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 21 Aug 2023: Děčín 11.5 µg/m³, Most 10.9 µg/m³ and Český Těšín 10.8 µg/m³.
- 1DěčínÚstí nad Labem Region11.5
- 2MostÚstí nad Labem Region10.9
- 3Český TěšínMoravian-Silesian Region10.8
- 4LitvínovÚstí nad Labem Region10.5
- 5StudénkaMoravian-Silesian Region10.3
- 6OstravaMoravian-Silesian Region10.3
- 7OlomoucOlomouc Region10.3
- 8KadaňÚstí nad Labem Region10.3
- 9HavířovMoravian-Silesian Region10.3
- 10TepliceÚstí nad Labem Region10.1
- 11Moravská TřebováPardubice Region10.0
- 12Hradec KrálovéHradec Králové Region9.9
- 13BohumínMoravian-Silesian Region9.9
- 14PřerovOlomouc Region9.8
- 15Valašské MeziříčíZlín9.7
- 16Frýdek-MístekMoravian-Silesian Region9.7
- 17TřinecMoravian-Silesian Region9.6
- 18ZlínZlín9.2
- 19LiberecLiberec Region9.1
- 20ŽideniceSouth Moravian9.0
+ 10 more cities, 9.0 µg/m³ and below
Not counted on this day, too few days measured: Prague since 7 Aug 2023, Rokycany since 31 Jul 2023, Kroměříž since 31 Jul 2023 and 3 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.