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.

CountriesCities
The 7 days to4 Mar 2023 That day's board

The worst cities for PM2.5 over the 7 days to 4 Mar 2023: Radomsko 67.7 µg/m³, Kłodzko 48.4 µg/m³ and Rzeszów 47.0 µg/m³.

  1. 1RadomskoPoland67.7
  2. 2KłodzkoPoland48.4
  3. 3RzeszówPoland47.0
  4. 4Banja LukaBosnia and Herzegovina46.3
  5. 5ŁaskPoland45.6
  6. 6KościanPoland45.5
  7. 7DębicaPoland44.0
  8. 8RacibórzPoland43.7
  9. 9GevgelijaNorth Macedonia42.6
  10. 10KaliszPoland41.8
  11. 11StarachowicePoland40.3
  12. 12Frýdek-MístekCzechia40.1
  13. 13OtwockPoland39.8
  14. 14MielecPoland39.3
  15. 15BohumínCzechia39.3
  16. 16Wodzisław ŚląskiPoland39.3
  17. 17TarnówPoland39.2
  18. 18Jastrzębie ZdrójPoland39.2
  19. 19BihaćBosnia and Herzegovina39.2
  20. 20Bielsko-BialaPoland38.2

+ 1,176 more cities, 36.7 µg/m³ and below

Not counted on this day, too few days measured: Pátra since 22 Feb 2023, Codlea since 17 Feb 2023, Ashgabat since 4 Feb 2023 and 52 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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 and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.