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 Feb 2025 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 12 Feb 2025: Šahy 41.8 µg/m³, Revúca 41.6 µg/m³ and Čaňa 33.8 µg/m³.

  1. 1ŠahyNitra Region41.8
  2. 2RevúcaBanská Bystrica Region41.6
  3. 3ČaňaKošice Region33.8
  4. 4ŽarnovicaBanská Bystrica Region32.3
  5. 5RužomberokŽilina Region31.3
  6. 6LučenecBanská Bystrica Region31.1
  7. 7KrompachyKošice Region29.7
  8. 8HnúšťaBanská Bystrica Region28.0
  9. 9PrešovPrešov Region27.6
  10. 10MartinŽilina Region27.6
  11. 11ŽilinaŽilina Region27.2
  12. 12KošiceKošice Region27.0
  13. 13OščadnicaŽilina Region27.0
  14. 14ČadcaŽilina Region27.0
  15. 15Liptovský Mikulᚎilina Region26.6
  16. 16PúchovTrenčín Region26.5
  17. 17ZvolenBanská Bystrica Region23.8
  18. 18TrebišovKošice Region23.6
  19. 19Vranov nad TopľouPrešov Region23.4
  20. 20HumennéPrešov Region22.9

+ 22 more cities, 21.7 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.