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 to10 Aug 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 10 Aug 2026: Komárno 15.1 µg/m³, Trnava 14.6 µg/m³ and Trebišov 13.8 µg/m³.

  1. 1KomárnoNitra Region15.1
  2. 2TrnavaTrnava Region14.6
  3. 3TrebišovKošice Region13.8
  4. 4PrešovPrešov Region13.8
  5. 5KošiceKošice Region13.3
  6. 6HumennéPrešov Region12.5
  7. 7SenicaTrnava Region12.5
  8. 8ŽilinaŽilina Region12.4
  9. 9Vranov nad TopľouPrešov Region12.2
  10. 10Chorvátsky Grob - Čierna VodaBratislava Region12.2
  11. 11KrompachyKošice Region12.1
  12. 12PúchovTrenčín Region11.8
  13. 13NitraNitra Region11.8
  14. 14MalackyBratislava Region11.7
  15. 15BardejovPrešov Region11.6
  16. 16SenecBratislava Region11.6
  17. 17SninaPrešov Region11.5
  18. 18PopradPrešov Region11.3
  19. 19SereďTrnava Region11.3
  20. 20MartinŽilina Region11.3

+ 20 more cities, 11.2 µg/m³ and below

Not counted on this day, too few days measured: Čaňa since 5 Aug 2026 and Trenčín since 28 Jun 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.