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 Nov 2023: Děčín 14.4 µg/m³, Beroun 11.4 µg/m³ and Moravská Třebová 11.1 µg/m³.
- 1DěčínÚstí nad Labem Region14.4
- 2BerounCentral Bohemia11.4
- 3Moravská TřebováPardubice Region11.1
- 4BohumínMoravian-Silesian Region10.6
- 5OlomoucOlomouc Region10.5
- 6HavířovMoravian-Silesian Region10.4
- 7OstravaMoravian-Silesian Region9.7
- 8ZnojmoSouth Moravian9.5
- 9Ústí nad LabemÚstí nad Labem Region9.5
- 10TepliceÚstí nad Labem Region9.3
- 11StudénkaMoravian-Silesian Region9.3
- 12PřerovOlomouc Region9.2
- 13Valašské MeziříčíZlín8.9
- 14LitvínovÚstí nad Labem Region8.9
- 15PardubicePardubice Region8.8
- 16MostÚstí nad Labem Region8.7
- 17Český TěšínMoravian-Silesian Region8.6
- 18Mladá BoleslavCentral Bohemia8.5
- 19Frýdek-MístekMoravian-Silesian Region8.5
- 20ZlínZlín8.1
+ 12 more cities, 8.1 µg/m³ and below
Not counted on this day, too few days measured: Rokycany since 13 Nov 2023, Sokolov since 4 Nov 2023, Kroměříž since 31 Oct 2023 and Kladno since 25 Oct 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.