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 to14 Apr 2025 That day's board

The worst cities in Slovakia for PM2.5 over the 30 days to 14 Apr 2025: Čaňa 19.3 µg/m³, Šahy 19.1 µg/m³ and Lučenec 18.1 µg/m³.

  1. 1ČaňaKošice Region19.3
  2. 2ŠahyNitra Region19.1
  3. 3LučenecBanská Bystrica Region18.1
  4. 4RevúcaBanská Bystrica Region17.9
  5. 5OščadnicaŽilina Region17.4
  6. 6MartinŽilina Region17.4
  7. 7ČadcaŽilina Region17.4
  8. 8ŽarnovicaBanská Bystrica Region17.3
  9. 9ŽilinaŽilina Region16.5
  10. 10PrešovPrešov Region16.3
  11. 11HumennéPrešov Region16.1
  12. 12PúchovTrenčín Region16.1
  13. 13RužomberokŽilina Region15.3
  14. 14KrompachyKošice Region15.1
  15. 15TrenčínTrenčín Region14.6
  16. 16KošiceKošice Region14.3
  17. 17PezinokBratislava Region14.0
  18. 18Vranov nad TopľouPrešov Region13.9
  19. 19TrebišovKošice Region13.9
  20. 20SenicaTrnava Region13.4

+ 22 more cities, 13.3 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.