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 10 Nov 2025: Revúca 21.8 µg/m³, Čaňa 18.4 µg/m³ and Prešov 15.9 µg/m³.
- 1RevúcaBanská Bystrica Region21.8
- 2ČaňaKošice Region18.4
- 3PrešovPrešov Region15.9
- 4TrebišovKošice Region13.5
- 5KošiceKošice Region12.8
- 6Vranov nad TopľouPrešov Region12.6
- 7HumennéPrešov Region11.2
- 8NitraNitra Region8.8
- 9BratislavaBratislava Region8.5
- 10PopradPrešov Region7.4
Not counted on this day, too few days measured: Snina since 7 Nov 2025, Krompachy since 7 Nov 2025, Trenčín since 7 Nov 2025 and 28 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.