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 Sep 2025: Čaňa 14.5 µg/m³, Humenné 12.4 µg/m³ and Snina 11.9 µg/m³.
- 1ČaňaKošice Region14.5
- 2HumennéPrešov Region12.4
- 3SninaPrešov Region11.9
- 4PrešovPrešov Region11.6
- 5KrompachyKošice Region11.6
- 6BardejovPrešov Region11.6
- 7TrebišovKošice Region11.4
- 8ŽilinaŽilina Region11.4
- 9MartinŽilina Region11.1
- 10KomárnoNitra Region10.9
- 11SenecBratislava Region10.7
- 12LučenecBanská Bystrica Region10.6
- 13KošiceKošice Region10.5
- 14Liptovský Mikulᚎilina Region10.5
- 15PartizánskeTrenčín Region10.4
- 16Vranov nad TopľouPrešov Region10.3
- 17ZvolenBanská Bystrica Region10.3
- 18ŠahyNitra Region10.3
- 19TrnavaTrnava Region10.0
- 20TrenčínTrenčín Region10.0
+ 22 more cities, 10.0 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.