgu Mureş, 1 July: 29.0 µg/m³Târgu Mureş, 2 July: 23.3 µg/m³Târgu Mureş, 3 July: 15.8 µg/m³ŘíčanyŘíčany, 27 June: 29.4 µg/m³Říčany, 28 June: 22.6 µg/m³Říčany, 29 June: 24.8 µg/m³Říčany, 30 June: 30.0 µg/m³, 3.5× its usual 8.5Říčany, 1 July: 18.0 µg/m³Říčany, 2 July: 10.6 µg/m³Říčany, 3 July: 0.9 µg/m³Vranov nad TopľouVranov nad Topľou, 27 June: 22.1 µg/m³Vranov nad Topľou, 28 June: 22.7 µg/m³Vranov nad Topľou, 29 June: no readingVranov nad Topľou, 30 June: 29.0 µg/m³, 2.8× its usual 10.2Vranov nad Topľou, 1 July: 24.9 µg/m³Vranov nad Topľou, 2 July: 10.1 µg/m³Vranov nad Topľou, 3 July: 9.1 µg/m³HumennéHumenné, 27 June: 24.9 µg/m³Humenné, 28 June: 26.6 µg/m³Humenné, 29 June: no readingHumenné, 30 June: 28.8 µg/m³, 2.4× its usual 11.9Humenné, 1 July: 23.9 µg/m³Humenné, 2 July: 8.3 µg/m³Humenné, 3 July: 7.8 µg/m³KošiceKošice, 27 June: 25.6 µg/m³Košice, 28 June: 27.8 µg/m³Košice, 29 June: no readingKošice, 30 June: 28.4 µg/m³, 2.3× its usual 12.6Košice, 1 July: 21.9 µg/m³Košice, 2 July: 9.8 µg/m³Košice, 3 July: 12.1 µg/m³NitraNitra, 27 June: 25.2 µg/m³Nitra, 28 June: 24.0 µg/m³Nitra, 29 June: no readingNitra, 30 June: 27.6 µg/m³, 2.4× its usual 11.6Nitra, 1 July: 24.2 µg/m³Nitra, 2 July: 8.3 µg/m³Nitra, 3 July: 13.9 µg/m³SninaSnina, 27 June: 19.6 µg/m³Snina, 28 June: 21.6 µg/m³Snina, 29 June: no readingSnina, 30 June: 27.4 µg/m³, 2.9× its usual 9.4Snina, 1 July: 21.3 µg/m³Snina, 2 July: 6.1 µg/m³Snina, 3 July: no readingSuceavaSuceava, 27 June: 17.1 µg/m³Suceava, 28 June: no readingSuceava, 29 June: no readingSuceava, 30 June: 27.2 µg/m³, 2.1× its usual 12.8Suceava, 1 July: 25.4 µg/m³Suceava, 2 July: 18.1 µg/m³Suceava, 3 July: no readingTrebišovTrebišov, 27 June: 22.8 µg/m³Trebišov, 28 June: 24.2 µg/m³Trebišov, 29 June: no readingTrebišov, 30 June: 27.1 µg/m³, 2.5× its usual 11.0Trebišov, 1 July: 25.2 µg/m³Trebišov, 2 July: 8.1 µg/m³Trebišov, 3 July: 8.1 µg/m³ZvolenZvolen, 27 June: 25.3 µg/m³Zvolen, 28 June: 25.6 µg/m³Zvolen, 29 June: no readingZvolen, 30 June: 26.6 µg/m³, 2.5× its usual 10.7Zvolen, 1 July: 23.8 µg/m³Zvolen, 2 July: 9.2 µg/m³Zvolen, 3 July: 12.6 µg/m³DebrecenDebrecen, 27 June: 17.7 µg/m³Debrecen, 28 June: 17.7 µg/m³Debrecen, 29 June: 24.7 µg/m³Debrecen, 30 June: 26.5 µg/m³, 2.0× its usual 13.0Debrecen, 1 July: 17.3 µg/m³Debrecen, 2 July: 12.1 µg/m³Debrecen, 3 July: 7.3 µg/m³ZagrebZagreb, 27 June: 23.6 µg/m³Zagreb, 28 June: 30.6 µg/m³Zagreb, 29 June: 34.8 µg/m³Zagreb, 30 June: 26.2 µg/m³, 2.3× its usual 11.6Zagreb, 1 July: 19.3 µg/m³Zagreb, 2 July: 9.0 µg/m³Zagreb, 3 July: 12.8 µg/m³PrievidzaPrievidza, 27 June: 22.8 µg/m³Prievidza, 28 June: 23.8 µg/m³Prievidza, 29 June: no readingPrievidza, 30 June: 26.1 µg/m³, 2.7× its usual 9.6Prievidza, 1 July: 12.9 µg/m³Prievidza, 2 July: 3.7 µg/m³Prievidza, 3 July: 5.6 µg/m³BardejovBardejov, 27 June: 22.3 µg/m³Bardejov, 28 June: 27.3 µg/m³Bardejov, 29 June: no readingBardejov, 30 June: 25.9 µg/m³, 2.9× its usual 8.9Bardejov, 1 July: 23.8 µg/m³Bardejov, 2 July: 7.9 µg/m³Bardejov, 3 July: 8.8 µg/m³27 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×
Târgu MureşMureș County, Romania1 31.430 June10.53.0×
SninaPrešov Region, Slovakia1 27.430 June9.42.9×
BardejovPrešov Region, Slovakia1 25.930 June8.92.9×
Vranov nad TopľouPrešov Region, Slovakia1 29.030 June10.22.8×
PrievidzaTrenčín Region, Slovakia1 26.130 June9.62.7×
TrebišovKošice Region, Slovakia1 27.130 June11.02.5×
ZvolenBanská Bystrica Region, Slovakia1 26.630 June10.72.5×
HumennéPrešov Region, Slovakia1 28.830 June11.92.4×
NitraNitra Region, Slovakia1 27.630 June11.62.4×
KošiceKošice Region, Slovakia1 28.430 June12.62.3×
ZagrebZagreb, Croatia1 26.230 June11.62.3×
SuceavaSuceava, Romania1 27.230 June12.82.1×
DebrecenHajdú-Bihar, Hungary1 26.530 June13.02.0×

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 Slovakia and Romania

Number 7 of 14 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. All 14.

Use this page

SmogRank, Europe, June 2026: 14 cities with PM2.5 at twice their usual or more, 30 June 2026, smogrank.com/episodes/2026-06-europe (accessed 5 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. Fire detections from NASA FIRMS; smoke maps from NOAA HMS.