SmogRank / Episodes / Serbia
Serbia, April 2023
For 5 days, from 7 to 11 April 2023, 19 cities in Serbia, Kosovo, Croatia and 1 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Valjevo, Central Serbia, Serbia: 72.0 µg/m³ on 8 April, about 2.9× its usual 25.1.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 19 in 4 countries
Days 5 7 to 11 April 2023
Worst day 8 April 18 cities counted
Furthest above usual 5.4× Pristina
Day by day
Play 8 April 18 cities at twice their usual or more
Ćuprija Užice Szeged Craiova Sofia Pécs Sevlievo Banja Luka Gabrovo Ruse Bucharest Dimitrovgrad Haskovo Bor Sremčica Niš Novi Pazar Pirot Valjevo Čačak Botevgrad Belgrade Obrenovac Kragujevac Futog Lazarevac Zemun Liberpolis Novi Sad Pančevo Smederevo Pristina 4 Apr 5 6 7 8 9 10 11 12 13 14 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
Pristina Pristina, 4 April: 24.8 µg/m³, 2.6× usual Pristina, 5 April: 31.8 µg/m³, 3.3× usual Pristina, 6 April: 36.3 µg/m³, 3.7× usual Pristina, 7 April: 52.1 µg/m³, 5.4× usual Pristina, 8 April: 41.3 µg/m³, 4.3× usual Pristina, 9 April: 32.0 µg/m³, 3.3× usual Pristina, 10 April: 28.6 µg/m³, 2.9× usual Pristina, 11 April: 35.6 µg/m³, 3.7× usual Pristina, 12 April: 31.6 µg/m³, 3.3× usual Pristina, 13 April: 36.9 µg/m³, 3.8× usual Pristina, 14 April: 26.3 µg/m³, 2.7× usual Niš Niš, 4 April: 13.1 µg/m³, 0.7× usual Niš, 5 April: 21.9 µg/m³, 1.2× usual Niš, 6 April: 38.5 µg/m³, 2.1× usual Niš, 7 April: 50.5 µg/m³, 2.8× usual Niš, 8 April: 38.8 µg/m³, 2.1× usual Niš, 9 April: 40.0 µg/m³, 2.2× usual Niš, 10 April: 27.2 µg/m³, 1.5× usual Niš, 11 April: 33.7 µg/m³, 1.9× usual Niš, 12 April: 24.1 µg/m³, 1.3× usual Niš, 13 April: 22.4 µg/m³, 1.2× usual Niš, 14 April: 18.9 µg/m³, 1.0× usual Novi Pazar Novi Pazar, 4 April: 27.1 µg/m³, 1.1× usual Novi Pazar, 5 April: 29.9 µg/m³, 1.2× usual Novi Pazar, 6 April: no reading Novi Pazar, 7 April: 57.4 µg/m³, 2.3× usual Novi Pazar, 8 April: 56.2 µg/m³, 2.2× usual Novi Pazar, 9 April: 71.0 µg/m³, 2.8× usual Novi Pazar, 10 April: 35.3 µg/m³, 1.4× usual Novi Pazar, 11 April: 58.1 µg/m³, 2.3× usual Novi Pazar, 12 April: 40.2 µg/m³, 1.6× usual Novi Pazar, 13 April: no reading Novi Pazar, 14 April: no reading Pirot Pirot, 4 April: 18.5 µg/m³, 1.0× usual Pirot, 5 April: 23.3 µg/m³, 1.2× usual Pirot, 6 April: no reading Pirot, 7 April: 52.1 µg/m³, 2.8× usual Pirot, 8 April: 50.6 µg/m³, 2.7× usual Pirot, 9 April: 35.6 µg/m³, 1.9× usual Pirot, 10 April: 35.8 µg/m³, 1.9× usual Pirot, 11 April: 27.0 µg/m³, 1.4× usual Pirot, 12 April: 22.7 µg/m³, 1.2× usual Pirot, 13 April: no reading Pirot, 14 April: no reading Kragujevac Kragujevac, 4 April: 16.0 µg/m³, 0.9× usual Kragujevac, 5 April: 20.6 µg/m³, 1.2× usual Kragujevac, 6 April: no reading Kragujevac, 7 April: 50.8 µg/m³, 3.0× usual Kragujevac, 8 April: 42.8 µg/m³, 2.5× usual Kragujevac, 9 April: 39.5 µg/m³, 2.3× usual Kragujevac, 10 April: 38.2 µg/m³, 2.2× usual Kragujevac, 11 April: 36.6 µg/m³, 2.2× usual Kragujevac, 12 April: 15.3 µg/m³, 0.9× usual Kragujevac, 13 April: no reading Kragujevac, 14 April: no reading Lazarevac Lazarevac, 4 April: 16.3 µg/m³, 0.8× usual Lazarevac, 5 April: 22.2 µg/m³, 1.2× usual Lazarevac, 6 April: no reading Lazarevac, 7 April: 41.8 µg/m³, 2.2× usual Lazarevac, 8 April: 62.2 µg/m³, 3.2× usual Lazarevac, 9 April: 62.4 µg/m³, 3.2× usual Lazarevac, 10 April: 46.4 µg/m³, 2.4× usual Lazarevac, 11 April: 41.6 µg/m³, 2.2× usual Lazarevac, 12 April: 17.3 µg/m³, 0.9× usual Lazarevac, 13 April: no reading Lazarevac, 14 April: no reading Pančevo Pančevo, 4 April: 13.2 µg/m³, 0.8× usual Pančevo, 5 April: 18.8 µg/m³, 1.2× usual Pančevo, 6 April: no reading Pančevo, 7 April: 41.4 µg/m³, 2.6× usual Pančevo, 8 April: 53.0 µg/m³, 3.4× usual Pančevo, 9 April: 46.7 µg/m³, 3.0× usual Pančevo, 10 April: 29.9 µg/m³, 1.9× usual Pančevo, 11 April: 26.4 µg/m³, 1.7× usual Pančevo, 12 April: 10.2 µg/m³, 0.6× usual Pančevo, 13 April: no reading Pančevo, 14 April: no reading Zemun Zemun, 4 April: 16.2 µg/m³, 1.0× usual Zemun, 5 April: 19.8 µg/m³, 1.2× usual Zemun, 6 April: no reading Zemun, 7 April: 36.9 µg/m³, 2.2× usual Zemun, 8 April: 52.1 µg/m³, 3.2× usual Zemun, 9 April: 42.6 µg/m³, 2.6× usual Zemun, 10 April: 37.8 µg/m³, 2.3× usual Zemun, 11 April: 30.8 µg/m³, 1.9× usual Zemun, 12 April: 13.3 µg/m³, 0.8× usual Zemun, 13 April: no reading Zemun, 14 April: no reading Smederevo Smederevo, 4 April: 10.7 µg/m³, 0.6× usual Smederevo, 5 April: 17.3 µg/m³, 1.0× usual Smederevo, 6 April: no reading Smederevo, 7 April: 35.0 µg/m³, 2.1× usual Smederevo, 8 April: 61.2 µg/m³, 3.6× usual Smederevo, 9 April: 49.7 µg/m³, 2.9× usual Smederevo, 10 April: 27.1 µg/m³, 1.6× usual Smederevo, 11 April: 35.2 µg/m³, 2.1× usual Smederevo, 12 April: 15.1 µg/m³, 0.9× usual Smederevo, 13 April: no reading Smederevo, 14 April: no reading Belgrade Belgrade, 4 April: 13.4 µg/m³, 0.8× usual Belgrade, 5 April: 15.8 µg/m³, 1.0× usual Belgrade, 6 April: 26.8 µg/m³, 1.7× usual Belgrade, 7 April: 34.2 µg/m³, 2.2× usual Belgrade, 8 April: 45.8 µg/m³, 2.9× usual Belgrade, 9 April: 40.4 µg/m³, 2.6× usual Belgrade, 10 April: 30.7 µg/m³, 1.9× usual Belgrade, 11 April: 30.3 µg/m³, 1.9× usual Belgrade, 12 April: 8.8 µg/m³, 0.6× usual Belgrade, 13 April: 13.4 µg/m³, 0.8× usual Belgrade, 14 April: 7.8 µg/m³, 0.5× usual Novi Sad Novi Sad, 4 April: no reading Novi Sad, 5 April: no reading Novi Sad, 6 April: no reading Novi Sad, 7 April: 32.2 µg/m³, 2.5× usual Novi Sad, 8 April: 43.1 µg/m³, 3.4× usual Novi Sad, 9 April: 36.5 µg/m³, 2.9× usual Novi Sad, 10 April: 26.2 µg/m³, 2.1× usual Novi Sad, 11 April: 21.3 µg/m³, 1.7× usual Novi Sad, 12 April: 9.0 µg/m³, 0.7× usual Novi Sad, 13 April: no reading Novi Sad, 14 April: no reading Sremčica Sremčica, 4 April: 11.6 µg/m³, 0.8× usual Sremčica, 5 April: 16.4 µg/m³, 1.1× usual Sremčica, 6 April: no reading Sremčica, 7 April: 32.1 µg/m³, 2.2× usual Sremčica, 8 April: 37.4 µg/m³, 2.5× usual Sremčica, 9 April: 34.9 µg/m³, 2.4× usual Sremčica, 10 April: 31.1 µg/m³, 2.1× usual Sremčica, 11 April: 25.4 µg/m³, 1.7× usual Sremčica, 12 April: 7.7 µg/m³, 0.5× usual Sremčica, 13 April: no reading Sremčica, 14 April: no reading Futog Futog, 4 April: 16.7 µg/m³, 1.3× usual Futog, 5 April: 19.6 µg/m³, 1.6× usual Futog, 6 April: no reading Futog, 7 April: 31.5 µg/m³, 2.5× usual Futog, 8 April: 34.9 µg/m³, 2.8× usual Futog, 9 April: 38.7 µg/m³, 3.1× usual Futog, 10 April: 28.0 µg/m³, 2.2× usual Futog, 11 April: 20.3 µg/m³, 1.6× usual Futog, 12 April: 7.5 µg/m³, 0.6× usual Futog, 13 April: no reading Futog, 14 April: no reading Bor Bor, 4 April: 5.4 µg/m³, 0.4× usual Bor, 5 April: 7.5 µg/m³, 0.6× usual Bor, 6 April: no reading Bor, 7 April: 27.3 µg/m³, 2.1× usual Bor, 8 April: 32.1 µg/m³, 2.5× usual Bor, 9 April: 30.8 µg/m³, 2.4× usual Bor, 10 April: 21.0 µg/m³, 1.6× usual Bor, 11 April: 16.5 µg/m³, 1.3× usual Bor, 12 April: 7.1 µg/m³, 0.5× usual Bor, 13 April: no reading Bor, 14 April: no reading Liberpolis Liberpolis, 4 April: 8.6 µg/m³, 1.1× usual Liberpolis, 5 April: 16.6 µg/m³, 2.2× usual Liberpolis, 6 April: 18.8 µg/m³, 2.4× usual Liberpolis, 7 April: 25.1 µg/m³, 3.3× usual Liberpolis, 8 April: 24.1 µg/m³, 3.1× usual Liberpolis, 9 April: 19.6 µg/m³, 2.5× usual Liberpolis, 10 April: 16.5 µg/m³, 2.1× usual Liberpolis, 11 April: no reading Liberpolis, 12 April: no reading Liberpolis, 13 April: no reading Liberpolis, 14 April: no reading Valjevo Valjevo, 4 April: 29.6 µg/m³, 1.2× usual Valjevo, 5 April: 33.0 µg/m³, 1.3× usual Valjevo, 6 April: no reading Valjevo, 7 April: 43.0 µg/m³, 1.7× usual Valjevo, 8 April: 72.0 µg/m³, 2.9× usual Valjevo, 9 April: 54.9 µg/m³, 2.2× usual Valjevo, 10 April: 47.9 µg/m³, 1.9× usual Valjevo, 11 April: 41.9 µg/m³, 1.7× usual Valjevo, 12 April: 20.9 µg/m³, 0.8× usual Valjevo, 13 April: no reading Valjevo, 14 April: no reading Obrenovac Obrenovac, 4 April: 13.6 µg/m³, 0.8× usual Obrenovac, 5 April: 16.8 µg/m³, 1.0× usual Obrenovac, 6 April: no reading Obrenovac, 7 April: 33.3 µg/m³, 1.9× usual Obrenovac, 8 April: 51.9 µg/m³, 3.0× usual Obrenovac, 9 April: 50.5 µg/m³, 3.0× usual Obrenovac, 10 April: 35.2 µg/m³, 2.1× usual Obrenovac, 11 April: 31.8 µg/m³, 1.9× usual Obrenovac, 12 April: 11.2 µg/m³, 0.7× usual Obrenovac, 13 April: no reading Obrenovac, 14 April: no reading Čačak Čačak, 4 April: 11.2 µg/m³, 0.7× usual Čačak, 5 April: 14.1 µg/m³, 0.9× usual Čačak, 6 April: no reading Čačak, 7 April: 30.7 µg/m³, 1.9× usual Čačak, 8 April: 46.9 µg/m³, 2.9× usual Čačak, 9 April: 38.0 µg/m³, 2.3× usual Čačak, 10 April: 33.2 µg/m³, 2.0× usual Čačak, 11 April: 30.0 µg/m³, 1.8× usual Čačak, 12 April: 10.5 µg/m³, 0.6× usual Čačak, 13 April: no reading Čačak, 14 April: no reading Botevgrad Botevgrad, 4 April: 5.2 µg/m³, 0.5× usual Botevgrad, 5 April: 12.7 µg/m³, 1.3× usual Botevgrad, 6 April: 17.8 µg/m³, 1.8× usual Botevgrad, 7 April: 22.1 µg/m³, 2.3× usual Botevgrad, 8 April: 28.2 µg/m³, 2.9× usual Botevgrad, 9 April: 25.5 µg/m³, 2.6× usual Botevgrad, 10 April: 20.3 µg/m³, 2.1× usual Botevgrad, 11 April: 17.5 µg/m³, 1.8× usual Botevgrad, 12 April: 7.3 µg/m³, 0.7× usual Botevgrad, 13 April: 10.5 µg/m³, 1.1× usual Botevgrad, 14 April: 6.5 µg/m³, 0.7× usual 4 Apr 6 8 10 12 14 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
Pristina Pristina, Kosovo 5 7 April 9.7 5.4× Smederevo Central Serbia, Serbia 4 8 April 17.0 3.6× Novi Sad Vojvodina, Serbia 4 8 April 12.7 3.4× Pančevo Vojvodina, Serbia 3 8 April 15.8 3.4× Liberpolis County of Osijek-Baranja, Croatia 1 7 April 7.7 3.3× Lazarevac Central Serbia, Serbia 5 9 April 19.3 3.2× Zemun Central Serbia, Serbia 4 8 April 16.5 3.2× Futog Vojvodina, Serbia 4 9 April 12.6 3.1× Obrenovac Central Serbia, Serbia 3 8 April 17.1 3.0× Kragujevac Central Serbia, Serbia 5 7 April 17.0 3.0× Belgrade Central Serbia, Serbia 4 8 April 15.8 2.9× Botevgrad Sofia, Bulgaria 2 8 April 9.8 2.9× Čačak Central Serbia, Serbia 3 8 April 16.3 2.9× Valjevo Central Serbia, Serbia 3 8 April 25.1 2.9× Novi Pazar Central Serbia, Serbia 4 9 April 25.1 2.8× Niš Central Serbia, Serbia 3 7 April 18.1 2.8× Pirot Central Serbia, Serbia 2 7 April 18.9 2.8× Sremčica Central Serbia, Serbia 4 8 April 14.7 2.5× Bor Central Serbia, Serbia 3 8 April 13.1 2.5×
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.
Use this page SmogRank, Serbia, April 2023: 19 cities with PM2.5 at twice their usual or more, 7 to 11 April 2023, smogrank.com/episodes/2023-04-serbia (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.
