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 14 Oct 2025: Čaňa 11.8 µg/m³, Šahy 10.4 µg/m³ and Žarnovica 10.3 µg/m³.
- 1ČaňaKošice Region11.8
- 2ŠahyNitra Region10.4
- 3ŽarnovicaBanská Bystrica Region10.3
- 4RevúcaBanská Bystrica Region9.6
- 5LučenecBanská Bystrica Region9.5
- 6PrešovPrešov Region9.2
- 7OščadnicaŽilina Region9.0
- 8ČadcaŽilina Region9.0
- 9PúchovTrenčín Region8.9
- 10BardejovPrešov Region8.8
- 11ŽilinaŽilina Region8.5
- 12KošiceKošice Region8.3
- 13RužomberokŽilina Region8.1
- 14MalackyBratislava Region8.1
- 15MartinŽilina Region8.0
- 16KrompachyKošice Region7.7
- 17TrebišovKošice Region7.6
- 18SenicaTrnava Region7.2
- 19ZvolenBanská Bystrica Region7.1
- 20NitraNitra Region7.1
+ 19 more cities, 7.1 µg/m³ and below
Not counted on this day, too few days measured: Devínska Nová Ves since 8 Oct 2025 and Handlová since 7 Oct 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.