Bad-air episodes in Italy
10 times since January 2023, many cities in Italy had air at least twice as dirty as their usual for the time of year on the same days. The largest reached 604 cities: Central Europe, February 2023.
2023
- Spain, France and Italy, December 202325 to 31 December 2023, 7 days50 cities99Manlleu
- Southern Europe, December 202316 to 21 December 2023, 6 days97 cities230Sarajevo
- South-eastern Europe, December 202311 to 13 December 2023, 3 days16 cities161Sarajevo
- Italy and France, November 202319 to 20 November 2023, 2 days8 cities55Montemurlo
- Eastern Europe, September 20238 to 13 September 2023, 6 days51 cities42Łuków
- Eastern Europe, March 202319 to 22 March 2023, 4 days56 cities72Kościan
- Slovenia and Slovakia, March 20235 to 7 March 2023, 3 days10 cities68Bihać
- Central Europe, February and March 202328 February to 4 March 2023, 5 days274 cities148Radomsko
- Central Europe, February 20236 to 25 February 2023, 20 days604 cities137Banja Luka
- Campania and Apulia, Italy, February 202325 February 2023, 1 day10 cities100Marigliano
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.