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 6 Oct 2026: Čaňa 11.6 µg/m³, Krompachy 10.5 µg/m³ and Prešov 10.4 µg/m³.
- 1ČaňaKošice Region11.6
- 2KrompachyKošice Region10.5
- 3PrešovPrešov Region10.4
- 4TrebišovKošice Region9.8
- 5SereďTrnava Region9.7
- 6TrenčínTrenčín Region9.6
- 7NitraNitra Region9.6
- 8KošiceKošice Region9.5
- 9RužomberokŽilina Region9.5
- 10Vranov nad TopľouPrešov Region9.4
- 11TrnavaTrnava Region9.4
- 12MalackyBratislava Region9.4
- 13HumennéPrešov Region9.2
- 14MartinŽilina Region9.1
- 15ZvolenBanská Bystrica Region9.0
- 16ŽarnovicaBanská Bystrica Region9.0
- 17SenecBratislava Region8.9
- 18BratislavaBratislava Region8.8
- 19RevúcaBanská Bystrica Region8.6
- 20Liptovský Mikulᚎilina Region8.6
+ 20 more cities, 8.5 µg/m³ and below
Not counted on this day, too few days measured: Lučenec since 27 Sep 2026 and Handlová since 6 Sep 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.