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 to24 Nov 2023 That day's board

The worst cities in Czechia for PM2.5 over the 30 days to 24 Nov 2023: Děčín 13.7 µg/m³, Beroun 11.0 µg/m³ and Olomouc 10.4 µg/m³.

  1. 1DěčínÚstí nad Labem Region13.7
  2. 2BerounCentral Bohemia11.0
  3. 3OlomoucOlomouc Region10.4
  4. 4Moravská TřebováPardubice Region10.2
  5. 5BohumínMoravian-Silesian Region10.1
  6. 6HavířovMoravian-Silesian Region9.9
  7. 7ZnojmoSouth Moravian9.5
  8. 8Ústí nad LabemÚstí nad Labem Region9.4
  9. 9PřerovOlomouc Region9.4
  10. 10StudénkaMoravian-Silesian Region9.2
  11. 11OstravaMoravian-Silesian Region9.2
  12. 12Valašské MeziříčíZlín9.1
  13. 13TepliceÚstí nad Labem Region9.0
  14. 14LitvínovÚstí nad Labem Region8.8
  15. 15Český TěšínMoravian-Silesian Region8.6
  16. 16Mladá BoleslavCentral Bohemia8.5
  17. 17Frýdek-MístekMoravian-Silesian Region8.5
  18. 18ZlínZlín8.4
  19. 19PardubicePardubice Region8.3
  20. 20MostÚstí nad Labem Region8.2

+ 10 more cities, the next at 8.1 µg/m³

Not counted on this day, too few days measured: Třinec since 24 Nov 2023, Prague since 21 Nov 2023, Rokycany since 13 Nov 2023 and 3 more cities.

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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.