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 17 Apr 2024: Děčín 16.1 µg/m³, Náchod 15.7 µg/m³ and Český Těšín 15.0 µg/m³.
- 1DěčínÚstí nad Labem Region16.1
- 2NáchodHradec Králové Region15.7
- 3Český TěšínMoravian-Silesian Region15.0
- 4BohumínMoravian-Silesian Region14.7
- 5TřinecMoravian-Silesian Region14.3
- 6OstravaMoravian-Silesian Region13.6
- 7Frýdek-MístekMoravian-Silesian Region13.2
- 8Valašské MeziříčíZlín13.1
- 9StudénkaMoravian-Silesian Region12.9
- 10PřerovOlomouc Region12.8
- 11OpavaMoravian-Silesian Region12.8
- 12KladnoCentral Bohemia12.4
- 13TepliceÚstí nad Labem Region12.0
- 14České BudějoviceSouth Bohemian Region12.0
- 15MostÚstí nad Labem Region11.9
- 16BerounCentral Bohemia11.8
- 17OlomoucOlomouc Region11.7
- 18LitvínovÚstí nad Labem Region11.6
- 19PraguePrague11.5
- 20ZnojmoSouth Moravian11.3
+ 9 more cities, 11.3 µg/m³ and below
Not counted on this day, too few days measured: Zlín since 20 Mar 2024, Pardubice since 20 Mar 2024, Moravská Třebová since 20 Mar 2024 and 6 more cities.
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.