SmogRank / Episodes / Switzerland / 2023
Bad-air episodes in Switzerland, 2023
In 2023 there were 5 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 647 cities: Europe, 6 to 25 February 2023.
20 days. 647 cities; highest daily mean 137 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.
2023
- Europe, December 20234 to 9 December 2023, 6 days134 cities115 µg/m³peak, Banja Luka
- Europe, 17 to 22 March 20236 days64 cities72 µg/m³peak, Kościan
- Europe, 4 to 7 March 20234 days121 cities73 µg/m³peak, Bihać
- Europe, 28 February to 4 March 20235 days279 cities148 µg/m³peak, Radomsko
- Europe, 6 to 25 February 202320 days647 cities137 µg/m³peak, Banja Luka
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.