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 15 Aug 2025: Čaňa 14.4 µg/m³, Prešov 12.2 µg/m³ and Trebišov 11.3 µg/m³.
- 1ČaňaKošice Region14.4
- 2PrešovPrešov Region12.2
- 3TrebišovKošice Region11.3
- 4MartinŽilina Region10.9
- 5KrompachyKošice Region10.8
- 6BardejovPrešov Region10.6
- 7Vranov nad TopľouPrešov Region10.5
- 8KošiceKošice Region10.5
- 9TrnavaTrnava Region10.5
- 10KomárnoNitra Region10.4
- 11ZvolenBanská Bystrica Region10.3
- 12ŠahyNitra Region10.2
- 13BratislavaBratislava Region10.2
- 14SninaPrešov Region10.1
- 15SereďTrnava Region10.1
- 16ŽilinaŽilina Region10.0
- 17Liptovský Mikulᚎilina Region9.9
- 18RužomberokŽilina Region9.7
- 19SenecBratislava Region9.6
- 20OščadnicaŽilina Region9.6
+ 21 more cities, 9.6 µg/m³ and below
Not counted on this day, too few days measured: Kolárovo since 17 Jun 2025.
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.