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 27 Jun 2023: Český Těšín 14.6 µg/m³, Havířov 14.4 µg/m³ and Frýdek-Místek 13.7 µg/m³.
- 1Český TěšínMoravian-Silesian Region14.6
- 2HavířovMoravian-Silesian Region14.4
- 3Frýdek-MístekMoravian-Silesian Region13.7
- 4MostÚstí nad Labem Region13.6
- 5BerounCentral Bohemia13.6
- 6KadaňÚstí nad Labem Region13.2
- 7DěčínÚstí nad Labem Region13.1
- 8OstravaMoravian-Silesian Region12.9
- 9OlomoucOlomouc Region12.6
- 10Valašské MeziříčíZlín12.4
- 11StudénkaMoravian-Silesian Region12.4
- 12LitvínovÚstí nad Labem Region12.3
- 13BohumínMoravian-Silesian Region12.3
- 14KladnoCentral Bohemia12.1
- 15PřerovOlomouc Region11.9
- 16Hradec KrálovéHradec Králové Region11.8
- 17PraguePrague11.7
- 18TřinecMoravian-Silesian Region11.6
- 19TepliceÚstí nad Labem Region11.6
- 20PardubicePardubice Region11.5
+ 16 more cities, the next at 11.5 µg/m³
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.