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 24 Dec 2023: Havířov 28.9 µg/m³, Bohumín 28.6 µg/m³ and Český Těšín 27.0 µg/m³.
- 1HavířovMoravian-Silesian Region28.9
- 2BohumínMoravian-Silesian Region28.6
- 3Český TěšínMoravian-Silesian Region27.0
- 4OstravaMoravian-Silesian Region26.6
- 5Frýdek-MístekMoravian-Silesian Region26.5
- 6DěčínÚstí nad Labem Region24.4
- 7StudénkaMoravian-Silesian Region24.3
- 8Moravská TřebováPardubice Region23.9
- 9Valašské MeziříčíZlín23.5
- 10OpavaMoravian-Silesian Region23.5
- 11TřinecMoravian-Silesian Region22.9
- 12PřerovOlomouc Region22.7
- 13OlomoucOlomouc Region21.3
- 14BerounCentral Bohemia20.6
- 15TepliceÚstí nad Labem Region20.5
- 16MostÚstí nad Labem Region20.0
- 17ZlínZlín19.0
- 18ŽideniceSouth Moravian18.8
- 19SlatinaSouth Moravian18.8
- 20Ústí nad LabemÚstí nad Labem Region18.6
+ 13 more cities, the next at 18.1 µg/m³
Not counted on this day, too few days measured: České Budějovice since 23 Dec 2023 and Rokycany since 13 Nov 2023.
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.