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 Sep 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 9 Sep 2026: Čaňa 14.5 µg/m³, Trebišov 11.3 µg/m³ and Humenné 10.7 µg/m³.

  1. 1ČaňaKošice Region14.5
  2. 2TrebišovKošice Region11.3
  3. 3HumennéPrešov Region10.7
  4. 4Vranov nad TopľouPrešov Region10.3
  5. 5PrešovPrešov Region10.2
  6. 6KošiceKošice Region10.1
  7. 7KrompachyKošice Region9.9
  8. 8SenecBratislava Region9.8
  9. 9SninaPrešov Region9.6
  10. 10NitraNitra Region9.4
  11. 11TrnavaTrnava Region9.1
  12. 12BardejovPrešov Region8.8
  13. 13PúchovTrenčín Region8.8
  14. 14KomárnoNitra Region8.8
  15. 15TrenčínTrenčín Region8.7
  16. 16RužomberokŽilina Region8.4
  17. 17PrievidzaTrenčín Region8.4
  18. 18PezinokBratislava Region8.4
  19. 19Chorvátsky Grob - Čierna VodaBratislava Region8.4
  20. 20SenicaTrnava Region8.3

+ 21 more cities, 8.3 µg/m³ and below

Not counted on this day, too few days measured: 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.