Bad-air episodes in Poland
13 times since January 2023, many cities in Poland 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
- Poland, September 202327 September 2023, 1 day8 cities30Olsztyn
- Eastern Europe, September 20238 to 13 September 2023, 6 days51 cities42Łuków
- Germany, Slovakia and 2 more countries, June 202320 to 21 June 2023, 2 days19 cities36Senica
- Poland, May 202325 to 26 May 2023, 2 days10 cities35Lublin
- Poland and Czechia, April 202320 to 22 April 2023, 3 days15 cities38Jastrzębie Zdrój
- Central Europe, April 20239 to 10 April 2023, 2 days65 cities58Jastrzębie Zdrój
- Czechia and Poland, April 20236 to 7 April 2023, 2 days9 cities41Bohumín
- Eastern Europe, March 202319 to 22 March 2023, 4 days56 cities72Kościan
- 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
- Poland and Czechia, January 202318 to 20 January 2023, 3 days15 cities57Lębork
- Eastern Europe, January 20231 to 8 January 2023, 8 days50 cities250Pljevlja
- Czechia and Slovakia, January 20232 January 2023, 1 day9 cities54Ružomberok
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.