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 25 Jan 2023: Ružomberok 22.7 µg/m³, Žilina 17.8 µg/m³ and Zvolen 17.0 µg/m³.
- 1RužomberokŽilina Region22.7
- 2ŽilinaŽilina Region17.8
- 3ZvolenBanská Bystrica Region17.0
- 4Banská BystricaBanská Bystrica Region15.0
- 5SenicaTrnava Region14.9
- 6HumennéPrešov Region14.8
- 7Vranov nad TopľouPrešov Region14.6
- 8MartinŽilina Region14.5
- 9PrievidzaTrenčín Region13.8
- 10TrenčínTrenčín Region13.4
- 11NitraNitra Region13.4
- 12TrnavaTrnava Region13.1
- 13PartizánskeTrenčín Region12.7
- 14Žiar nad HronomBanská Bystrica Region12.0
- 15BratislavaBratislava Region11.5
- 16SninaPrešov Region6.9
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 readers for them. Most cities there are missing from this board, not clean. Why.