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 22 Sep 2023: Děčín 13.8 µg/m³, Český Těšín 13.8 µg/m³ and Ostrava 13.4 µg/m³.
- 1DěčínÚstí nad Labem Region13.8
- 2Český TěšínMoravian-Silesian Region13.8
- 3OstravaMoravian-Silesian Region13.4
- 4KadaňÚstí nad Labem Region13.4
- 5HavířovMoravian-Silesian Region13.3
- 6OlomoucOlomouc Region13.0
- 7MostÚstí nad Labem Region12.8
- 8BohumínMoravian-Silesian Region12.2
- 9Frýdek-MístekMoravian-Silesian Region12.0
- 10PardubicePardubice Region11.9
- 11PřerovOlomouc Region11.6
- 12OpavaMoravian-Silesian Region11.6
- 13KladnoCentral Bohemia11.6
- 14LitvínovÚstí nad Labem Region11.5
- 15Hradec KrálovéHradec Králové Region11.4
- 16Valašské MeziříčíZlín11.2
- 17TřinecMoravian-Silesian Region11.2
- 18TepliceÚstí nad Labem Region11.1
- 19PraguePrague11.1
- 20StudénkaMoravian-Silesian Region11.0
+ 15 more cities, 10.8 µg/m³ and below
Not counted on this day, too few days measured: Beroun since 15 Sep 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 readers for them. Most cities there are missing from this board, not clean. Why.