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 16 Jul 2025: Čaňa 14.5 µg/m³, Prešov 14.3 µg/m³ and Pezinok 12.5 µg/m³.
- 1ČaňaKošice Region14.5
- 2PrešovPrešov Region14.3
- 3PezinokBratislava Region12.5
- 4KrompachyKošice Region11.7
- 5ZvolenBanská Bystrica Region11.7
- 6KošiceKošice Region11.5
- 7SereďTrnava Region11.4
- 8SenecBratislava Region11.4
- 9RevúcaBanská Bystrica Region11.1
- 10TrnavaTrnava Region11.1
- 11TrenčínTrenčín Region11.1
- 12Liptovský Mikulᚎilina Region11.1
- 13RužomberokŽilina Region10.9
- 14LučenecBanská Bystrica Region10.9
- 15HumennéPrešov Region10.8
- 16PúchovTrenčín Region10.8
- 17TrebišovKošice Region10.7
- 18NitraNitra Region10.7
- 19ŽarnovicaBanská Bystrica Region10.6
- 20MalackyBratislava Region10.6
+ 21 more cities, 10.5 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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.