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 9 Oct 2026: Čaňa 12.9 µg/m³, Krompachy 11.9 µg/m³ and Prešov 11.7 µg/m³.
- 1ČaňaKošice Region12.9
- 2KrompachyKošice Region11.9
- 3PrešovPrešov Region11.7
- 4TrebišovKošice Region11.0
- 5Vranov nad TopľouPrešov Region10.4
- 6KošiceKošice Region10.4
- 7HumennéPrešov Region10.2
- 8ZvolenBanská Bystrica Region10.1
- 9TrenčínTrenčín Region10.1
- 10NitraNitra Region10.1
- 11RužomberokŽilina Region10.0
- 12SereďTrnava Region9.9
- 13ŽarnovicaBanská Bystrica Region9.8
- 14MartinŽilina Region9.8
- 15MalackyBratislava Region9.6
- 16RevúcaBanská Bystrica Region9.5
- 17TrnavaTrnava Region9.4
- 18BardejovPrešov Region9.1
- 19Liptovský Mikulᚎilina Region8.9
- 20PartizánskeTrenčín Region8.8
+ 20 more cities, 8.8 µg/m³ and below
Not counted on this day, too few days measured: Lučenec since 27 Sep 2026 and Handlová since 6 Sep 2026.
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.