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 19 Apr 2024: Děčín 15.8 µg/m³, Český Těšín 14.6 µg/m³ and Náchod 14.3 µg/m³.
- 1DěčínÚstí nad Labem Region15.8
- 2Český TěšínMoravian-Silesian Region14.6
- 3NáchodHradec Králové Region14.3
- 4BohumínMoravian-Silesian Region14.2
- 5TřinecMoravian-Silesian Region14.0
- 6HavířovMoravian-Silesian Region14.0
- 7OstravaMoravian-Silesian Region13.1
- 8Frýdek-MístekMoravian-Silesian Region12.8
- 9Valašské MeziříčíZlín12.6
- 10PřerovOlomouc Region12.4
- 11StudénkaMoravian-Silesian Region12.3
- 12OpavaMoravian-Silesian Region12.3
- 13Hradec KrálovéHradec Králové Region12.3
- 14Moravská TřebováPardubice Region11.9
- 15KladnoCentral Bohemia11.9
- 16PardubicePardubice Region11.7
- 17TepliceÚstí nad Labem Region11.6
- 18OlomoucOlomouc Region11.5
- 19České BudějoviceSouth Bohemian Region11.5
- 20BerounCentral Bohemia11.4
+ 15 more cities, 11.3 µg/m³ and below
Not counted on this day, too few days measured: Zlín since 20 Mar 2024, Židenice since 18 Mar 2024 and Slatina since 18 Mar 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 readers for them. Most cities there are missing from this board, not clean. Why.