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 Nov 2025: Revúca 22.3 µg/m³, Čaňa 18.5 µg/m³ and Žilina 14.5 µg/m³.
- 1RevúcaBanská Bystrica Region22.3
- 2ČaňaKošice Region18.5
- 3ŽilinaŽilina Region14.5
- 4TrebišovKošice Region14.4
- 5Vranov nad TopľouPrešov Region13.8
- 6KošiceKošice Region13.5
- 7HnúšťaBanská Bystrica Region12.7
- 8HumennéPrešov Region12.1
- 9BardejovPrešov Region11.8
- 10NitraNitra Region9.8
- 11BratislavaBratislava Region9.5
- 12Devínska Nová VesBratislava Region9.3
- 13PopradPrešov Region8.2
Not counted on this day, too few days measured: Prešov since 13 Nov 2025, Snina since 7 Nov 2025, Krompachy since 7 Nov 2025 and 25 more cities.
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.