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 7 Jul 2026: Prešov 14.1 µg/m³, Košice 13.9 µg/m³ and Zvolen 13.5 µg/m³.
- 1PrešovPrešov Region14.1
- 2KošiceKošice Region13.9
- 3ZvolenBanská Bystrica Region13.5
- 4Vranov nad TopľouPrešov Region13.4
- 5TrebišovKošice Region13.4
- 6NitraNitra Region13.4
- 7ČaňaKošice Region13.2
- 8KomárnoNitra Region13.2
- 9HumennéPrešov Region13.1
- 10PopradPrešov Region13.0
- 11BardejovPrešov Region12.9
- 12Chorvátsky Grob - Čierna VodaBratislava Region12.8
- 13ŽilinaŽilina Region12.7
- 14TrnavaTrnava Region12.7
- 15SereďTrnava Region12.7
- 16MartinŽilina Region12.7
- 17MalackyBratislava Region12.7
- 18SninaPrešov Region12.5
- 19SenecBratislava Region12.3
- 20RužomberokŽilina Region12.2
+ 17 more cities, 12.1 µg/m³ and below
Not counted on this day, too few days measured: Kolárovo since 4 Jul 2026, Krompachy since 2 Jul 2026, Banská Bystrica since 29 Jun 2026 and Trenčín since 28 Jun 2026.
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.