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 to12 Jun 2025 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 12 Jun 2025: Prešov 11.6 µg/m³, Čaňa 11.3 µg/m³ and Krompachy 10.7 µg/m³.

  1. 1PrešovPrešov Region11.6
  2. 2ČaňaKošice Region11.3
  3. 3KrompachyKošice Region10.7
  4. 4PezinokBratislava Region10.5
  5. 5HumennéPrešov Region10.3
  6. 6KošiceKošice Region9.8
  7. 7MartinŽilina Region9.7
  8. 8PopradPrešov Region9.5
  9. 9BardejovPrešov Region9.3
  10. 10ŽarnovicaBanská Bystrica Region9.3
  11. 11LučenecBanská Bystrica Region9.3
  12. 12TrebišovKošice Region9.2
  13. 13TrenčínTrenčín Region9.1
  14. 14ZvolenBanská Bystrica Region8.9
  15. 15SenicaTrnava Region8.9
  16. 16RevúcaBanská Bystrica Region8.8
  17. 17PúchovTrenčín Region8.8
  18. 18KomárnoNitra Region8.7
  19. 19TrnavaTrnava Region8.6
  20. 20BratislavaBratislava Region8.5

+ 21 more cities, 8.4 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.