SmogRank / Episodes / Montenegro

Montenegro, Bosnia and Herzegovina and Serbia, September 2026

For 2 days, from 9 to 10 September 2026, 10 cities in Montenegro, Bosnia and Herzegovina, Serbia and 1 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Pljevlja, Pljevlja, Montenegro: 97.6 µg/m³ on 9 September, about 9.5× its usual 10.3.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 4 countries
Days29 to 10 September 2026
Worst day9 September7 cities counted
Furthest above usual13×Nikšić

Day by day

9 September 7 cities at twice their usual or more
TrebinjeObrenovacBelgradeNovi SadSmederevoGostivarSkopjeKikindaNišOhridPrijedorIlindenKumanovoVelesTimişoaraPrilepBitolaKavadarciKochaniCalafatZagrebStrumicaGevgelijaSofiaTârgu JiuNovo MestoBotevgradCraiovaBeneventoSan Felice A CancelloCasertaAcerraAnconaKoperUžiceTetovoBanja LukaSarajevoNovi PazarBarBijelo PoljePodgoricaPljevljaNikšić
6 Sep78910111213
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

NikšićNikšić, 6 September: 33.4 µg/m³, 6.3× usualNikšić, 7 September: 26.3 µg/m³, 5.0× usualNikšić, 8 September: 75.7 µg/m³, 14× usualNikšić, 9 September: 55.6 µg/m³, 10× usualNikšić, 10 September: 67.5 µg/m³, 13× usualNikšić, 11 September: 35.8 µg/m³, 6.8× usualNikšić, 12 September: 12.1 µg/m³, 2.3× usualNikšić, 13 September: no readingPodgoricaPodgorica, 6 September: 26.5 µg/m³, 2.8× usualPodgorica, 7 September: 16.4 µg/m³, 1.7× usualPodgorica, 8 September: 49.7 µg/m³, 5.3× usualPodgorica, 9 September: 53.2 µg/m³, 5.7× usualPodgorica, 10 September: 40.9 µg/m³, 4.4× usualPodgorica, 11 September: 21.8 µg/m³, 2.3× usualPodgorica, 12 September: 13.5 µg/m³, 1.4× usualPodgorica, 13 September: no readingPljevljaPljevlja, 6 September: 8.1 µg/m³, 0.8× usualPljevlja, 7 September: 5.7 µg/m³, 0.6× usualPljevlja, 8 September: 9.5 µg/m³, 0.9× usualPljevlja, 9 September: 97.6 µg/m³, 9.5× usualPljevlja, 10 September: 95.5 µg/m³, 9.3× usualPljevlja, 11 September: 30.7 µg/m³, 3.0× usualPljevlja, 12 September: 7.1 µg/m³, 0.7× usualPljevlja, 13 September: no readingSarajevoSarajevo, 6 September: 3.2 µg/m³, 0.2× usualSarajevo, 7 September: 6.3 µg/m³, 0.3× usualSarajevo, 8 September: 15.8 µg/m³, 0.8× usualSarajevo, 9 September: 38.2 µg/m³, 2.0× usualSarajevo, 10 September: 36.7 µg/m³, 2.0× usualSarajevo, 11 September: 30.0 µg/m³, 1.6× usualSarajevo, 12 September: 7.1 µg/m³, 0.4× usualSarajevo, 13 September: 10.3 µg/m³, 0.5× usualBijelo PoljeBijelo Polje, 6 September: 20.1 µg/m³, 2.9× usualBijelo Polje, 7 September: 13.6 µg/m³, 1.9× usualBijelo Polje, 8 September: 20.0 µg/m³, 2.9× usualBijelo Polje, 9 September: 33.8 µg/m³, 4.8× usualBijelo Polje, 10 September: 30.3 µg/m³, 4.3× usualBijelo Polje, 11 September: 23.8 µg/m³, 3.4× usualBijelo Polje, 12 September: 9.5 µg/m³, 1.4× usualBijelo Polje, 13 September: no readingBarBar, 6 September: 14.9 µg/m³, 2.3× usualBar, 7 September: 15.3 µg/m³, 2.4× usualBar, 8 September: 21.5 µg/m³, 3.3× usualBar, 9 September: 26.2 µg/m³, 4.0× usualBar, 10 September: 15.8 µg/m³, 2.4× usualBar, 11 September: 9.7 µg/m³, 1.5× usualBar, 12 September: 4.3 µg/m³, 0.7× usualBar, 13 September: no readingBanja LukaBanja Luka, 6 September: 5.0 µg/m³, 0.4× usualBanja Luka, 7 September: 8.2 µg/m³, 0.7× usualBanja Luka, 8 September: 9.4 µg/m³, 0.8× usualBanja Luka, 9 September: 25.2 µg/m³, 2.0× usualBanja Luka, 10 September: 15.8 µg/m³, 1.3× usualBanja Luka, 11 September: 11.6 µg/m³, 0.9× usualBanja Luka, 12 September: 7.7 µg/m³, 0.6× usualBanja Luka, 13 September: no readingNovi PazarNovi Pazar, 6 September: no readingNovi Pazar, 7 September: 9.5 µg/m³, 0.7× usualNovi Pazar, 8 September: no readingNovi Pazar, 9 September: 26.2 µg/m³, 1.9× usualNovi Pazar, 10 September: 33.6 µg/m³, 2.5× usualNovi Pazar, 11 September: 20.9 µg/m³, 1.5× usualNovi Pazar, 12 September: 11.3 µg/m³, 0.8× usualNovi Pazar, 13 September: no readingTetovoTetovo, 6 September: no readingTetovo, 7 September: 8.9 µg/m³, 0.6× usualTetovo, 8 September: 17.0 µg/m³, 1.1× usualTetovo, 9 September: 26.3 µg/m³, 1.7× usualTetovo, 10 September: 30.5 µg/m³, 2.0× usualTetovo, 11 September: 21.2 µg/m³, 1.4× usualTetovo, 12 September: 15.3 µg/m³, 1.0× usualTetovo, 13 September: no readingUžiceUžice, 6 September: no readingUžice, 7 September: 7.8 µg/m³, 0.6× usualUžice, 8 September: no readingUžice, 9 September: 20.4 µg/m³, 1.5× usualUžice, 10 September: 26.9 µg/m³, 2.0× usualUžice, 11 September: 16.1 µg/m³, 1.2× usualUžice, 12 September: 10.3 µg/m³, 0.8× usualUžice, 13 September: no reading6 Sep78910111213
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
NikšićOpština Nikšić, Montenegro2 75.78 September5.314×
PljevljaPljevlja, Montenegro2 97.69 September10.39.5×
PodgoricaPodgorica, Montenegro2 53.29 September9.45.7×
Bijelo PoljeBijelo Polje, Montenegro2 33.89 September7.04.8×
BarBar, Montenegro1 26.29 September6.54.0×
Novi PazarCentral Serbia, Serbia1 33.610 September13.62.5×
UžiceCentral Serbia, Serbia1 26.910 September13.22.0×
SarajevoFederation of B&H, Bosnia and Herzegovina1 38.29 September18.82.0×
TetovoTetovo, North Macedonia1 30.510 September15.12.0×
Banja LukaSrpska, Bosnia and Herzegovina1 25.29 September12.52.0×

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.

Use this page

SmogRank, Montenegro, Bosnia and Herzegovina and Serbia, September 2026: 10 cities with PM2.5 at twice their usual or more, 9 to 10 September 2026, smogrank.com/episodes/2026-09-montenegro-bosnia-and-herzegovina-and-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.