SmogRank / History / City race

Cities in Czechia, 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 30 days to19 Dec 2023 That day's board

The worst cities in Czechia for PM2.5 over the 30 days to 19 Dec 2023: Bohumín 28.4 µg/m³, Havířov 27.8 µg/m³ and Český Těšín 27.7 µg/m³.

  1. 1BohumínMoravian-Silesian Region28.4
  2. 2HavířovMoravian-Silesian Region27.8
  3. 3Český TěšínMoravian-Silesian Region27.7
  4. 4OstravaMoravian-Silesian Region26.4
  5. 5Frýdek-MístekMoravian-Silesian Region25.7
  6. 6StudénkaMoravian-Silesian Region24.8
  7. 7Moravská TřebováPardubice Region23.7
  8. 8Valašské MeziříčíZlín23.0
  9. 9TřinecMoravian-Silesian Region22.8
  10. 10OpavaMoravian-Silesian Region22.8
  11. 11DěčínÚstí nad Labem Region22.8
  12. 12PřerovOlomouc Region22.6
  13. 13OlomoucOlomouc Region21.7
  14. 14TepliceÚstí nad Labem Region19.4
  15. 15BerounCentral Bohemia19.4
  16. 16LitvínovÚstí nad Labem Region18.9
  17. 17MostÚstí nad Labem Region18.6
  18. 18Ústí nad LabemÚstí nad Labem Region18.4
  19. 19Mladá BoleslavCentral Bohemia18.4
  20. 20České BudějoviceSouth Bohemian Region18.4

+ 14 more cities, 18.2 µg/m³ and below

Not counted on this day, too few days measured: Rokycany since 13 Nov 2023 and Kladno since 25 Oct 2023.

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.