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 18 Jan 2024: Bohumín 28.5 µg/m³, Opava 25.4 µg/m³ and Havířov 24.7 µg/m³.
- 1BohumínMoravian-Silesian Region28.5
- 2OpavaMoravian-Silesian Region25.4
- 3HavířovMoravian-Silesian Region24.7
- 4Frýdek-MístekMoravian-Silesian Region23.0
- 5Moravská TřebováPardubice Region22.0
- 6DěčínÚstí nad Labem Region21.7
- 7PřerovOlomouc Region21.4
- 8OlomoucOlomouc Region21.4
- 9OstravaMoravian-Silesian Region21.1
- 10Valašské MeziříčíZlín20.7
- 11TřinecMoravian-Silesian Region20.3
- 12StudénkaMoravian-Silesian Region19.2
- 13ZlínZlín18.9
- 14Český TěšínMoravian-Silesian Region18.3
- 15KroměřížZlín18.1
- 16MostÚstí nad Labem Region17.1
- 17ZnojmoSouth Moravian16.9
- 18PardubicePardubice Region16.8
- 19ŽideniceSouth Moravian15.8
- 20SlatinaSouth Moravian15.8
+ 9 more cities, 15.8 µg/m³ and below
Not counted on this day, too few days measured: Sokolov since 13 Jan 2024, Beroun since 3 Jan 2024, České Budějovice since 31 Dec 2023 and 2 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.