SmogRank / Episodes / Slovakia
South-eastern Europe, 28 December 2023 to 1 January 2024
For 5 days, from 28 December 2023 to 1 January 2024, 34 cities in Slovakia, Greece, Bulgaria and 7 more countries had PM2.5 at least twice their usual for the time of year. The worst reading was Veles, Veles, North Macedonia: 134.0 µg/m³ on 30 December, about 2.7× its usual 50.1.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 34 in 10 countries
Days 5 28 December 2023 to 1 January 2024
Worst day 29 December 14 cities counted
Furthest above usual 5.1× Pristina
Day by day
Play 29 December 14 cities at twice their usual or more
Belgrade Tetovo Pljevlja Ilinden Podgorica Novi Sad Kochani Bar Kavadarci Bitola Craiova Liberpolis Pécs Dunaújváros Ceglie Messapica Gabrovo Miskolc Veszprém Dej Kazincbarcika Esztergom Košice Győr Vranov nad Topľou Spišská Nová Ves Prešov Humenné Poprad Prievidza Ružomberok Martin Asprópyrgos Karlova Ves Žilina Khalándrion Jasło Baden Mödling Graz Benevento Vienna Perchtoldsdorf Przemyśl Třinec Zlín Klosterneuburg Český Těšín Cieszyn Valašské Meziříčí Frýdek-Místek Salerno Rijeka Havířov Kroměříž Ostrava Přerov Wolfsberg Caserta Sankt Pölten Olomouc Naples Židenice Brno Civitanova Marche Znojmo Klagenfurt am Wörthersee Ancona Falconara Marittima Amstetten Jesi Steyr Ansfelden Linz Wels České Budějovice Passau Pilsen Senica Szeged Trnava Sarajevo Sofia Handlová Nitra Žiar nad Hronom Partizánske Banská Bystrica Zvolen Pátra Skopje Bratislava Traun Banja Luka Snina Botevgrad Cluj-Napoca Volos Piraeus Trenčín Nyíregyháza Thessaloníki Acharnés Ruse Haskovo Niš Veles Pylaía Athens Bucharest Iaşi Pristina 25 Dec 26 27 28 29 30 31 1 Jan 2 3 4 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
Banja Luka Banja Luka, 25 December: 71.4 µg/m³ Banja Luka, 26 December: 108.0 µg/m³ Banja Luka, 27 December: 99.8 µg/m³ Banja Luka, 28 December: 134.0 µg/m³, 2.4× its usual 55.8 Banja Luka, 29 December: 117.0 µg/m³, 2.2× its usual 53.5 Banja Luka, 30 December: 84.3 µg/m³ Banja Luka, 31 December: 26.2 µg/m³ Banja Luka, 1 January: 44.4 µg/m³ Banja Luka, 2 January: 67.1 µg/m³ Banja Luka, 3 January: 5.9 µg/m³ Banja Luka, 4 January: 30.7 µg/m³ Niš Niš, 25 December: 126.5 µg/m³ Niš, 26 December: 87.3 µg/m³ Niš, 27 December: 75.6 µg/m³ Niš, 28 December: 110.5 µg/m³, 2.7× its usual 41.1 Niš, 29 December: 96.6 µg/m³ Niš, 30 December: 93.8 µg/m³, 2.3× its usual 41.1 Niš, 31 December: 92.3 µg/m³, 2.2× its usual 42.3 Niš, 1 January: 59.4 µg/m³ Niš, 2 January: 57.7 µg/m³ Niš, 3 January: 118.0 µg/m³ Niš, 4 January: 68.6 µg/m³ Sarajevo Sarajevo, 25 December: 52.5 µg/m³ Sarajevo, 26 December: 50.9 µg/m³ Sarajevo, 27 December: 72.0 µg/m³ Sarajevo, 28 December: 110.0 µg/m³, 2.2× its usual 50.7 Sarajevo, 29 December: 51.3 µg/m³ Sarajevo, 30 December: 120.0 µg/m³, 2.1× its usual 57.8 Sarajevo, 31 December: 120.0 µg/m³, 2.1× its usual 58.1 Sarajevo, 1 January: 35.4 µg/m³ Sarajevo, 2 January: 37.7 µg/m³ Sarajevo, 3 January: 28.9 µg/m³ Sarajevo, 4 January: 35.4 µg/m³ Pristina Pristina, 25 December: 33.8 µg/m³ Pristina, 26 December: 38.2 µg/m³ Pristina, 27 December: 30.9 µg/m³ Pristina, 28 December: 63.0 µg/m³, 3.4× its usual 18.5 Pristina, 29 December: 55.3 µg/m³ Pristina, 30 December: 81.9 µg/m³, 4.0× its usual 20.4 Pristina, 31 December: 104.0 µg/m³, 5.1× its usual 20.4 Pristina, 1 January: 87.8 µg/m³, 3.3× its usual 26.7 Pristina, 2 January: 25.1 µg/m³ Pristina, 3 January: no reading Pristina, 4 January: 20.9 µg/m³ Nyíregyháza Nyíregyháza, 25 December: 8.5 µg/m³ Nyíregyháza, 26 December: 10.0 µg/m³ Nyíregyháza, 27 December: 15.3 µg/m³ Nyíregyháza, 28 December: 19.2 µg/m³ Nyíregyháza, 29 December: 55.0 µg/m³, 2.6× its usual 21.5 Nyíregyháza, 30 December: 31.7 µg/m³ Nyíregyháza, 31 December: 33.3 µg/m³ Nyíregyháza, 1 January: 13.7 µg/m³ Nyíregyháza, 2 January: 11.4 µg/m³ Nyíregyháza, 3 January: 7.1 µg/m³ Nyíregyháza, 4 January: 8.3 µg/m³ Zvolen Zvolen, 25 December: 5.8 µg/m³ Zvolen, 26 December: 4.9 µg/m³ Zvolen, 27 December: 9.7 µg/m³ Zvolen, 28 December: 23.7 µg/m³ Zvolen, 29 December: 38.7 µg/m³, 2.2× its usual 17.3 Zvolen, 30 December: 31.6 µg/m³ Zvolen, 31 December: 33.5 µg/m³ Zvolen, 1 January: 31.5 µg/m³ Zvolen, 2 January: 12.7 µg/m³ Zvolen, 3 January: 13.1 µg/m³ Zvolen, 4 January: 3.8 µg/m³ Banská Bystrica Banská Bystrica, 25 December: 5.6 µg/m³ Banská Bystrica, 26 December: 5.5 µg/m³ Banská Bystrica, 27 December: 9.0 µg/m³ Banská Bystrica, 28 December: 22.0 µg/m³ Banská Bystrica, 29 December: 35.5 µg/m³, 2.2× its usual 16.5 Banská Bystrica, 30 December: 23.9 µg/m³ Banská Bystrica, 31 December: 29.8 µg/m³ Banská Bystrica, 1 January: 25.9 µg/m³ Banská Bystrica, 2 January: 8.9 µg/m³ Banská Bystrica, 3 January: 12.7 µg/m³ Banská Bystrica, 4 January: 6.0 µg/m³ Traun Traun, 25 December: 3.3 µg/m³ Traun, 26 December: 4.9 µg/m³ Traun, 27 December: 10.0 µg/m³ Traun, 28 December: 25.9 µg/m³ Traun, 29 December: 35.3 µg/m³, 2.3× its usual 15.3 Traun, 30 December: 14.8 µg/m³ Traun, 31 December: 19.1 µg/m³ Traun, 1 January: 14.9 µg/m³ Traun, 2 January: 11.9 µg/m³ Traun, 3 January: 11.2 µg/m³ Traun, 4 January: 1.4 µg/m³ Partizánske Partizánske, 25 December: 5.8 µg/m³ Partizánske, 26 December: 7.5 µg/m³ Partizánske, 27 December: 7.9 µg/m³ Partizánske, 28 December: 21.9 µg/m³ Partizánske, 29 December: 35.2 µg/m³, 2.2× its usual 16.0 Partizánske, 30 December: 32.5 µg/m³, 2.0× its usual 16.2 Partizánske, 31 December: 18.9 µg/m³ Partizánske, 1 January: 16.1 µg/m³ Partizánske, 2 January: 7.9 µg/m³ Partizánske, 3 January: 8.4 µg/m³ Partizánske, 4 January: 2.3 µg/m³ Trnava Trnava, 25 December: 2.4 µg/m³ Trnava, 26 December: 7.7 µg/m³ Trnava, 27 December: 6.7 µg/m³ Trnava, 28 December: 22.9 µg/m³ Trnava, 29 December: 34.4 µg/m³, 2.1× its usual 16.3 Trnava, 30 December: 26.5 µg/m³ Trnava, 31 December: 21.1 µg/m³ Trnava, 1 January: 14.9 µg/m³ Trnava, 2 January: 10.8 µg/m³ Trnava, 3 January: 9.1 µg/m³ Trnava, 4 January: 4.0 µg/m³ Trenčín Trenčín, 25 December: 5.0 µg/m³ Trenčín, 26 December: 9.9 µg/m³ Trenčín, 27 December: 10.4 µg/m³ Trenčín, 28 December: 17.8 µg/m³ Trenčín, 29 December: 33.5 µg/m³, 2.3× its usual 14.4 Trenčín, 30 December: 37.8 µg/m³, 2.6× its usual 14.4 Trenčín, 31 December: 19.5 µg/m³ Trenčín, 1 January: 14.9 µg/m³ Trenčín, 2 January: 10.3 µg/m³ Trenčín, 3 January: 10.3 µg/m³ Trenčín, 4 January: 5.1 µg/m³ Žiar nad Hronom Žiar nad Hronom, 25 December: 1.4 µg/m³ Žiar nad Hronom, 26 December: 2.7 µg/m³ Žiar nad Hronom, 27 December: 6.0 µg/m³ Žiar nad Hronom, 28 December: 15.8 µg/m³ Žiar nad Hronom, 29 December: 31.8 µg/m³, 2.2× its usual 14.7 Žiar nad Hronom, 30 December: 15.1 µg/m³ Žiar nad Hronom, 31 December: 14.8 µg/m³ Žiar nad Hronom, 1 January: 13.5 µg/m³ Žiar nad Hronom, 2 January: 10.4 µg/m³ Žiar nad Hronom, 3 January: 5.0 µg/m³ Žiar nad Hronom, 4 January: 2.9 µg/m³ Szeged Szeged, 25 December: 17.9 µg/m³ Szeged, 26 December: 13.7 µg/m³ Szeged, 27 December: 10.4 µg/m³ Szeged, 28 December: 18.5 µg/m³ Szeged, 29 December: 30.5 µg/m³, 2.1× its usual 14.8 Szeged, 30 December: 30.5 µg/m³, 2.0× its usual 15.1 Szeged, 31 December: 26.8 µg/m³ Szeged, 1 January: 19.1 µg/m³ Szeged, 2 January: 8.7 µg/m³ Szeged, 3 January: 10.7 µg/m³ Szeged, 4 January: 11.8 µg/m³ Handlová Handlová, 25 December: 2.4 µg/m³ Handlová, 26 December: 3.1 µg/m³ Handlová, 27 December: 10.8 µg/m³ Handlová, 28 December: 26.7 µg/m³ Handlová, 29 December: 30.4 µg/m³, 2.2× its usual 13.6 Handlová, 30 December: 26.1 µg/m³ Handlová, 31 December: 12.9 µg/m³ Handlová, 1 January: 11.2 µg/m³ Handlová, 2 January: 6.1 µg/m³ Handlová, 3 January: 4.6 µg/m³ Handlová, 4 January: 2.0 µg/m³ Bratislava Bratislava, 25 December: 2.1 µg/m³ Bratislava, 26 December: 8.4 µg/m³ Bratislava, 27 December: 5.8 µg/m³ Bratislava, 28 December: 15.0 µg/m³ Bratislava, 29 December: 29.1 µg/m³, 2.3× its usual 12.6 Bratislava, 30 December: 16.5 µg/m³ Bratislava, 31 December: 23.9 µg/m³ Bratislava, 1 January: 8.2 µg/m³ Bratislava, 2 January: 9.2 µg/m³ Bratislava, 3 January: 5.8 µg/m³ Bratislava, 4 January: 3.1 µg/m³ Senica Senica, 25 December: 10.6 µg/m³ Senica, 26 December: 4.6 µg/m³ Senica, 27 December: 6.8 µg/m³ Senica, 28 December: 17.0 µg/m³ Senica, 29 December: 27.0 µg/m³, 2.0× its usual 13.5 Senica, 30 December: 18.7 µg/m³ Senica, 31 December: 20.4 µg/m³ Senica, 1 January: 13.7 µg/m³ Senica, 2 January: 9.3 µg/m³ Senica, 3 January: 5.5 µg/m³ Senica, 4 January: 3.1 µg/m³ Snina Snina, 25 December: 7.2 µg/m³ Snina, 26 December: 11.4 µg/m³ Snina, 27 December: 4.6 µg/m³ Snina, 28 December: 11.2 µg/m³ Snina, 29 December: 25.3 µg/m³, 2.5× its usual 10.1 Snina, 30 December: 24.0 µg/m³ Snina, 31 December: 16.0 µg/m³ Snina, 1 January: 8.8 µg/m³ Snina, 2 January: 6.8 µg/m³ Snina, 3 January: 8.3 µg/m³ Snina, 4 January: 8.8 µg/m³ Veles Veles, 25 December: 90.6 µg/m³ Veles, 26 December: 80.1 µg/m³ Veles, 27 December: 43.7 µg/m³ Veles, 28 December: 71.9 µg/m³ Veles, 29 December: 80.7 µg/m³ Veles, 30 December: 134.0 µg/m³, 2.7× its usual 50.1 Veles, 31 December: 126.0 µg/m³, 2.4× its usual 51.9 Veles, 1 January: 89.7 µg/m³ Veles, 2 January: 76.8 µg/m³ Veles, 3 January: 60.5 µg/m³ Veles, 4 January: 60.8 µg/m³ Skopje Skopje, 25 December: 102.5 µg/m³ Skopje, 26 December: 102.4 µg/m³ Skopje, 27 December: 88.1 µg/m³ Skopje, 28 December: 80.6 µg/m³ Skopje, 29 December: 97.4 µg/m³ Skopje, 30 December: 102.6 µg/m³, 2.1× its usual 48.5 Skopje, 31 December: 105.5 µg/m³, 2.1× its usual 49.9 Skopje, 1 January: 109.0 µg/m³, 2.2× its usual 50.3 Skopje, 2 January: 86.1 µg/m³ Skopje, 3 January: 58.3 µg/m³ Skopje, 4 January: 48.2 µg/m³ Iaşi Iaşi, 25 December: 12.0 µg/m³ Iaşi, 26 December: 11.9 µg/m³ Iaşi, 27 December: 17.0 µg/m³ Iaşi, 28 December: 27.7 µg/m³ Iaşi, 29 December: 50.4 µg/m³ Iaşi, 30 December: 67.7 µg/m³, 3.6× its usual 18.6 Iaşi, 31 December: 49.6 µg/m³, 2.6× its usual 18.8 Iaşi, 1 January: 32.6 µg/m³ Iaşi, 2 January: 12.5 µg/m³ Iaşi, 3 January: 17.3 µg/m³ Iaşi, 4 January: 17.3 µg/m³ Botevgrad Botevgrad, 25 December: 10.2 µg/m³ Botevgrad, 26 December: 23.7 µg/m³ Botevgrad, 27 December: 25.9 µg/m³ Botevgrad, 28 December: 34.2 µg/m³ Botevgrad, 29 December: 30.9 µg/m³ Botevgrad, 30 December: 57.3 µg/m³, 2.5× its usual 23.0 Botevgrad, 31 December: 47.4 µg/m³, 2.1× its usual 22.2 Botevgrad, 1 January: 26.4 µg/m³ Botevgrad, 2 January: 21.6 µg/m³ Botevgrad, 3 January: 15.8 µg/m³ Botevgrad, 4 January: 16.8 µg/m³ Thessaloníki Thessaloníki, 25 December: 45.9 µg/m³ Thessaloníki, 26 December: 40.6 µg/m³ Thessaloníki, 27 December: 32.7 µg/m³ Thessaloníki, 28 December: 42.4 µg/m³ Thessaloníki, 29 December: 46.7 µg/m³ Thessaloníki, 30 December: 53.6 µg/m³, 2.1× its usual 25.8 Thessaloníki, 31 December: 47.2 µg/m³ Thessaloníki, 1 January: 65.0 µg/m³, 2.6× its usual 25.4 Thessaloníki, 2 January: 51.5 µg/m³ Thessaloníki, 3 January: 55.3 µg/m³ Thessaloníki, 4 January: 36.4 µg/m³ Cluj-Napoca Cluj-Napoca, 25 December: 20.5 µg/m³ Cluj-Napoca, 26 December: 16.7 µg/m³ Cluj-Napoca, 27 December: 22.7 µg/m³ Cluj-Napoca, 28 December: 37.7 µg/m³ Cluj-Napoca, 29 December: 44.1 µg/m³ Cluj-Napoca, 30 December: 49.4 µg/m³, 2.2× its usual 22.5 Cluj-Napoca, 31 December: 58.0 µg/m³, 2.5× its usual 22.8 Cluj-Napoca, 1 January: 55.4 µg/m³, 2.4× its usual 22.8 Cluj-Napoca, 2 January: 16.0 µg/m³ Cluj-Napoca, 3 January: 15.2 µg/m³ Cluj-Napoca, 4 January: 21.1 µg/m³ Athens Athens, 25 December: 41.9 µg/m³ Athens, 26 December: 42.5 µg/m³ Athens, 27 December: 28.7 µg/m³ Athens, 28 December: 42.1 µg/m³ Athens, 29 December: 48.2 µg/m³ Athens, 30 December: 48.1 µg/m³, 2.5× its usual 18.9 Athens, 31 December: 48.0 µg/m³, 2.5× its usual 19.4 Athens, 1 January: 60.3 µg/m³, 3.0× its usual 19.9 Athens, 2 January: 28.5 µg/m³ Athens, 3 January: 12.2 µg/m³ Athens, 4 January: 11.9 µg/m³ Nitra Nitra, 25 December: 6.1 µg/m³ Nitra, 26 December: 8.7 µg/m³ Nitra, 27 December: 5.7 µg/m³ Nitra, 28 December: 18.4 µg/m³ Nitra, 29 December: 27.4 µg/m³ Nitra, 30 December: 31.8 µg/m³, 2.2× its usual 14.5 Nitra, 31 December: 22.0 µg/m³ Nitra, 1 January: 13.7 µg/m³ Nitra, 2 January: 9.9 µg/m³ Nitra, 3 January: 8.4 µg/m³ Nitra, 4 January: 4.4 µg/m³ Volos Volos, 25 December: 43.0 µg/m³ Volos, 26 December: 36.8 µg/m³ Volos, 27 December: 41.6 µg/m³ Volos, 28 December: 37.5 µg/m³ Volos, 29 December: 40.5 µg/m³ Volos, 30 December: 56.9 µg/m³ Volos, 31 December: 57.6 µg/m³, 2.0× its usual 28.8 Volos, 1 January: 69.9 µg/m³, 2.5× its usual 28.0 Volos, 2 January: 64.2 µg/m³ Volos, 3 January: 39.5 µg/m³ Volos, 4 January: 24.2 µg/m³ Haskovo Haskovo, 25 December: 31.9 µg/m³ Haskovo, 26 December: 25.9 µg/m³ Haskovo, 27 December: 19.6 µg/m³ Haskovo, 28 December: 30.3 µg/m³ Haskovo, 29 December: 41.7 µg/m³ Haskovo, 30 December: 42.9 µg/m³ Haskovo, 31 December: 55.0 µg/m³, 2.0× its usual 27.3 Haskovo, 1 January: 76.1 µg/m³, 2.7× its usual 28.7 Haskovo, 2 January: 72.4 µg/m³ Haskovo, 3 January: 58.6 µg/m³ Haskovo, 4 January: 31.9 µg/m³ Bucharest Bucharest, 25 December: 8.5 µg/m³ Bucharest, 26 December: 11.9 µg/m³ Bucharest, 27 December: 16.4 µg/m³ Bucharest, 28 December: 20.7 µg/m³ Bucharest, 29 December: 28.4 µg/m³ Bucharest, 30 December: 21.6 µg/m³ Bucharest, 31 December: 43.5 µg/m³, 2.5× its usual 17.5 Bucharest, 1 January: 61.3 µg/m³, 3.3× its usual 18.6 Bucharest, 2 January: 17.5 µg/m³ Bucharest, 3 January: 13.6 µg/m³ Bucharest, 4 January: 23.5 µg/m³ Acharnés Acharnés, 25 December: 27.4 µg/m³ Acharnés, 26 December: 21.3 µg/m³ Acharnés, 27 December: 17.5 µg/m³ Acharnés, 28 December: 19.8 µg/m³ Acharnés, 29 December: 25.1 µg/m³ Acharnés, 30 December: 26.3 µg/m³ Acharnés, 31 December: 30.7 µg/m³, 2.2× its usual 13.7 Acharnés, 1 January: 38.5 µg/m³, 2.7× its usual 14.2 Acharnés, 2 January: 23.4 µg/m³ Acharnés, 3 January: 12.1 µg/m³ Acharnés, 4 January: 11.3 µg/m³ Ruse Ruse, 25 December: 8.4 µg/m³ Ruse, 26 December: 15.9 µg/m³ Ruse, 27 December: 9.2 µg/m³ Ruse, 28 December: 35.6 µg/m³ Ruse, 29 December: 20.5 µg/m³ Ruse, 30 December: 18.6 µg/m³ Ruse, 31 December: 30.0 µg/m³ Ruse, 1 January: 49.7 µg/m³, 2.7× its usual 18.7 Ruse, 2 January: 10.6 µg/m³ Ruse, 3 January: 11.4 µg/m³ Ruse, 4 January: no reading Pátra Pátra, 25 December: 19.0 µg/m³ Pátra, 26 December: 23.8 µg/m³ Pátra, 27 December: 26.0 µg/m³ Pátra, 28 December: 28.9 µg/m³ Pátra, 29 December: 29.1 µg/m³ Pátra, 30 December: 29.7 µg/m³ Pátra, 31 December: 39.5 µg/m³ Pátra, 1 January: 48.5 µg/m³, 2.2× its usual 22.4 Pátra, 2 January: no reading Pátra, 3 January: no reading Pátra, 4 January: no reading Piraeus Piraeus, 25 December: 39.3 µg/m³ Piraeus, 26 December: 30.8 µg/m³ Piraeus, 27 December: 18.1 µg/m³ Piraeus, 28 December: 28.6 µg/m³ Piraeus, 29 December: 26.2 µg/m³ Piraeus, 30 December: 28.0 µg/m³ Piraeus, 31 December: 24.7 µg/m³ Piraeus, 1 January: 36.2 µg/m³, 2.6× its usual 14.0 Piraeus, 2 January: 24.8 µg/m³ Piraeus, 3 January: 10.4 µg/m³ Piraeus, 4 January: 8.3 µg/m³ Pylaía Pylaía, 25 December: 9.8 µg/m³ Pylaía, 26 December: 12.5 µg/m³ Pylaía, 27 December: 12.0 µg/m³ Pylaía, 28 December: 13.5 µg/m³ Pylaía, 29 December: 17.9 µg/m³ Pylaía, 30 December: 24.5 µg/m³ Pylaía, 31 December: 20.0 µg/m³ Pylaía, 1 January: 29.3 µg/m³, 2.9× its usual 10.1 Pylaía, 2 January: 19.4 µg/m³ Pylaía, 3 January: 5.5 µg/m³ Pylaía, 4 January: 3.8 µg/m³ Sofia Sofia, 25 December: 10.9 µg/m³ Sofia, 26 December: 14.4 µg/m³ Sofia, 27 December: 7.5 µg/m³ Sofia, 28 December: 18.6 µg/m³ Sofia, 29 December: 20.7 µg/m³ Sofia, 30 December: 15.8 µg/m³ Sofia, 31 December: 14.3 µg/m³ Sofia, 1 January: 27.7 µg/m³, 2.2× its usual 12.6 Sofia, 2 January: 8.9 µg/m³ Sofia, 3 January: 11.5 µg/m³ Sofia, 4 January: 7.2 µg/m³ 25 Dec 27 29 31 1 Jan 2 4 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 4 31 December 20.4 5.1× Iaşi Iași County, Romania 2 30 December 18.6 3.6× Bucharest Bucharest, Romania 2 1 January 18.6 3.3× Athens Attica, Greece 3 1 January 19.9 3.0× Pylaía Central Macedonia, Greece 1 1 January 10.1 2.9× Veles Veles, North Macedonia 2 30 December 50.1 2.7× Niš Central Serbia, Serbia 3 28 December 41.1 2.7× Haskovo Haskovo, Bulgaria 2 1 January 28.7 2.7× Ruse Ruse, Bulgaria 1 1 January 18.7 2.7× Acharnés Attica, Greece 2 1 January 14.2 2.7× Thessaloníki Central Macedonia, Greece 2 1 January 25.4 2.6× Nyíregyháza Szabolcs-Szatmár-Bereg, Hungary 1 29 December 21.5 2.6× Trenčín Trenčín Region, Slovakia 2 30 December 14.4 2.6× Piraeus Attica, Greece 1 1 January 14.0 2.6× Volos Thessaly, Greece 2 1 January 28.0 2.5× Cluj-Napoca Cluj County, Romania 3 31 December 22.8 2.5× Botevgrad Sofia, Bulgaria 2 30 December 23.0 2.5× Snina Prešov Region, Slovakia 1 29 December 10.1 2.5× Banja Luka Srpska, Bosnia and Herzegovina 2 28 December 55.8 2.4× Traun Upper Austria, Austria 1 29 December 15.3 2.3× Bratislava Bratislava Region, Slovakia 1 29 December 12.6 2.3× Skopje Grad Skopje, North Macedonia 3 1 January 50.3 2.2× Pátra West Greece, Greece 1 1 January 22.4 2.2× Zvolen Banská Bystrica Region, Slovakia 1 29 December 17.3 2.2× Banská Bystrica Banská Bystrica Region, Slovakia 1 29 December 16.5 2.2× Partizánske Trenčín Region, Slovakia 2 29 December 16.0 2.2× Žiar nad Hronom Banská Bystrica Region, Slovakia 1 29 December 14.7 2.2× Nitra Nitra Region, Slovakia 1 30 December 14.5 2.2× Handlová Trenčín Region, Slovakia 1 29 December 13.6 2.2× Sofia Sofia-Capital, Bulgaria 1 1 January 12.6 2.2× Sarajevo Federation of B&H, Bosnia and Herzegovina 3 30 December 57.8 2.1× Trnava Trnava Region, Slovakia 1 29 December 16.3 2.1× Szeged Csongrád, Hungary 2 29 December 14.8 2.1× Senica Trnava Region, Slovakia 1 29 December 13.5 2.0×
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 Greece
The largest of 8 episodes in Slovakia and Greece since our records began, by cities reached.
South-eastern Europe, 28 December 2023 to 1 January 2024 34 Eastern Europe, April 2026 23 Germany, Slovakia and 2 more countries, June 2023 19 Eastern Europe, July 2024 17 Slovakia, Czechia and Poland, June 2026 16 South-eastern Europe, 11 to 13 December 2023 16 Eastern Europe, June 2026 14 Czechia, Slovakia and Poland, January 2023 9 Bars: cities reached; colour: the level of the episode's highest daily reading.
Use this page SmogRank, South-eastern Europe, 28 December 2023 to 1 January 2024: 34 cities with PM2.5 at twice their usual or more, 28 December 2023 to 1 January 2024, smogrank.com/episodes/2023-12-28-south-eastern-europe (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.
