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 14 Sep 2025: Čaňa 13.3 µg/m³, Humenné 11.3 µg/m³ and Bardejov 10.9 µg/m³.
- 1ČaňaKošice Region13.3
- 2HumennéPrešov Region11.3
- 3BardejovPrešov Region10.9
- 4PrešovPrešov Region10.7
- 5SninaPrešov Region10.6
- 6TrebišovKošice Region10.4
- 7KrompachyKošice Region10.3
- 8ŽilinaŽilina Region10.3
- 9LučenecBanská Bystrica Region10.1
- 10KomárnoNitra Region10.1
- 11MartinŽilina Region9.9
- 12KošiceKošice Region9.7
- 13SenecBratislava Region9.7
- 14ŠahyNitra Region9.7
- 15Liptovský Mikulᚎilina Region9.6
- 16PartizánskeTrenčín Region9.4
- 17Vranov nad TopľouPrešov Region9.3
- 18ZvolenBanská Bystrica Region9.0
- 19BratislavaBratislava Region9.0
- 20TrnavaTrnava Region8.9
+ 22 more cities, 8.9 µg/m³ and below
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.