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 Dec 2025: Čaňa 20.6 µg/m³, Vranov nad Topľou 19.6 µg/m³ and Zvolen 15.5 µg/m³.
- 1ČaňaKošice Region20.6
- 2Vranov nad TopľouPrešov Region19.6
- 3ZvolenBanská Bystrica Region15.5
- 4MalackyBratislava Region13.5
- 5NitraNitra Region13.4
- 6Devínska Nová VesBratislava Region12.9
- 7BratislavaBratislava Region12.5
- 8SninaPrešov Region11.3
- 9Veľká LomnicaPrešov Region5.8
Not counted on this day, too few days measured: Poprad since 4 Dec 2025, Žarnovica since 4 Dec 2025, Chorvátsky Grob - Čierna Voda since 4 Dec 2025 and 30 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.