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 to9 May 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 9 May 2026: Púchov 19.2 µg/m³, Čaňa 18.4 µg/m³ and Krompachy 14.4 µg/m³.

  1. 1PúchovTrenčín Region19.2
  2. 2ČaňaKošice Region18.4
  3. 3KrompachyKošice Region14.4
  4. 4PrešovPrešov Region13.7
  5. 5TrenčínTrenčín Region13.7
  6. 6HumennéPrešov Region13.0
  7. 7RužomberokŽilina Region12.6
  8. 8MartinŽilina Region12.5
  9. 9KošiceKošice Region12.2
  10. 10SenicaTrnava Region11.8
  11. 11KomárnoNitra Region11.7
  12. 12ŽilinaŽilina Region11.6
  13. 13ZvolenBanská Bystrica Region11.5
  14. 14ŽarnovicaBanská Bystrica Region11.5
  15. 15Vranov nad TopľouPrešov Region11.4
  16. 16TrebišovKošice Region11.4
  17. 17MalackyBratislava Region11.3
  18. 18LučenecBanská Bystrica Region11.3
  19. 19BardejovPrešov Region11.2
  20. 20NitraNitra Region11.2

+ 22 more cities, 10.7 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.