SmogRank / History / City race
Cities in Slovakia, 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 Slovakia for PM2.5 over the 30 days to 28 Jan 2023: Ružomberok 22.6 µg/m³, Spišská Nová Ves 19.3 µg/m³ and Žilina 18.1 µg/m³.
- 1RužomberokŽilina Region22.6
- 2Spišská Nová VesKošice Region19.3
- 3ŽilinaŽilina Region18.1
- 4ZvolenBanská Bystrica Region17.6
- 5PrešovPrešov Region16.0
- 6SenicaTrnava Region15.8
- 7HumennéPrešov Region15.4
- 8MartinŽilina Region15.4
- 9Vranov nad TopľouPrešov Region15.1
- 10KošiceKošice Region15.1
- 11Banská BystricaBanská Bystrica Region14.9
- 12NitraNitra Region14.8
- 13TrnavaTrnava Region14.4
- 14PrievidzaTrenčín Region14.3
- 15TrenčínTrenčín Region14.0
- 16PartizánskeTrenčín Region13.6
- 17Žiar nad HronomBanská Bystrica Region13.2
- 18BratislavaBratislava Region12.6
- 19SninaPrešov Region7.1
Days missing from the source archive fall in this window, so fewer countries are counted.
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.