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 May 2024: Český Těšín 11.9 µg/m³, Havířov 11.7 µg/m³ and Ostrava 11.5 µg/m³.
- 1Český TěšínMoravian-Silesian Region11.9
- 2HavířovMoravian-Silesian Region11.7
- 3OstravaMoravian-Silesian Region11.5
- 4BohumínMoravian-Silesian Region11.2
- 5KladnoCentral Bohemia10.9
- 6Frýdek-MístekMoravian-Silesian Region10.9
- 7Valašské MeziříčíZlín10.8
- 8NáchodHradec Králové Region10.8
- 9DěčínÚstí nad Labem Region10.8
- 10TřinecMoravian-Silesian Region10.7
- 11StudénkaMoravian-Silesian Region10.7
- 12OlomoucOlomouc Region10.2
- 13OpavaMoravian-Silesian Region10.1
- 14PřerovOlomouc Region9.8
- 15BerounCentral Bohemia9.7
- 16PardubicePardubice Region9.5
- 17Moravská TřebováPardubice Region9.5
- 18PraguePrague9.3
- 19Hradec KrálovéHradec Králové Region9.1
- 20ZnojmoSouth Moravian9.0
+ 18 more cities, 9.0 µg/m³ and below
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.