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 11 Aug 2025: Čaňa 13.9 µg/m³, Prešov 12.0 µg/m³ and Trebišov 11.0 µg/m³.
- 1ČaňaKošice Region13.9
- 2PrešovPrešov Region12.0
- 3TrebišovKošice Region11.0
- 4BardejovPrešov Region10.5
- 5KošiceKošice Region10.3
- 6TrnavaTrnava Region10.2
- 7Vranov nad TopľouPrešov Region10.0
- 8KrompachyKošice Region9.9
- 9MartinŽilina Region9.9
- 10ZvolenBanská Bystrica Region9.6
- 11SereďTrnava Region9.5
- 12ŠahyNitra Region9.5
- 13Liptovský Mikulᚎilina Region9.5
- 14LučenecBanská Bystrica Region9.2
- 15KomárnoNitra Region9.2
- 16BratislavaBratislava Region9.2
- 17SninaPrešov Region9.1
- 18PopradPrešov Region9.1
- 19RužomberokŽilina Region9.1
- 20RevúcaBanská Bystrica Region9.0
+ 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.