SmogRank / Episodes / Slovenia

Slovenia, Slovakia and 2 more countries, March 2023

For 3 days, from 5 to 7 March 2023, 10 cities in Slovenia, Slovakia, Bosnia and Herzegovina and 1 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Bihać, Federation of B&H, Bosnia and Herzegovina: 68.3 µg/m³ on 5 March, about 2.7× its usual 25.0.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 4 countries
Days35 to 7 March 2023
Worst day6 March5 cities counted
Furthest above usual2.7×Bihać

Day by day

6 March 5 cities at twice their usual or more
GrazWolfsbergCeljeKlagenfurt am WörtherseeAmstettenSankt PöltenSteyrBadenRijekaMödlingPerchtoldsdorfKoprivnicaAnsfeldenTraunLinzViennaWelsKlosterneuburgKoperZnojmoDevínska Nová VesBratislavaČeské BudějoviceMalackySaalfelden am Steinernen MeerPezinokPassauSenecBrnoBurghausenŽideniceBanja LukaHodonínTrnavaSenicaTraunreutSereďKomárnoNitraZlínTrenčínPartizánskeLiberpolisPúchovInnsbruckMunichPrievidzaKelheimŽiar nad HronomStarnbergŽilinaZvolenIngolstadtMartinAugsburgRužomberokLučenecLiptovský MikulášKempten (Allgäu)Neu-UlmUlmPopradAalenBelgradeBiberach an der RißLindauSpišská Nová VesFriedrichshafenMariborPtujBanská BystricaKranjTrbovljeLjubljanaHandlováBolzanoNovo MestoBihać
2 Mar345678910
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

BihaćBihać, 2 March: 42.9 µg/m³Bihać, 3 March: 66.4 µg/m³Bihać, 4 March: 72.8 µg/m³Bihać, 5 March: 68.3 µg/m³, 2.7× its usual 25.0Bihać, 6 March: 40.0 µg/m³Bihać, 7 March: 15.6 µg/m³Bihać, 8 March: 6.0 µg/m³Bihać, 9 March: 4.3 µg/m³Bihać, 10 March: 8.3 µg/m³Novo MestoNovo Mesto, 2 March: 41.2 µg/m³Novo Mesto, 3 March: 46.5 µg/m³Novo Mesto, 4 March: 36.2 µg/m³Novo Mesto, 5 March: 45.6 µg/m³, 2.7× its usual 16.7Novo Mesto, 6 March: 41.1 µg/m³, 2.5× its usual 16.5Novo Mesto, 7 March: 26.2 µg/m³Novo Mesto, 8 March: 11.6 µg/m³Novo Mesto, 9 March: 10.1 µg/m³Novo Mesto, 10 March: 27.9 µg/m³TrbovljeTrbovlje, 2 March: 17.8 µg/m³Trbovlje, 3 March: 32.8 µg/m³Trbovlje, 4 March: 31.3 µg/m³Trbovlje, 5 March: 37.8 µg/m³, 2.3× its usual 16.4Trbovlje, 6 March: 36.8 µg/m³, 2.3× its usual 15.8Trbovlje, 7 March: 33.0 µg/m³, 2.2× its usual 15.3Trbovlje, 8 March: 12.3 µg/m³Trbovlje, 9 March: 11.9 µg/m³Trbovlje, 10 March: 17.6 µg/m³LjubljanaLjubljana, 2 March: 19.8 µg/m³Ljubljana, 3 March: 31.5 µg/m³Ljubljana, 4 March: 34.4 µg/m³Ljubljana, 5 March: 34.9 µg/m³, 2.0× its usual 17.3Ljubljana, 6 March: 37.9 µg/m³, 2.3× its usual 16.6Ljubljana, 7 March: 27.3 µg/m³Ljubljana, 8 March: 11.3 µg/m³Ljubljana, 9 March: 13.8 µg/m³Ljubljana, 10 March: 17.2 µg/m³PtujPtuj, 2 March: 26.2 µg/m³Ptuj, 3 March: 34.7 µg/m³Ptuj, 4 March: 34.2 µg/m³Ptuj, 5 March: 23.3 µg/m³Ptuj, 6 March: 39.5 µg/m³, 2.2× its usual 18.0Ptuj, 7 March: 30.3 µg/m³Ptuj, 8 March: 13.3 µg/m³Ptuj, 9 March: 6.6 µg/m³Ptuj, 10 March: 10.7 µg/m³KranjKranj, 2 March: 35.2 µg/m³Kranj, 3 March: 40.5 µg/m³Kranj, 4 March: 34.9 µg/m³Kranj, 5 March: 32.6 µg/m³Kranj, 6 March: 36.8 µg/m³, 2.3× its usual 15.7Kranj, 7 March: 27.4 µg/m³Kranj, 8 March: 23.2 µg/m³Kranj, 9 March: 19.5 µg/m³Kranj, 10 March: 18.7 µg/m³Banská BystricaBanská Bystrica, 2 March: 17.8 µg/m³Banská Bystrica, 3 March: 23.2 µg/m³Banská Bystrica, 4 March: 23.7 µg/m³Banská Bystrica, 5 March: 4.8 µg/m³Banská Bystrica, 6 March: 10.3 µg/m³Banská Bystrica, 7 March: 32.8 µg/m³, 2.3× its usual 14.1Banská Bystrica, 8 March: 21.5 µg/m³Banská Bystrica, 9 March: 18.7 µg/m³Banská Bystrica, 10 March: 10.9 µg/m³HandlováHandlová, 2 March: 22.6 µg/m³Handlová, 3 March: 26.3 µg/m³Handlová, 4 March: 18.3 µg/m³Handlová, 5 March: 5.2 µg/m³Handlová, 6 March: 12.3 µg/m³Handlová, 7 March: 32.2 µg/m³, 2.4× its usual 13.6Handlová, 8 March: 15.6 µg/m³Handlová, 9 March: 7.8 µg/m³Handlová, 10 March: 4.1 µg/m³BolzanoBolzano, 2 March: 12.5 µg/m³Bolzano, 3 March: 9.7 µg/m³Bolzano, 4 March: 10.4 µg/m³Bolzano, 5 March: 19.2 µg/m³Bolzano, 6 March: 20.4 µg/m³Bolzano, 7 March: 27.7 µg/m³, 2.6× its usual 10.8Bolzano, 8 March: 18.6 µg/m³Bolzano, 9 March: 13.2 µg/m³Bolzano, 10 March: 16.3 µg/m³MariborMaribor, 2 March: 13.7 µg/m³Maribor, 3 March: 19.7 µg/m³Maribor, 4 March: 22.6 µg/m³Maribor, 5 March: 22.2 µg/m³Maribor, 6 March: 27.0 µg/m³Maribor, 7 March: 27.3 µg/m³, 2.0× its usual 13.5Maribor, 8 March: 14.3 µg/m³Maribor, 9 March: 8.2 µg/m³Maribor, 10 March: 10.1 µg/m³2 Mar345678910
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
BihaćFederation of B&H, Bosnia and Herzegovina1 68.35 March25.02.7×
Novo MestoUrban Municipality of Novo Mesto, Slovenia2 45.65 March16.72.7×
BolzanoTrentino-Alto Adige, Italy1 27.77 March10.82.6×
HandlováTrenčín Region, Slovakia1 32.27 March13.62.4×
LjubljanaLjubljana, Slovenia2 37.96 March16.62.3×
TrbovljeMunicipality of Trbovlje, Slovenia3 37.85 March16.42.3×
KranjUrban Municipality of Kranj, Slovenia1 36.86 March15.72.3×
Banská BystricaBanská Bystrica Region, Slovakia1 32.87 March14.12.3×
PtujUrban Municipality of Ptuj, Slovenia1 39.56 March18.02.2×
MariborUrban Municipality of Maribor, Slovenia1 27.37 March13.52.0×

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 Slovenia and Slovakia

Number 9 of 10 episodes in Slovenia and Slovakia since our records began, by cities reached.

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

Use this page

SmogRank, Slovenia, Slovakia and 2 more countries, March 2023: 10 cities with PM2.5 at twice their usual or more, 5 to 7 March 2023, smogrank.com/episodes/2023-03-slovenia-slovakia-and-2-more-countries (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.