SmogRank / Episodes / Switzerland / 2025
Bad-air episodes in Switzerland, 2025
In 2025 there were 13 episodes in Switzerland: times when many cities there had air at least twice as dirty as their usual for the time of year on the same days. The largest reached 628 cities: Europe, 1 to 14 February 2025.
14 days. 628 cities; highest daily mean 179 µg/m³ in Banja Luka.
Each bar is an episode: as long as it lasted, as thick as the number of cities it counted, coloured by its highest daily mean. A lane is a part of the world; an episode sits in the lane of the country with most of its cities. Point at a bar or tap one to read it; the years open each year's list.
2025
- Eastern Europe, 16 to 21 December 20256 days129 cities298 µg/m³peak, Banja Luka
- Europe, 22 to 23 November 20252 days59 cities74 µg/m³peak, Żary
- Europe, 8 to 10 November 20253 days84 cities93 µg/m³peak, Żywiec
- Italy and Switzerland, October 202514 October 2025, 1 day9 cities46 µg/m³peak, Nichelino
- Italy and Switzerland, August 202512 to 14 August 2025, 3 days11 cities30 µg/m³peak, Winterthur
- Italy, France and 2 more countries, June 202514 June 2025, 1 day31 cities41 µg/m³peak, Vigevano
- Europe, June 202510 to 12 June 2025, 3 days89 cities49 µg/m³peak, Villefontaine
- Germany, Poland and 25 more countries, March 20253 to 13 March 2025, 11 days553 cities152 µg/m³peak, Negotin
- Europe, 14 February to 1 March 202516 days619 cities178 µg/m³peak, Krotoszyn
- Europe, 1 to 14 February 202514 days628 cities179 µg/m³peak, Banja Luka
- Germany, France and 19 more countries, January 202514 to 24 January 2025, 11 days446 cities252 µg/m³peak, Sarajevo
- Europe, January 202514 to 15 January 2025, 2 days102 cities45 µg/m³peak, Marignane
- Europe, 24 December 2024 to 3 January 202511 days327 cities245 µg/m³peak, Opole
Each row: one bar per day, as tall as the number of cities counted that day and coloured by their median level; the number of cities; the highest daily reading and where. 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.