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 Nov 2024: Náchod 26.0 µg/m³, Přerov 25.5 µg/m³ and Valašské Meziříčí 24.8 µg/m³.
- 1NáchodHradec Králové Region26.0
- 2PřerovOlomouc Region25.5
- 3Valašské MeziříčíZlín24.8
- 4OlomoucOlomouc Region24.4
- 5Hradec KrálovéHradec Králové Region24.0
- 6Ústí nad LabemÚstí nad Labem Region23.9
- 7ZnojmoSouth Moravian21.9
- 8ZlínZlín20.6
- 9BrnoSouth Moravian20.3
- 10BerounCentral Bohemia19.8
- 11ŽideniceSouth Moravian18.8
- 12SlatinaSouth Moravian18.8
- 13LitvínovÚstí nad Labem Region18.7
- 14MostÚstí nad Labem Region18.4
- 15PilsenPlzeň Region18.3
- 16LiberecLiberec Region17.9
- 17PraguePrague17.8
- 18MikulovSouth Moravian17.7
- 19KladnoCentral Bohemia16.5
- 20České BudějoviceSouth Bohemian Region16.0
+ 2 more cities, the next at 14.6 µg/m³
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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.