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 12 Aug 2025: Čaňa 13.9 µg/m³, Prešov 11.9 µg/m³ and Trebišov 10.9 µg/m³.
- 1ČaňaKošice Region13.9
- 2PrešovPrešov Region11.9
- 3TrebišovKošice Region10.9
- 4BardejovPrešov Region10.4
- 5KošiceKošice Region10.2
- 6TrnavaTrnava Region10.2
- 7MartinŽilina Region10.1
- 8Vranov nad TopľouPrešov Region10.0
- 9KrompachyKošice Region9.9
- 10ZvolenBanská Bystrica Region9.7
- 11ŠahyNitra Region9.6
- 12SereďTrnava Region9.5
- 13Liptovský Mikulᚎilina Region9.5
- 14KomárnoNitra Region9.4
- 15SninaPrešov Region9.3
- 16LučenecBanská Bystrica Region9.3
- 17BratislavaBratislava Region9.3
- 18RužomberokŽilina Region9.1
- 19OščadnicaŽilina Region9.1
- 20ČadcaŽilina Region9.1
+ 21 more cities, 9.0 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 readers for them. Most cities there are missing from this board, not clean. Why.