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 23 Aug 2023: Děčín 12.1 µg/m³, Most 11.6 µg/m³ and Český Těšín 11.6 µg/m³.
- 1DěčínÚstí nad Labem Region12.1
- 2MostÚstí nad Labem Region11.6
- 3Český TěšínMoravian-Silesian Region11.6
- 4HavířovMoravian-Silesian Region11.2
- 5StudénkaMoravian-Silesian Region11.1
- 6OstravaMoravian-Silesian Region11.0
- 7OlomoucOlomouc Region11.0
- 8KadaňÚstí nad Labem Region11.0
- 9Frýdek-MístekMoravian-Silesian Region10.9
- 10LitvínovÚstí nad Labem Region10.8
- 11Valašské MeziříčíZlín10.6
- 12Moravská TřebováPardubice Region10.4
- 13TepliceÚstí nad Labem Region10.3
- 14PřerovOlomouc Region10.3
- 15BohumínMoravian-Silesian Region10.3
- 16TřinecMoravian-Silesian Region10.2
- 17Hradec KrálovéHradec Králové Region10.1
- 18ZlínZlín9.8
- 19ŽideniceSouth Moravian9.4
- 20SlatinaSouth Moravian9.4
+ 10 more cities, 9.3 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.