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.

CountriesCities
The 30 days to5 Oct 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 5 Oct 2026: Čaňa 11.3 µg/m³, Krompachy 10.2 µg/m³ and Prešov 9.5 µg/m³.

  1. 1ČaňaKošice Region11.3
  2. 2KrompachyKošice Region10.2
  3. 3PrešovPrešov Region9.5
  4. 4SereďTrnava Region9.1
  5. 5TrebišovKošice Region9.0
  6. 6TrenčínTrenčín Region9.0
  7. 7RužomberokŽilina Region9.0
  8. 8NitraNitra Region9.0
  9. 9TrnavaTrnava Region8.9
  10. 10MalackyBratislava Region8.9
  11. 11Vranov nad TopľouPrešov Region8.8
  12. 12KošiceKošice Region8.8
  13. 13ŽarnovicaBanská Bystrica Region8.8
  14. 14SenecBratislava Region8.8
  15. 15HumennéPrešov Region8.6
  16. 16RevúcaBanská Bystrica Region8.5
  17. 17MartinŽilina Region8.5
  18. 18ZvolenBanská Bystrica Region8.3
  19. 19PúchovTrenčín Region8.3
  20. 20BratislavaBratislava Region8.3

+ 20 more cities, 8.1 µg/m³ and below

Not counted on this day, too few days measured: Lučenec since 27 Sep 2026 and Handlová since 6 Sep 2026.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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.