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 May 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 12 May 2026: Púchov 20.5 µg/m³, Čaňa 17.1 µg/m³ and Krompachy 13.6 µg/m³.

  1. 1PúchovTrenčín Region20.5
  2. 2ČaňaKošice Region17.1
  3. 3KrompachyKošice Region13.6
  4. 4PrešovPrešov Region13.1
  5. 5HumennéPrešov Region12.9
  6. 6TrenčínTrenčín Region12.8
  7. 7MartinŽilina Region11.8
  8. 8KošiceKošice Region11.7
  9. 9RužomberokŽilina Region11.7
  10. 10TrebišovKošice Region11.1
  11. 11KomárnoNitra Region11.1
  12. 12Vranov nad TopľouPrešov Region10.9
  13. 13ZvolenBanská Bystrica Region10.9
  14. 14LučenecBanská Bystrica Region10.9
  15. 15SenicaTrnava Region10.8
  16. 16BardejovPrešov Region10.7
  17. 17ŽilinaŽilina Region10.7
  18. 18NitraNitra Region10.6
  19. 19MalackyBratislava Region10.6
  20. 20ŽarnovicaBanská Bystrica Region10.5

+ 22 more cities, 10.1 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.