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 Jun 2023 That day's board

The worst cities in Czechia for PM2.5 over the 30 days to 24 Jun 2023: Český Těšín 15.1 µg/m³, Havířov 14.9 µg/m³ and Frýdek-Místek 14.3 µg/m³.

  1. 1Český TěšínMoravian-Silesian Region15.1
  2. 2HavířovMoravian-Silesian Region14.9
  3. 3Frýdek-MístekMoravian-Silesian Region14.3
  4. 4MostÚstí nad Labem Region13.7
  5. 5BerounCentral Bohemia13.6
  6. 6OstravaMoravian-Silesian Region13.3
  7. 7KadaňÚstí nad Labem Region13.2
  8. 8DěčínÚstí nad Labem Region13.2
  9. 9Valašské MeziříčíZlín12.7
  10. 10BohumínMoravian-Silesian Region12.7
  11. 11StudénkaMoravian-Silesian Region12.6
  12. 12OlomoucOlomouc Region12.4
  13. 13KladnoCentral Bohemia12.2
  14. 14LitvínovÚstí nad Labem Region12.1
  15. 15PřerovOlomouc Region12.0
  16. 16TřinecMoravian-Silesian Region11.9
  17. 17PraguePrague11.7
  18. 18Hradec KrálovéHradec Králové Region11.7
  19. 19Moravská TřebováPardubice Region11.6
  20. 20LiberecLiberec Region11.6

+ 16 more cities, 11.5 µg/m³ and below

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.