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 Apr 2026 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 9 Apr 2026: Čaňa 23.5 µg/m³, Krompachy 18.3 µg/m³ and Oščadnica 17.4 µg/m³.

  1. 1ČaňaKošice Region23.5
  2. 2KrompachyKošice Region18.3
  3. 3OščadnicaŽilina Region17.4
  4. 4ČadcaŽilina Region17.4
  5. 5PrešovPrešov Region16.8
  6. 6LučenecBanská Bystrica Region16.2
  7. 7HumennéPrešov Region16.0
  8. 8Vranov nad TopľouPrešov Region15.9
  9. 9TrebišovKošice Region15.7
  10. 10RevúcaBanská Bystrica Region15.7
  11. 11ŽarnovicaBanská Bystrica Region15.7
  12. 12RužomberokŽilina Region15.7
  13. 13TrenčínTrenčín Region15.6
  14. 14SninaPrešov Region14.8
  15. 15ŽilinaŽilina Region14.5
  16. 16KošiceKošice Region14.3
  17. 17PúchovTrenčín Region14.3
  18. 18BardejovPrešov Region13.9
  19. 19ŠahyNitra Region13.6
  20. 20PopradPrešov Region13.5

+ 22 more cities, 13.0 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.