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 13 Jul 2025: Čaňa 14.5 µg/m³, Prešov 14.2 µg/m³ and Pezinok 12.6 µg/m³.
- 1ČaňaKošice Region14.5
- 2PrešovPrešov Region14.2
- 3PezinokBratislava Region12.6
- 4KrompachyKošice Region12.0
- 5ZvolenBanská Bystrica Region11.8
- 6KošiceKošice Region11.4
- 7TrenčínTrenčín Region11.2
- 8SereďTrnava Region11.2
- 9SenecBratislava Region11.2
- 10RevúcaBanská Bystrica Region11.0
- 11Liptovský Mikulᚎilina Region11.0
- 12RužomberokŽilina Region10.8
- 13PúchovTrenčín Region10.8
- 14MalackyBratislava Region10.8
- 15NitraNitra Region10.7
- 16HumennéPrešov Region10.6
- 17ŽarnovicaBanská Bystrica Region10.6
- 18LučenecBanská Bystrica Region10.6
- 19PopradPrešov Region10.5
- 20Žiar nad HronomBanská Bystrica Region10.4
+ 20 more cities, 10.4 µg/m³ and below
Not counted on this day, too few days measured: 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.