SmogRank / Episodes / Slovenia
South-eastern Europe, June 2024
For 2 days, from 21 to 22 June 2024, 27 cities in Slovenia, North Macedonia, Serbia and 2 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Sarajevo, Federation of B&H, Bosnia and Herzegovina: 49.5 µg/m³ on 22 June, about 3.2× its usual 15.7.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 27 in 5 countries
Days 2 21 to 22 June 2024
Worst day 21 June 26 cities counted
Furthest above usual 7.4× Koper
Day by day
Play 21 June 26 cities at twice their usual or more
Pécs Futog Novi Sad Jesi Obrenovac Čačak Wolfsberg Pejë Sremčica Klagenfurt am Wörthersee Zemun Belgrade Dunaújváros Kraljevo Pančevo Kragujevac Szeged Mitrovicë Smederevo Prizren Glogovac Kosovo Polje Pristina Ćuprija Gjilan Skopje Niš Bor Pirot Rovereto Strumica Sofia Thessaloníki Pylaía Lazarevac Valjevo Tetovo Trento Novi Pazar Bitola Užice Falconara Marittima Bolzano Veles Gostivar Kavadarci Sarajevo Travnik Ilinden Kranj Banja Luka Ljubljana Maribor Gorizia Trbovlje Ptuj Celje Kochani Bihać Novo Mesto Koper 18 Jun 19 20 21 22 23 24 25 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
Sarajevo Sarajevo, 18 June: 27.4 µg/m³, 1.7× usual Sarajevo, 19 June: 24.6 µg/m³, 1.6× usual Sarajevo, 20 June: 39.7 µg/m³, 2.5× usual Sarajevo, 21 June: 49.0 µg/m³, 3.1× usual Sarajevo, 22 June: 49.5 µg/m³, 3.2× usual Sarajevo, 23 June: 40.7 µg/m³, 2.6× usual Sarajevo, 24 June: 32.6 µg/m³, 2.1× usual Sarajevo, 25 June: 33.4 µg/m³, 2.1× usual Bitola Bitola, 18 June: 12.3 µg/m³, 1.1× usual Bitola, 19 June: 16.3 µg/m³, 1.5× usual Bitola, 20 June: 30.8 µg/m³, 2.8× usual Bitola, 21 June: 27.1 µg/m³, 2.5× usual Bitola, 22 June: 27.1 µg/m³, 2.5× usual Bitola, 23 June: 23.1 µg/m³, 2.1× usual Bitola, 24 June: 22.4 µg/m³, 2.1× usual Bitola, 25 June: 20.5 µg/m³, 1.9× usual Koper Koper, 18 June: 6.6 µg/m³, 1.1× usual Koper, 19 June: 7.1 µg/m³, 1.2× usual Koper, 20 June: no reading Koper, 21 June: 44.3 µg/m³, 7.4× usual Koper, 22 June: 19.8 µg/m³, 3.3× usual Koper, 23 June: 7.8 µg/m³, 1.3× usual Koper, 24 June: 8.3 µg/m³, 1.4× usual Koper, 25 June: 8.4 µg/m³, 1.4× usual Falconara Marittima Falconara Marittima, 18 June: 14.3 µg/m³, 1.1× usual Falconara Marittima, 19 June: 17.2 µg/m³, 1.3× usual Falconara Marittima, 20 June: no reading Falconara Marittima, 21 June: 33.7 µg/m³, 2.6× usual Falconara Marittima, 22 June: 23.1 µg/m³, 1.8× usual Falconara Marittima, 23 June: 13.0 µg/m³, 1.0× usual Falconara Marittima, 24 June: 16.9 µg/m³, 1.3× usual Falconara Marittima, 25 June: 13.8 µg/m³, 1.1× usual Bihać Bihać, 18 June: 6.5 µg/m³, 0.9× usual Bihać, 19 June: 8.5 µg/m³, 1.2× usual Bihać, 20 June: 17.3 µg/m³, 2.4× usual Bihać, 21 June: 33.3 µg/m³, 4.7× usual Bihać, 22 June: 33.6 µg/m³, 4.7× usual Bihać, 23 June: 7.8 µg/m³, 1.1× usual Bihać, 24 June: 9.4 µg/m³, 1.3× usual Bihać, 25 June: 11.0 µg/m³, 1.5× usual Gostivar Gostivar, 18 June: 15.3 µg/m³, 1.4× usual Gostivar, 19 June: 16.9 µg/m³, 1.5× usual Gostivar, 20 June: 20.6 µg/m³, 1.9× usual Gostivar, 21 June: 32.7 µg/m³, 2.9× usual Gostivar, 22 June: 30.5 µg/m³, 2.7× usual Gostivar, 23 June: no reading Gostivar, 24 June: no reading Gostivar, 25 June: no reading Banja Luka Banja Luka, 18 June: 11.6 µg/m³, 1.2× usual Banja Luka, 19 June: 13.1 µg/m³, 1.3× usual Banja Luka, 20 June: 19.0 µg/m³, 1.9× usual Banja Luka, 21 June: 30.8 µg/m³, 3.1× usual Banja Luka, 22 June: 36.8 µg/m³, 3.7× usual Banja Luka, 23 June: 9.4 µg/m³, 0.9× usual Banja Luka, 24 June: 11.7 µg/m³, 1.2× usual Banja Luka, 25 June: 11.6 µg/m³, 1.2× usual Gorizia Gorizia, 18 June: 7.9 µg/m³, 1.0× usual Gorizia, 19 June: 8.2 µg/m³, 1.1× usual Gorizia, 20 June: no reading Gorizia, 21 June: 30.5 µg/m³, 4.0× usual Gorizia, 22 June: 24.7 µg/m³, 3.2× usual Gorizia, 23 June: 8.0 µg/m³, 1.0× usual Gorizia, 24 June: 8.3 µg/m³, 1.1× usual Gorizia, 25 June: 9.2 µg/m³, 1.2× usual Celje Celje, 18 June: 9.4 µg/m³, 1.4× usual Celje, 19 June: 9.3 µg/m³, 1.3× usual Celje, 20 June: no reading Celje, 21 June: 30.4 µg/m³, 4.4× usual Celje, 22 June: 25.3 µg/m³, 3.7× usual Celje, 23 June: 6.2 µg/m³, 0.9× usual Celje, 24 June: 8.4 µg/m³, 1.2× usual Celje, 25 June: 9.0 µg/m³, 1.3× usual Ljubljana Ljubljana, 18 June: 9.4 µg/m³, 1.2× usual Ljubljana, 19 June: 7.7 µg/m³, 1.0× usual Ljubljana, 20 June: no reading Ljubljana, 21 June: 30.1 µg/m³, 3.9× usual Ljubljana, 22 June: 26.7 µg/m³, 3.5× usual Ljubljana, 23 June: 6.3 µg/m³, 0.8× usual Ljubljana, 24 June: 8.3 µg/m³, 1.1× usual Ljubljana, 25 June: 8.2 µg/m³, 1.1× usual Kranj Kranj, 18 June: 9.1 µg/m³, 1.1× usual Kranj, 19 June: 10.1 µg/m³, 1.2× usual Kranj, 20 June: no reading Kranj, 21 June: 29.6 µg/m³, 3.5× usual Kranj, 22 June: 30.3 µg/m³, 3.6× usual Kranj, 23 June: 6.8 µg/m³, 0.8× usual Kranj, 24 June: 10.2 µg/m³, 1.2× usual Kranj, 25 June: 10.3 µg/m³, 1.2× usual Užice Užice, 18 June: 16.6 µg/m³, 1.3× usual Užice, 19 June: 14.0 µg/m³, 1.1× usual Užice, 20 June: 23.4 µg/m³, 1.9× usual Užice, 21 June: 28.9 µg/m³, 2.3× usual Užice, 22 June: 32.1 µg/m³, 2.6× usual Užice, 23 June: 21.5 µg/m³, 1.7× usual Užice, 24 June: 21.5 µg/m³, 1.7× usual Užice, 25 June: 17.7 µg/m³, 1.4× usual Novo Mesto Novo Mesto, 18 June: 7.8 µg/m³, 1.3× usual Novo Mesto, 19 June: 7.5 µg/m³, 1.3× usual Novo Mesto, 20 June: no reading Novo Mesto, 21 June: 28.0 µg/m³, 4.7× usual Novo Mesto, 22 June: 29.3 µg/m³, 4.9× usual Novo Mesto, 23 June: 5.3 µg/m³, 0.9× usual Novo Mesto, 24 June: 8.6 µg/m³, 1.4× usual Novo Mesto, 25 June: 8.3 µg/m³, 1.4× usual Ptuj Ptuj, 18 June: 12.1 µg/m³, 1.8× usual Ptuj, 19 June: 9.7 µg/m³, 1.4× usual Ptuj, 20 June: no reading Ptuj, 21 June: 28.0 µg/m³, 4.2× usual Ptuj, 22 June: 19.2 µg/m³, 2.9× usual Ptuj, 23 June: 5.3 µg/m³, 0.8× usual Ptuj, 24 June: 7.1 µg/m³, 1.1× usual Ptuj, 25 June: 9.1 µg/m³, 1.4× usual Valjevo Valjevo, 18 June: no reading Valjevo, 19 June: 14.0 µg/m³, 1.0× usual Valjevo, 20 June: 19.1 µg/m³, 1.4× usual Valjevo, 21 June: 27.9 µg/m³, 2.0× usual Valjevo, 22 June: 30.7 µg/m³, 2.2× usual Valjevo, 23 June: 16.8 µg/m³, 1.2× usual Valjevo, 24 June: 18.0 µg/m³, 1.3× usual Valjevo, 25 June: 15.1 µg/m³, 1.1× usual Trbovlje Trbovlje, 18 June: 8.5 µg/m³, 1.3× usual Trbovlje, 19 June: 8.1 µg/m³, 1.2× usual Trbovlje, 20 June: no reading Trbovlje, 21 June: 27.8 µg/m³, 4.1× usual Trbovlje, 22 June: 24.8 µg/m³, 3.7× usual Trbovlje, 23 June: 5.2 µg/m³, 0.8× usual Trbovlje, 24 June: 8.7 µg/m³, 1.3× usual Trbovlje, 25 June: 8.0 µg/m³, 1.2× usual Trento Trento, 18 June: 13.2 µg/m³, 1.1× usual Trento, 19 June: 14.5 µg/m³, 1.2× usual Trento, 20 June: no reading Trento, 21 June: 27.7 µg/m³, 2.3× usual Trento, 22 June: 11.2 µg/m³, 0.9× usual Trento, 23 June: 7.3 µg/m³, 0.6× usual Trento, 24 June: 6.5 µg/m³, 0.5× usual Trento, 25 June: 10.6 µg/m³, 0.9× usual Maribor Maribor, 18 June: 10.7 µg/m³, 1.5× usual Maribor, 19 June: 12.7 µg/m³, 1.8× usual Maribor, 20 June: no reading Maribor, 21 June: 27.1 µg/m³, 3.9× usual Maribor, 22 June: 20.9 µg/m³, 3.0× usual Maribor, 23 June: 5.4 µg/m³, 0.8× usual Maribor, 24 June: 7.9 µg/m³, 1.1× usual Maribor, 25 June: 8.8 µg/m³, 1.3× usual Travnik Travnik, 18 June: 12.0 µg/m³, 1.4× usual Travnik, 19 June: 13.5 µg/m³, 1.6× usual Travnik, 20 June: 18.9 µg/m³, 2.2× usual Travnik, 21 June: 27.0 µg/m³, 3.2× usual Travnik, 22 June: 28.3 µg/m³, 3.3× usual Travnik, 23 June: 18.6 µg/m³, 2.2× usual Travnik, 24 June: 11.4 µg/m³, 1.3× usual Travnik, 25 June: 11.0 µg/m³, 1.3× usual Kavadarci Kavadarci, 18 June: 12.4 µg/m³, 1.3× usual Kavadarci, 19 June: 11.8 µg/m³, 1.3× usual Kavadarci, 20 June: no reading Kavadarci, 21 June: 26.8 µg/m³, 2.9× usual Kavadarci, 22 June: 19.7 µg/m³, 2.1× usual Kavadarci, 23 June: 14.5 µg/m³, 1.5× usual Kavadarci, 24 June: 17.9 µg/m³, 1.9× usual Kavadarci, 25 June: 10.9 µg/m³, 1.2× usual Kochani Kochani, 18 June: 6.8 µg/m³, 1.2× usual Kochani, 19 June: 9.2 µg/m³, 1.6× usual Kochani, 20 June: 21.0 µg/m³, 3.6× usual Kochani, 21 June: 26.7 µg/m³, 4.6× usual Kochani, 22 June: 17.1 µg/m³, 2.9× usual Kochani, 23 June: 16.5 µg/m³, 2.8× usual Kochani, 24 June: 11.9 µg/m³, 2.1× usual Kochani, 25 June: 8.3 µg/m³, 1.4× usual Novi Pazar Novi Pazar, 18 June: 14.7 µg/m³, 1.2× usual Novi Pazar, 19 June: 13.1 µg/m³, 1.1× usual Novi Pazar, 20 June: 20.1 µg/m³, 1.6× usual Novi Pazar, 21 June: 26.6 µg/m³, 2.2× usual Novi Pazar, 22 June: 28.3 µg/m³, 2.3× usual Novi Pazar, 23 June: 27.4 µg/m³, 2.2× usual Novi Pazar, 24 June: 18.7 µg/m³, 1.5× usual Novi Pazar, 25 June: 15.1 µg/m³, 1.2× usual Bolzano Bolzano, 18 June: 14.1 µg/m³, 1.5× usual Bolzano, 19 June: 14.6 µg/m³, 1.5× usual Bolzano, 20 June: no reading Bolzano, 21 June: 26.3 µg/m³, 2.7× usual Bolzano, 22 June: 7.9 µg/m³, 0.8× usual Bolzano, 23 June: 2.8 µg/m³, 0.3× usual Bolzano, 24 June: 6.9 µg/m³, 0.7× usual Bolzano, 25 June: 10.7 µg/m³, 1.1× usual Lazarevac Lazarevac, 18 June: 14.1 µg/m³, 1.1× usual Lazarevac, 19 June: 15.3 µg/m³, 1.2× usual Lazarevac, 20 June: 19.7 µg/m³, 1.6× usual Lazarevac, 21 June: 25.9 µg/m³, 2.1× usual Lazarevac, 22 June: 25.7 µg/m³, 2.1× usual Lazarevac, 23 June: 16.3 µg/m³, 1.3× usual Lazarevac, 24 June: 17.8 µg/m³, 1.4× usual Lazarevac, 25 June: 14.4 µg/m³, 1.2× usual Ilinden Ilinden, 18 June: 8.3 µg/m³, 1.1× usual Ilinden, 19 June: 18.6 µg/m³, 2.5× usual Ilinden, 20 June: 14.1 µg/m³, 1.9× usual Ilinden, 21 June: 25.6 µg/m³, 3.5× usual Ilinden, 22 June: 19.2 µg/m³, 2.6× usual Ilinden, 23 June: 16.3 µg/m³, 2.2× usual Ilinden, 24 June: 53.5 µg/m³, 7.3× usual Ilinden, 25 June: 8.1 µg/m³, 1.1× usual Veles Veles, 18 June: 12.3 µg/m³, 1.4× usual Veles, 19 June: 11.7 µg/m³, 1.3× usual Veles, 20 June: 17.2 µg/m³, 1.9× usual Veles, 21 June: 25.0 µg/m³, 2.8× usual Veles, 22 June: 18.6 µg/m³, 2.1× usual Veles, 23 June: 14.6 µg/m³, 1.6× usual Veles, 24 June: 14.1 µg/m³, 1.6× usual Veles, 25 June: 11.2 µg/m³, 1.2× usual Tetovo Tetovo, 18 June: 11.6 µg/m³, 1.0× usual Tetovo, 19 June: 14.3 µg/m³, 1.3× usual Tetovo, 20 June: 18.0 µg/m³, 1.6× usual Tetovo, 21 June: 22.8 µg/m³, 2.0× usual Tetovo, 22 June: 25.4 µg/m³, 2.3× usual Tetovo, 23 June: 22.1 µg/m³, 2.0× usual Tetovo, 24 June: 22.9 µg/m³, 2.0× usual Tetovo, 25 June: 16.8 µg/m³, 1.5× usual 18 Jun 19 20 21 22 23 24 25 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. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Koper Urban Municipality of Koper, Slovenia 1 21 June 6.0 7.4× Ilinden Ilinden, North Macedonia 1 24 June 7.3 7.3× Novo Mesto Urban Municipality of Novo Mesto, Slovenia 2 22 June 6.0 4.9× Bihać Federation of B&H, Bosnia and Herzegovina 2 22 June 7.1 4.7× Kochani Kochani, North Macedonia 1 21 June 5.8 4.6× Celje Urban Municipality of Celje, Slovenia 2 21 June 6.9 4.4× Ptuj Urban Municipality of Ptuj, Slovenia 1 21 June 6.7 4.2× Trbovlje Municipality of Trbovlje, Slovenia 1 21 June 6.7 4.1× Gorizia Friuli Venezia Giulia, Italy 1 21 June 7.7 4.0× Ljubljana Ljubljana, Slovenia 2 21 June 7.7 3.9× Maribor Urban Municipality of Maribor, Slovenia 1 21 June 7.0 3.9× Banja Luka Srpska, Bosnia and Herzegovina 2 22 June 10.0 3.7× Kranj Urban Municipality of Kranj, Slovenia 2 22 June 8.4 3.6× Travnik Federation of B&H, Bosnia and Herzegovina 2 22 June 8.5 3.3× Sarajevo Federation of B&H, Bosnia and Herzegovina 2 22 June 15.7 3.2× Gostivar Gostivar, North Macedonia 2 21 June 11.1 2.9× Kavadarci Kavadarci, North Macedonia 1 21 June 9.4 2.9× Bitola Bitola, North Macedonia 2 20 June 10.9 2.8× Veles Veles, North Macedonia 1 21 June 9.0 2.8× Bolzano Trentino-Alto Adige, Italy 1 21 June 9.7 2.7× Falconara Marittima The Marches, Italy 1 21 June 12.8 2.6× Užice Central Serbia, Serbia 2 22 June 12.5 2.6× Trento Trentino-Alto Adige, Italy 1 21 June 12.0 2.3× Novi Pazar Central Serbia, Serbia 2 22 June 12.3 2.3× Tetovo Tetovo, North Macedonia 1 22 June 11.2 2.3× Valjevo Central Serbia, Serbia 2 22 June 13.7 2.2× Lazarevac Central Serbia, Serbia 2 21 June 12.3 2.1×
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 Slovenia and North Macedonia
Number 2 of 5 episodes in Slovenia and North Macedonia since our records began, by cities reached.
Bars: cities reached; colour: the level of the episode's highest daily reading.
Use this page SmogRank, South-eastern Europe, June 2024: 27 cities with PM2.5 at twice their usual or more, 21 to 22 June 2024, smogrank.com/episodes/2024-06-south-eastern-europe (accessed 3 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.
