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 Jul 2025: Čaňa 14.6 µg/m³, Prešov 14.2 µg/m³ and Pezinok 12.6 µg/m³.
- 1ČaňaKošice Region14.6
- 2PrešovPrešov Region14.2
- 3PezinokBratislava Region12.6
- 4KrompachyKošice Region12.1
- 5KošiceKošice Region11.4
- 6TrenčínTrenčín Region11.3
- 7SereďTrnava Region11.2
- 8SenecBratislava Region11.2
- 9RevúcaBanská Bystrica Region11.0
- 10Liptovský Mikulᚎilina Region11.0
- 11RužomberokŽilina Region10.9
- 12PúchovTrenčín Region10.9
- 13MalackyBratislava Region10.9
- 14NitraNitra Region10.8
- 15PopradPrešov Region10.6
- 16HumennéPrešov Region10.6
- 17ŽarnovicaBanská Bystrica Region10.6
- 18LučenecBanská Bystrica Region10.6
- 19Žiar nad HronomBanská Bystrica Region10.5
- 20SninaPrešov Region10.4
+ 19 more cities, 10.3 µg/m³ and below
Not counted on this day, too few days measured: Zvolen since 10 Jul 2025, Handlová since 24 Jun 2025 and 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.