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.
The worst cities in Czechia for PM2.5 over the 30 days to 18 Dec 2024: Olomouc 15.7 µg/m³, Moravská Třebová 14.6 µg/m³ and Havířov 14.6 µg/m³.
- 1OlomoucOlomouc Region15.7
- 2Moravská TřebováPardubice Region14.6
- 3HavířovMoravian-Silesian Region14.6
- 4NáchodHradec Králové Region14.5
- 5ZnojmoSouth Moravian14.3
- 6PřerovOlomouc Region14.3
- 7OstravaMoravian-Silesian Region14.1
- 8StudénkaMoravian-Silesian Region13.7
- 9DěčínÚstí nad Labem Region13.3
- 10BerounCentral Bohemia13.0
- 11BrnoSouth Moravian12.9
- 12BohumínMoravian-Silesian Region12.6
- 13TepliceÚstí nad Labem Region12.5
- 14LitvínovÚstí nad Labem Region12.4
- 15Hradec KrálovéHradec Králové Region11.9
- 16Frýdek-MístekMoravian-Silesian Region11.7
- 17ZlínZlín11.6
- 18Valašské MeziříčíZlín11.3
- 19MikulovSouth Moravian11.1
- 20ŽideniceSouth Moravian10.9
+ 14 more cities, the next at 10.9 µg/m³
Not counted on this day, too few days measured: Český Těšín since 17 Dec 2024 and Kladno since 16 Dec 2024.
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 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.