SmogRank / History / City race
Cities, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities for PM2.5 over the 30 days to 1 Apr 2023: Banja Luka 30.0 µg/m³, Kościan 25.7 µg/m³ and Włocławek 24.3 µg/m³.
- 1Banja LukaBosnia and Herzegovina30.0
- 2KościanPoland25.7
- 3WłocławekPoland24.3
- 4LublinPoland24.0
- 5OtwockPoland23.4
- 6SiedlcePoland22.0
- 7Jastrzębie ZdrójPoland21.2
- 8ŁaskPoland20.7
- 9KrakówPoland20.6
- 10WawerPoland19.8
- 11RacibórzPoland19.7
- 12KutnoPoland19.6
- 13Czechowice-DziedzicePoland19.6
- 14AugustówPoland19.4
- 15BelgradeSerbia19.4
- 16BucharestRomania18.9
- 17Spišská Nová VesSlovakia18.9
- 18ŁukówPoland18.9
- 19RadomPoland18.8
- 20ToruńPoland18.7
+ 971 more cities, the next at 18.6 µg/m³
Not counted on this day, too few days measured: Voluntari since 30 Mar 2023, Popeşti-Leordeni since 30 Mar 2023, Buftea since 30 Mar 2023 and 82 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.