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 to8 Jun 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 8 Jun 2026: Čaňa 12.8 µg/m³, Prešov 10.7 µg/m³ and Púchov 10.5 µg/m³.

  1. 1ČaňaKošice Region12.8
  2. 2PrešovPrešov Region10.7
  3. 3PúchovTrenčín Region10.5
  4. 4HumennéPrešov Region10.2
  5. 5KrompachyKošice Region10.1
  6. 6KošiceKošice Region9.5
  7. 7SninaPrešov Region9.3
  8. 8KomárnoNitra Region9.1
  9. 9TrebišovKošice Region9.0
  10. 10BardejovPrešov Region9.0
  11. 11ZvolenBanská Bystrica Region8.7
  12. 12TrenčínTrenčín Region8.7
  13. 13MartinŽilina Region8.7
  14. 14PopradPrešov Region8.6
  15. 15Vranov nad TopľouPrešov Region8.5
  16. 16NitraNitra Region8.5
  17. 17LučenecBanská Bystrica Region8.3
  18. 18SenecBratislava Region8.2
  19. 19ŽilinaŽilina Region8.1
  20. 20Veľká LomnicaPrešov Region8.0

+ 21 more cities, 8.0 µg/m³ and below

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.